＜＜＜「@」を「__AT__」に置き換えています＞＞＞

From: Pascal Naidon
To: "sg-l__AT__ml.yukawa.kyoto-u.ac.jp" 
Date: Fri, 12 Jun 2020 06:32:02 +0000
Subject: [Sg-l:5034] Seminar June 22nd - Ultracold AMO experiment for quantum few-body and many-body - by Munekazu Horikoshi

Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory is pleased to have Munekazu Horikoshi (Osaka City University) talk about his recent experimental work with ultracold cold gases.
The seminar will be held online on June 22 at 14:00 via Zoom. To join the seminar, simply click on the URL below.

https://zoom.us/j/98324256938?pwd=eGdRUHVHYlhDRHdtY2QrOVBoVVAyZz09
Meeting ID: 983 2425 6938
Password: 978823

--------------------------------------------------------------

SNP and CLUSHIQ seminar

Time & Date: June 22 (Monday), 14:00 - 15:00 (JST)

Speaker: Munekazu Horikoshi (Osaka City University)

Title : Ultracold AMO experiment for quantum few-body and many-body.

Abstract : Ultracold atomic gases can mimic various quantum systems due to their characteristic of short range interactions, dilute density, and tunable interactions using Feshbach resonances. Since they basically show the universal physics which does not depend on detail of particle and the absolute energy scale, we can simulate various quantum systems experimentally, namely quantum simulation. In this seminar, I will introduce recent our cold atom experiments using lithium atoms from basic of the cold atomic system to application to the neutron star equation of state. Also I will show you our recent study toward studying quantum many-body cluster physics.

--------------------------------------------------------------

Best regards,
Pascal Naidon
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
Date: Mon, 22 Jun 2020 14:05:34 +0900
To: Pascal Naidon 
Subject: [Sg-l:5052] Re: Seminar June 22nd - Ultracold AMO experiment for quantum few-body and many-body - by Munekazu Horikoshi

Dear Sg-l members,

For some technical reason we have to change the link of the original zoom room.
The new one is below.   Sorry for the inconvenience for this late notice.

https://zoom.us/j/97922150374?pwd=c21hdGRCUFVyMVNBWHJLNXpLVUgyQT09


-------------------------------------
RCNP, Osaka University
Mihogaoka 10-1, Ibaraki, 567-0047
+81-6-6879-8946

> 2020/06/12 15:32、Pascal Naidon のメール:
>
> Dear all,
>
> As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory is pleased to have Munekazu Horikoshi (Osaka City University) talk about his recent experimental work with ultracold cold gases.
> The seminar will be held online on June 22 at 14:00 via Zoom. To join the seminar, simply click on the URL below.
>
> https://zoom.us/j/98324256938?pwd=eGdRUHVHYlhDRHdtY2QrOVBoVVAyZz09
> Meeting ID: 983 2425 6938
> Password: 978823
>
> --------------------------------------------------------------
>
> SNP and CLUSHIQ seminar
>
> Time & Date: June 22 (Monday), 14:00 - 15:00 (JST)
>
> Speaker: Munekazu Horikoshi (Osaka City University)
>
> Title : Ultracold AMO experiment for quantum few-body and many-body.
>
> Abstract : Ultracold atomic gases can mimic various quantum systems due to their characteristic of short range interactions, dilute density, and tunable interactions using Feshbach resonances. Since they basically show the universal physics which does not depend on detail of particle and the absolute energy scale, we can simulate various quantum systems experimentally, namely quantum simulation. In this seminar, I will introduce recent our cold atom experiments using lithium atoms from basic of the cold atomic system to application to the neutron star equation of state. Also I will show you our recent study toward studying quantum many-body cluster physics.
>
> --------------------------------------------------------------
>
> Best regards,
> Pascal Naidon
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon 
Date: Wed, 24 Jun 2020 18:02:36 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5064] Seminar July 10 by Chris Greene - Linking Efimov physics, few-fermion universality, and the 3n and 4n systems

 Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Chris Greene (Purdue University) talk about his recent
theoretical results on 3-neutron and 4-neutron systems and their links to
Efimov and universal few-body physics.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/ubD6ZGwYJbizTzp9A


Time and date:* Friday July 10, 10:00AM JST*

Speaker:* Chris Greene (Purdue University)*

Title:  *Linking Efimov physics, few-fermion universality, and the 3n and
4n systems*

Abstract:  This seminar will present our recent unpublished results [1]
based on an adiabatic hyperspherical coordinate treatment of the 3-neutron
and 4-neutron systems.  This study finds a totally repulsive hyperradial
potential energy versus the hyperradius, which immediately and visually
makes it clear that there cannot be any low energy resonance in either the
3n or the 4n system.  Our calculations utilize several state of the art
nucleon-nucleon potentials, while also testing the importance of 3-body
nuclear force terms, and multichannel coupling effects.  One major
conclusion is that there is a 1/sqrt(E) zero-energy divergence of the
3-fermion and 4-fermion density of states, which might play a role in
explaining the excess low-energy 4n events in the recent experiment by
Kisamori et al.[2]  This talk will also demonstrate the linkage between the
divergent low energy density of states (or Wigner-Smith time delay), the
Efimov effect, and few-fermion universality.  Additional preliminary
studies of some few-fermion systems occurring in ultracold atomic physics
experiments will also be discussed.

[1] M. D. Higgins, C. H. Greene, A. Kievsky, and M. Viviani,
arXiv:2005.04714 (2020).
[2] K. Kisamori et al., Phys. Rev. Lett. 116, 052501 (2016)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Mon, 6 Jul 2020 08:00:00 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5081] Seminar July 16 by Shin Inouye - Measurement of Electron-to-Proton Mass Ratio

Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Shin Inouye (Osaka City University) talk about his
experimental work on the measurement of the electron-to-proton mass ratio
using ultracold molecules.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/3e9TwK118xwf4SuWA


Time and date: *Thursday July 16, 11:00AM JST*

Speaker: *Shin Inouye (Osaka City University)*

Title:
* Measurement of the Variation of Electron-to-Proton Mass Ratio
UsingUltracold Molecules Produced from Laser-Cooled Atoms*


Abstract:  A rovibrationally pure sample of ultracold KRb molecules was
used to improve the measurement on the stability of electron-to-proton mass
ratio (=C2=A5mu =3D me/Mp). The measurement was based upon a large sensitiv=
ity
coefficient of the molecular spectroscopy, which utilizes a transition
between nearly degenerate pair of vibrational levels each associated with a
different electronic potential. Observed limit on temporal variation of =C2=
=A5mu
was 1/=C2=A5mu d=C2=A5mu/dt=3D(0.30=C2=B11.0)=C3=9710(=E2=88=9214)/year, wh=
ich was better by a factor of
five compared with the most stringent laboratory molecular limits to date.
We also report our effort on trapping ultracold rovibrationally ground
state molecules using a cavity-enhanced optical dipole trap.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Atsushi Hosaka
Date: Mon, 22 Jun 2020 13:46:07 +0900
To: shin_cluster_daibun__AT__mail.nucl.ap.titech.ac.jp
Subject: [Sg-l:5082] Re: [shin_cluster_daibun 00400] Seminar June 22nd - Ultracold AMO experiment for quantum few-body and many-body - by Munekazu Horikoshi

Dear All,

I am sorry but the link that was announced has some trouble.
Could you enter from the one here?
https://zoom.us/j/97922150374?pwd=c21hdGRCUFVyMVNBWHJLNXpLVUgyQT09

I have just one the room.

best regards,
Atsushi
-------------------------------------
RCNP, Osaka University
Mihogaoka 10-1, Ibaraki, 567-0047
+81-6-6879-8946

> 2020/06/12 15:27、Pascal Naidon のメール:
>
> Dear all,
>
> As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory is pleased to have Munekazu Horikoshi (Osaka City University) talk about his recent experimental work with ultracold cold gases.
> The seminar will be held online on June 22 at 14:00 via Zoom. To join the seminar, simply click on the URL below.
>
> https://zoom.us/j/98324256938?pwd=eGdRUHVHYlhDRHdtY2QrOVBoVVAyZz09
> Meeting ID: 983 2425 6938
> Password: 978823
>
> --------------------------------------------------------------
>
> SNP and CLUSHIQ seminar
>
> Time & Date: June 22 (Monday), 14:00 - 15:00 (JST)
>
> Speaker: Munekazu Horikoshi (Osaka City University)
>
> Title : Ultracold AMO experiment for quantum few-body and many-body.
>
> Abstract : Ultracold atomic gases can mimic various quantum systems due to their characteristic of short range interactions, dilute density, and tunable interactions using Feshbach resonances. Since they basically show the universal physics which does not depend on detail of particle and the absolute energy scale, we can simulate various quantum systems experimentally, namely quantum simulation. In this seminar, I will introduce recent our cold atom experiments using lithium atoms from basic of the cold atomic system to application to the neutron star equation of state. Also I will show you our recent study toward studying quantum many-body cluster physics.
>
> --------------------------------------------------------------
>
> Best regards,
> Pascal Naidon
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Fri, 10 Jul 2020 08:52:48 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5086] Fwd: Seminar July 10 by Chris Greene - Linking Efimov physics, few-fermion universality, and the 3n and 4n systems

 Dear all,

This is a reminder of Chris Greene's talk on few-neutron systems starting
today at 10:00am.

Best regards,
Pascal Naidon


---------- Forwarded message ---------
De : Pascal Naidon 
Date: mer. 24 juin 2020 =C3=A0 18:02
Subject: Seminar July 10 by Chris Greene - Linking Efimov physics,
few-fermion universality, and the 3n and 4n systems
To: 


Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Chris Greene (Purdue University) talk about his recent
theoretical results on 3-neutron and 4-neutron systems and their links to
Efimov and universal few-body physics.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/ubD6ZGwYJbizTzp9A


Time and date:* Friday July 10, 10:00AM JST*

Speaker:* Chris Greene (Purdue University)*

Title:  *Linking Efimov physics, few-fermion universality, and the 3n and
4n systems*

Abstract:  This seminar will present our recent unpublished results [1]
based on an adiabatic hyperspherical coordinate treatment of the 3-neutron
and 4-neutron systems.  This study finds a totally repulsive hyperradial
potential energy versus the hyperradius, which immediately and visually
makes it clear that there cannot be any low energy resonance in either the
3n or the 4n system.  Our calculations utilize several state of the art
nucleon-nucleon potentials, while also testing the importance of 3-body
nuclear force terms, and multichannel coupling effects.  One major
conclusion is that there is a 1/sqrt(E) zero-energy divergence of the
3-fermion and 4-fermion density of states, which might play a role in
explaining the excess low-energy 4n events in the recent experiment by
Kisamori et al.[2]  This talk will also demonstrate the linkage between the
divergent low energy density of states (or Wigner-Smith time delay), the
Efimov effect, and few-fermion universality.  Additional preliminary
studies of some few-fermion systems occurring in ultracold atomic physics
experiments will also be discussed.

[1] M. D. Higgins, C. H. Greene, A. Kievsky, and M. Viviani,
arXiv:2005.04714 (2020).
[2] K. Kisamori et al., Phys. Rev. Lett. 116, 052501 (2016)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Tue, 25 Aug 2020 14:14:00 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5161] Seminar Sept 3rd by Peng Zhang - Laser control of two-body processes in nuclear and cold-atom systems

 Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Peng Zhang (Renmin University, Beijing) talk about his
recent theoretical works on laser control of two-body processes in nuclear
and cold-atom systems.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/NMNa8ijQbKvfBxgu8

Time and date:
*Thursday September 3rd, 14:00 JST*
Speaker:
* Peng Zhang (Renmin University, Beijing)*
Title:
* Laser control of two-body processes in nuclear and cold-atom systems*
Abstract:

In this talk I will introduce two of our recent works.

 (1) Laser control of low-energy neutron-proton collisions. Recently the
control of nuclear processes with strong laser  (power density
10^19-10^22W/cm^2) has attracted a lot of attention. In this work we study
the low-energy elastic and inelastic scattering between neutron and proton
in such a strong laser, and find that in such a system there can be
extremely strong multi-photon absorption effect (i.e., the inverse
bremsstrahlung effect). In some cases the neutron and proton may absorb
 10^4-10^5 photons in one collision.  In addition, the inelastic scattering
(absorption) rate can also be manipulated by the laser.


 (2) Molecular electric dipole moment of alkaline-earth (like) atoms in 1S0
and 3P0 states. We study the molecule states of two alkaline-earth (like)
atoms in 1S0 and 3P0 states respectively, and show that there is an
inter-orbit electric transition dipole moment between two such states in
spin singlet and triplet manifolds. For two Yb173 atoms the peak value of
this electric dipole close to one Debye for Yb173 atoms. With such a dipole
moment one can dress these two molecule states with electric-dipole
transition induced by, e.g., a microwave, and form a dressed ``dipolar"
molecule.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Tue, 1 Sep 2020 09:55:10 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5173] Seminar Sept 9th by Hans-W. Hammer - The lifetime of the hypertriton

 Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Hans-Werner Hammer (TU Darmstadt) talk about his recent
theoretical work on the lifetime of the hypertriton.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/1vfGYYHvC6XuxaKJA

Time and date: *Wednesday September 9th, 16:00 JST*
Speaker:* Hans-Werner Hammer (TU Darmstadt)*
Title:  *The lifetime of the hypertriton*

Abstract:

  We investigate the lifetime of the hypertriton as a function of the
Lambda separation energy B_Lambda in an effective field theory with Lambda
and deuteron degrees of freedom. We also consider the impact of new
measurements of the weak decay parameter of the Lambda. While the
sensitivity of the total width to B_Lambda is small, the partial widths for
decays into individual final states and the experimentally measured ratio
R=Γ_3He/(Γ_3He+Γ_pd) show a strong dependence. We comment on recent
measurements of hypertriton properties in heavy ion collisions.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Thu, 3 Sep 2020 11:06:53 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5182] Fwd: Seminar Sept 3rd by Peng Zhang - Laser control of two-body processes in nuclear and cold-atom systems

Dear all,
This is a reminder of today's seminar at 14:00 on laser control of two-body
processes in nuclear and cold-atom systems.
Best regards,
Pascal Naidon

---------- Forwarded message ---------
De : Pascal Naidon 
Date: mar. 25 ao=C3=BBt 2020 =C3=A0 14:14
Subject: Seminar Sept 3rd by Peng Zhang - Laser control of two-body
processes in nuclear and cold-atom systems
To: 


Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Peng Zhang (Renmin University, Beijing) talk about his
recent theoretical works on laser control of two-body processes in nuclear
and cold-atom systems.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/NMNa8ijQbKvfBxgu8

Time and date:
*Thursday September 3rd, 14:00 JST*
Speaker:
* Peng Zhang (Renmin University, Beijing)*
Title:
* Laser control of two-body processes in nuclear and cold-atom systems*
Abstract:

In this talk I will introduce two of our recent works.

 (1) Laser control of low-energy neutron-proton collisions. Recently the
control of nuclear processes with strong laser  (power density
10^19-10^22W/cm^2) has attracted a lot of attention. In this work we study
the low-energy elastic and inelastic scattering between neutron and proton
in such a strong laser, and find that in such a system there can be
extremely strong multi-photon absorption effect (i.e., the inverse
bremsstrahlung effect). In some cases the neutron and proton may absorb
 10^4-10^5 photons in one collision.  In addition, the inelastic scattering
(absorption) rate can also be manipulated by the laser.


 (2) Molecular electric dipole moment of alkaline-earth (like) atoms in 1S0
and 3P0 states. We study the molecule states of two alkaline-earth (like)
atoms in 1S0 and 3P0 states respectively, and show that there is an
inter-orbit electric transition dipole moment between two such states in
spin singlet and triplet manifolds. For two Yb173 atoms the peak value of
this electric dipole close to one Debye for Yb173 atoms. With such a dipole
moment one can dress these two molecule states with electric-dipole
transition induced by, e.g., a microwave, and form a dressed ``dipolar”
molecule.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Wed, 9 Sep 2020 09:23:15 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5195] Fwd: Seminar Sept 9th by Hans-W. Hammer - The lifetime of the hypertriton

Dear all,

This is a reminder of today's seminar on the lifetime of the hypertriton at
16:00 JST.

Best regards,
Pascal Naidon

---------- Forwarded message ---------
De : Pascal Naidon 
Date: mar. 1 sept. 2020 à 09:55
Subject: Seminar Sept 9th by Hans-W. Hammer - The lifetime of the
hypertriton
To: 


Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Hans-Werner Hammer (TU Darmstadt) talk about his recent
theoretical work on the lifetime of the hypertriton.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/1vfGYYHvC6XuxaKJA

Time and date: *Wednesday September 9th, 16:00 JST*
Speaker:* Hans-Werner Hammer (TU Darmstadt)*
Title:  *The lifetime of the hypertriton*

Abstract:

  We investigate the lifetime of the hypertriton as a function of the
Lambda separation energy B_Lambda in an effective field theory with Lambda
and deuteron degrees of freedom. We also consider the impact of new
measurements of the weak decay parameter of the Lambda. While the
sensitivity of the total width to B_Lambda is small, the partial widths for
decays into individual final states and the experimentally measured ratio
R=Γ_3He/(Γ_3He+Γ_pd) show a strong dependence. We comment on recent
measurements of hypertriton properties in heavy ion collisions.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Wed, 16 Sep 2020 13:37:52 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5216] Seminar on 9/28 by Tetsuo Hyodo - Lambda(1405) as a hadronic molecule

Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Tetsuo Hyodo (Tokyo Metropolitan University) talk about
his recent theoretical work on Lambda(1405) as a hadronic molecule.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/LE6myFPRbngRRqEF8


Time and date: *Monday September 28th, 13:00 JST*
Speaker: *Tetsuo Hyodo (Tokyo Metropolitan University)*
Title: *Lambda(1405) as a hadronic molecule*

Abstract:

Hadronic molecules are the new form of matter induced by the strong
interaction.
However, identification of the hadronic molecules involves several subtle
difficulties such as the model dependence and the interpretation of the
resonance wave function. To overcome these difficulties, we use the
compositeness to characterize the internal structure of hadrons, and
generalize the weak-binding relation for unstable resonances. It is
quantitatively shown that the structure of the $\Lambda(1405)$ resonance is
dominated by the molecular state of an antikaon and a nucleon.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Wed, 7 Oct 2020 11:28:41 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5256] SNP seminar Oct 14th on hyperon halo nuclei, and neutron stars - by Y. Zhang and J. Hu

Dear all,

SNP laboratory visiting members Ying Zhang and Jinniu Hu will give farewell
seminars on October 14th.

The seminars will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/UBvHyav4i3ji9QyTA


Time and date: *Wednesday October 14th, 14:00 JST*
Speaker: *Ying Zhang *(Tianjin University and RIKEN)
Title: *Lambda halo structure of C, B and Zr isotopes*

Abstract: The halo nuclei are characterized by its extended density profile
far beyond the nuclear surface region [1-3]. Very much enhanced electric
dipole transitions have been also observed in several halo nuclei as a
unique phenomenon associated with the extended halo wave function [4].  For
hypernuclei consisting nuclei and a Lambda hyperon, there is also
possibility to have Lambda halo states in lighter systems [5,6].  In this
work, we study the Lambda hypernuclei of C, B [7] and Zr isotopes by
Hartree-Fock and Hartree-Fock-Bogoliubov model with Skyrme-type
nucleon-nucleon and nucleon-hyperon interactions. The calculated binding
energies agree well with the available experiment data for C and B
hypernuclei. We found halo structures with extended wave function beyond
the nuclear surface in the Lambda 1p-state in the light C and B isotopes.
We also found the enhanced electric dipole transition between 1p- and
1s-Lambda states, which could be the evidence for this hyperon halo
structure.  The Lambda hyperon in the Zr isotopes which were predicted to
have giant neutron halo, has more halo orbits near the threshold, such as
3s-, 2d-, and 1g-states.  They are almost degenerate.   Especially, the
3s-state could have even more extended wave function than that of the giant
neutron halo.

[1] I. Tanihata, et al., Phys. Rev. Lett. 55, 2676 (1985).
[2] B. Jonson, Phys. Rep. 389, 1(2004).
[3] J. Meng and S. G. Zhou, J. Phys. G 42, 093101 (2015).
[4] T. Nakamura et al., Phys. Rev. Lett. 96, 252502 (2006).
[5] K. Miyagawa, H. Kamada, W. Glockle, and V. Stoks, Phys. Rev. C 51, 2905
(1995).
[6] E. Hiyama, M. Kamimura, T. Motoba, T. Yamada, and Y. Yamamoto, Phys.
Rev. C 53, 2075 (1996).
[7] Y. Zhang, H. Sagawa, E. Hiyama,  arXiv:2009.13196 [nucl-th]



Time and date: *Wednesday October 14th, 14:45 JST*
Speaker: *Jinniu Hu* (Nankai University and RIKEN)
Title: *The mass limit of a neutron star*

Abstract: The rapid progresses of the astronomical observable techniques
provide not only great challenges but also many opportunities in the
investigations of neutron star. In the past decade, the measurements of
massive neutron stars above $2.0M_\odot$ successively broke through our
recognition of their maximum masses. In 2019, a compact object was observed
with a mass of $2.50-2.67~M_\odot$ by LIGO Scientific and Virgo
collaborations (LVC) in GW19081. In this talk, I will show our results
about properties of neutron star, including its mass, radius, tidal
deformabilities, and so on with different density functional theories and
ab initio methods obtained during the past year, when I visited SNP
laboratory. We found these theoretical frameworks can describe various
constraints of neutron star from the massive neutron star observations, the
mass-radius simultaneous measurements (NICER), and gravitational wave
detections. The maximum masses of neutron star, composed of pure hadron
matter can be around $2.55M_\odot$, the dimensionless tidal deformabilities
at $1.4M_\odot$ are less than $800$, and the radius of $1.4M_\odot$ are
smaller than $13.0$ km.

[1] Y. Zhang, P. Liu, and J. Hu, Int. J. Mod. Phys. E, 28, 1950094 (2019)
[2] J. Hu, S. Bao, Y. Zhang, K. Nakazato, K. Sumiyoshi, and H. Shen, Prog.
Theo. Exp. Phys., 2020, 043D01 (2020)
[3] C. Wang, J. Hu, Y. Zhang, and H. Shen, Astrophys. J., 897, 96 (2020).
[4] K. Huang, J. Hu, Y. Zhang, and H. Shen, Astrophys. J., in press, arXiv:
2008.04491
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Tue, 20 Oct 2020 16:46:58 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5297] Seminar Oct 27th by Servaas Kokkelmans - Elastic few-body interactions in dilute Bose gases

Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Servaas Kokkelmans (Eindhoven University of Technology)
talk about his recent theoretical work on elastic few-body interactions in
dilute Bose gases.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/bR1L6Qb9xXfdYDFs9


Time and date: Tuesday *September 27th*, 16:00 Japan time (9:00 European
time)

Speaker:* Servaas Kokkelmans* (Eindhoven University of Technology)

Title:
*Elastic few-body interactions in dilute Bose gases*
Abstract:

The elastic scattering properties of three bosons at low energy enter the
many-body description of ultracold Bose gases via the three-body scattering
hypervolume D. We study this quantity for identical bosons that interact
via a pairwise finite-range potential, and are able to cover the full
regime from weak to strong two-body interactions. While universal behaviour
for large two-body scattering lengths is expected, we also find universal
behaviour of the real part of D in the weakly interacting regime. We use
this result to make quantitative predictions for the thermodynamics and
elementary excitations of an atomic Bose-Einstein condensate in the
vicinity of a quantum tricritical point, including quantum droplets
stabilized by effective three-body interactions. Furthermore, I will
discuss a cumulant theory of the unitary Bose gas, which is able to capture
prethermal and Efimovian dynamics when quenching a degenerate ultracold
Bose gas to the unitary regime.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Tue, 27 Oct 2020 10:09:18 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5325] Fwd: Seminar Oct 27th by Servaas Kokkelmans - Elastic few-body interactions in dilute Bose gases

 Dear all,

Please note that today's seminar by Servaas Kokkelmans on Elastic few-body
interactions in dilute Bose gases
will be held from *17:00* Japan time.

Best regards,
Pascal Naidon

---------- Forwarded message ---------
De : Pascal Naidon 
Date: mar. 20 oct. 2020 =C3=A0 16:46
Subject: Seminar Oct 27th by Servaas Kokkelmans - Elastic few-body
interactions in dilute Bose gases
To: 


Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Servaas Kokkelmans (Eindhoven University of Technology)
talk about his recent theoretical work on elastic few-body interactions in
dilute Bose gases.

The seminar will be held online via Zoom. To join the seminar, please
register at any time by clicking the following link to obtain the Zoom ID
and password.
https://forms.gle/bR1L6Qb9xXfdYDFs9


Time and date: Tuesday *September 27th*, 16:00 Japan time (9:00 European
time)

Speaker:* Servaas Kokkelmans* (Eindhoven University of Technology)

Title:
*Elastic few-body interactions in dilute Bose gases*
Abstract:

The elastic scattering properties of three bosons at low energy enter the
many-body description of ultracold Bose gases via the three-body scattering
hypervolume D. We study this quantity for identical bosons that interact
via a pairwise finite-range potential, and are able to cover the full
regime from weak to strong two-body interactions. While universal behaviour
for large two-body scattering lengths is expected, we also find universal
behaviour of the real part of D in the weakly interacting regime. We use
this result to make quantitative predictions for the thermodynamics and
elementary excitations of an atomic Bose-Einstein condensate in the
vicinity of a quantum tricritical point, including quantum droplets
stabilized by effective three-body interactions. Furthermore, I will
discuss a cumulant theory of the unitary Bose gas, which is able to capture
prethermal and Efimovian dynamics when quenching a degenerate ultracold
Bose gas to the unitary regime.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Mon, 9 Nov 2020 14:42:08 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5372] Seminar Nov 26th by Shun Uchino - Atomtronics

 Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Shun Uchino (JAEA) talk about "Atomtronics".

Time and date: Thursday *November 26th, 14:00* Japan time
Speaker: *Shun Uchino (JAEA)*
Title:  *Atomtronics*

Abstract:

Ultracold atomic gases allow us to simulate bare essentials of complicated
quantum phenomena. Recently, atomtronics, which is the cold-atom analog of
electronics, has attracted attention due to experimental realization of
mesoscopic and circuit systems with ultracold atomic gases. In this
seminar, I will focus on mesoscopic transport phenomena realized by
two-terminal experiments with ultracold atomic gases, and demonstrate that
novel transport phenomena, which have yet to be discussed in other fields,
can be realized with atomtronic devices.


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars you will receive the Zoom ID and password by e-mail before the
seminar starts. If not, you can get this information at any time following
this link:
http://snp.riken.jp/seminar.html#2020-11-26
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Tue, 1 Dec 2020 10:05:26 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5434] Seminar Dec 11th by Shin Inouye - Measurement of the Variation of Electron-to-Proton Mass Ratio Using Ultracold Molecules Produced from Laser-Cooled Atoms

Dear all,

The RIKEN SNP online seminar by Shin Inouye (Osaka City University) on the
electron-to-proton mass ratio, originally scheduled to July 16th, will be
held on Dec 11th.

Time and date: Friday *December 11th, 15:00* Japan time
Speaker: *Shin Inouye* (Osaka City University)
Title:  *Measurement of the Variation of Electron-to-Proton Mass Ratio
Using Ultracold Molecules Produced from Laser-Cooled Atoms*

Abstract:

A rovibrationally pure sample of ultracold KRb molecules was used to
improve the measurement on the stability of electron-to-proton mass
ratio (¥mu = me/Mp). The measurement was based upon a large sensitivity
coefficient of the molecular spectroscopy, which utilizes
a transition between nearly degenerate pair of vibrational levels each
associated with a different electronic potential. Observed limit on
temporal variation of ¥mu was 1/¥mu d¥mu/dt=(0.30±1.0)×10(−14)/year, which
was better by a factor of five compared with the most stringent laboratory
molecular limits to date.


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars (or if you already registered to this seminar in July) you will
receive the Zoom ID and password by e-mail before the seminar starts. If
not, you can get this information at any time following this link:
http://snp.riken.jp/seminar.html#2020-12-11
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Fri, 8 Jan 2021 16:27:15 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5529] Seminar Jan 22nd by Tokuro Fukui - Many-body effective models with chiral interaction

 Dear all,

As part of the Quantum Cluster Project (CLUSHIQ), the RIKEN SNP laboratory
is pleased to have Tokuro Fukui (Kyoto University) talk about "Many-body
effective models with chiral interaction".

Time and date: *Friday January 22nd, 14:00* Japan time
Speaker: *Tokuro Fukui* (Kyoto University)
Title:  *Many-body effective models with chiral interaction*

Abstract:

In the first part of the seminar, we show an evolution to derive the
effective Hamiltonian in the shell-model framework starting from two- and
three-body interactions based on the chiral effective field theory. Then we
discuss the contribution of the three-body force in the p- and pf-shell
nuclei, the possible neutron dripline of the Ca isotopes, and the interplay
between the three-body force and continuum states in the oxygen isotopes.
The second part of the seminar is devoted to our latest study towards
constructing the realistic cluster model with chiral interaction. At the
moment, although we adopt a phenomenological way to derive the effective
Hamiltonian relevant to the cluster model, we can address the individual
contributions of the pion-exchange forces. Thus, we verify possible sources
of the attraction between alpha particles in 8Be.


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars you will receive the Zoom ID and password by e-mail before the
seminar starts. If not, you can get this information at any time following
this link:
http://snp.riken.jp/seminar.html#2021-01-22
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Fri, 12 Feb 2021 13:37:54 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5602] Seminar Feb 24 by Shimpei Endo - Are atoms spherical?

 Dear all,

The next seminar of the RIKEN SNP laboratory will be given by Shimpei Endo
(Tohoku University).

Time and date: Wednesday *February 24th*, 2021 14:00 Japan time
Speaker: *Shimpei Endo (Tohoku University)*
Title:  *Are atoms spherical?*

Abstract:

In nuclear physics, it is widely known that the atomic nuclei can be
spontaneously deformed into various non-spherical shapes due to many-body
effects of protons and neutrons. We discuss to what extent a similar
deformation takes place in atoms, a system of many electrons and a central
nuclei. Firstly, we numerically show that the atoms are rather spherical,
in stark contrast to the nuclei: electron distribution in various atoms are
found either strictly spherical or deformed only in the surface region due
via the single-particle valence orbitals. This is in contrast to atomic
nuclei, which can be deformed collectively. Secondly we show that the
origin for this apparent difference can be elegantly explained by a
qualitative model which estimates the energy change due to deformation. We
find that the nature of the interaction plays an essential role for the
collective deformation.

T. Naito, S. Endo, K. Hagino, Y. Tanimura, arXiv:2009.05955


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars you will receive the Zoom ID and password by e-mail on the day of
the seminar. If not, you can get this information at any time following
this link:
http://snp.riken.jp/seminar.html#2021-02-24
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Mon, 15 Feb 2021 08:30:00 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5606] Seminar Feb 25 by Yusuke Tanimura - How to visualize nuclear many-body correlations?

 Dear all,

Yusuke Tanimura (Tohoku University) will give a seminar at the RIKEN SNP
laboratory.

Time and date: Thursday *February 25th, 2021* 14:00 Japan time
Speaker: *Yusuke Tanimura (Tohoku University)*
Title:  *How to visualize nuclear many-body correlations?*

Abstract:

The many-body wave function contains an enormous amount of information
since it is a complex function of as many variables as the number of
particles. Therefore, it is in general difficult to make use of all the
information of a wave function obtained with a theory. Recently, in the
field of quantum chemistry, a method to visualize the correlations among
all the electrons in a system have been developed and applied to studies of
molecular structures [1].
It would be interesting to apply such a method also to nuclear structure.
As the first step, we employ a simpler method than the one in Ref. [1]: we
simply search for the most probable spatial configuration of nucleons,
i.e., the set of coordinates that maximizes the square of the wave
function. With this method, we visualize the N-body correlation of N-body
system, using the full information of a many-body wave function. We apply
the method to analyses of cluster correlations in light nuclei. We use wave
function given by the Hartree-Fock (HF) theory. We show that the HF wave
function indeed contains some alpha-cluster-like correlation.

[1] Yu Liu, Terry J. Frankcombe, and Timothy W. Schmidt, Phys. Chem. Chem.
Phys. 18, 13385 (2016).


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars you will receive the Zoom ID and password by e-mail on the day of
the seminar. If not, you can get this information at any time following
this link:
http://snp.riken.jp/seminar.html#2021-02-25
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
From: Pascal Naidon
Date: Thu, 25 Feb 2021 13:51:58 +0900
To: sg-l__AT__ml.yukawa.kyoto-u.ac.jp
Subject: [Sg-l:5618] Seminar March 25th by Yifei Niu - Beyond Mean-field Description of Nuclear Weak Interaction Processes in Stars

 Dear all,

The next seminar of the RIKEN SNP laboratory will be given by Yifei Niu
(Lanzhou University).

Time and date: Thursday *March 25th, 2021* *11:00 *Japan time
Speaker:  *Yifei Niu (Lanzhou University)*
Title:   *Beyond Mean-field Description of Nuclear Weak Interaction
Processes in Stars*

Abstract:
  How were the heavy elements from iron to uranium made is one of 11
greatest unanswered questions of physics. Half of these heavy elements were
made by the so-called r-process, the study of which faces two challenges:
the accurate nuclear physics inputs, such as the nuclear mass and
beta-decay half-lives, as well as the r-process sites, which could be the
core-collapse supernova and neutron-star mergers.
In this seminar, I will introduce the self-consistent calculations for the
beta-decay half-lives as inputs for the r-process study, and stellar
electron-capture rates as inputs for supernova simulations. The model
beyond quasiparticle random phase approximation (QRPA), which includes
quasiparticle vibration coupling (QPVC) effect, is developed for the
calculation of beta-decay half-lives, which greatly improves the agreement
with experimental data compared to QRPA model. The interplay between
isoscalar pairing and QPVC effect on beta-decay half-lives is studied. The
finite-temperature RPA model is applied for the study of electron-capture
rates of important nuclei for supernova simulations, and the role of
forbidden transitions are addressed.


The seminar will be held online via Zoom. If you are a subscriber of SNP
seminars you will receive the Zoom ID and password by e-mail on the day of
the seminar. If not, you can get this information at any time following
this link:
http://snp.riken.jp/seminar.html#2021-03-25