Bulletin of the American Physical Society
3rd Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 54, Number 10
Tuesday–Saturday, October 13–17, 2009; Waikoloa, Hawaii
Session 1WA: Workshop on Physics of Exotic Nuclei |
Hide Abstracts |
Chair: Baha Balantekin, University of Wisconsin Room: Kohala 1 |
Tuesday, October 13, 2009 9:00AM - 9:30AM |
1WA.00001: Japan-US collaboration in Nuclear Physics Invited Speaker: I will mention some highlights from the history of Japan-US collaboration in Nuclear Physics. Although I have memories of my personal strong ties with many friends in US, I shall rather skip them, and focus on three major collaborative works which have made significant impacts on the developments of nuclear physics. The first one is the INS (Institute for Nuclear Study, University of Tokyo) - Berkeley collaboration. As well known, this led to the beginning of Rare Isotope (RI) beam experiments as a global trend and consequently the discovery of neutron halo by Tanihata et al. This Berkeley experiment was inspired by the Japanese Numatron project, which has remained only a plan. The second one would be RHIC. The RHIC is probably one of the most successful products of the INS- Berkeley project at least conceptually. Nagamiya has led US efforts over years, which has produced QGP finally, while he has moved back to Japan before this moment. The third point I would like to mention is the RIKEN Brookhaven Center. This has been supported by T.D. Lee strongly, and has contributed to the developments of spin physics, QGP experiments, Lattice QCD calculation. It also encouraged US young theoreticians by the supportive program with US universities. I now see many active physicists who were under this program. Now we have JUSTIPEN (Japan-US Theory Institute of Physics with Exotic Nuclei) program by DOE through the University of Tennessee. Since the summer of 2007, over fifty physicists including experimentalists have come to Japan for theoretical studies, and many workshops have been organized. Thanks also to its Japanese matching fund EFES(International Research Network on Exotic Femto Systems), a large number of Japanese physicists visited US, having many workshops and collaborations. At the era of RIBF completion and FRIB initialization, the Japan-US collaboration becomes of more significance, and I hope that this workshop and the joint meeting this week will accelerate the developments of this frontier field of physics. [Preview Abstract] |
Tuesday, October 13, 2009 9:30AM - 10:00AM |
1WA.00002: JUSTIPEN: Science in the international context Invited Speaker: Physicists seek to understand nuclei through creating an experimental capability to investigate neutron rich nuclei and to utilize experimental data to validate a theoretical framework for describing all nuclei, including those produced in violent stellar deaths. Experimental efforts in Japan with the Radioactive Isotope Beam Factory (RIBF), and with the future Facility for Antiproton and Ion Research (FAIR) in Germany, and the future Facility for Rare Isotope Beams to be built at Michigan State University, along with existing facilities at Oak Ridge, Argonne, and other institutions, will be complemented by theoretical advances that focus on physics with exotic nuclei. The Japan Institute for Theoretical Physics with Exotic Nuclei (JUSTIPEN) was established between U.S. and Japanese scientists to facilitate theoretical investigations of exotic nuclei in the context of world-wide experimental efforts. Hosted by RIKEN and the University of Tokyo, JUSTIPEN is located at the RIBF facility at RIKEN with support coming from the Japan Society for the Promotion of Science and from the Department of Energy Office of Science, Office of Nuclear Physics. In this talk, I will describe the general physics thrusts of JUSTIPEN and its continuing program. [Preview Abstract] |
Tuesday, October 13, 2009 10:00AM - 10:30AM |
1WA.00003: Neutrinos in Nuclear Physics and Astrophysics and Japan-US Collaboration Invited Speaker: Neutrino is a tiny weakly interacting particle but plays several important and essential roles in nuclear physics, astrophysics and cosmology. Cosmological neutrinos take one of the keys to the formation of large scale structure and CMB anisotropies. Supernova neutrinos play critical roles in gravitational core-collapse and explosion of massive stars and also in explosive nucleosynthesis of light-to-heavy mass nuclei. In addition to these astrophysical interests, recent focus in neutrino physics is on the effects of flavor oscillation and self-interaction which indicate nature of fundamental symmetry or its breaking. Since these effects manifest themselves clearly through neutrino and matter interactions (i.e. neutrino-electron, -nucleon and -nucleus interactions), it is important to study the nuclear response to weak-electromagnetism. It is even more important to study the electroweak interaction as well as strong interaction in short-lived unstable nuclei because almost all catastrophic astrophysical phenomena occur on extreme conditions to be associated with frequent production and destruction of these exotic nuclei. Several Japan-US collaborations are underway on these topics in nuclear astrophysics. In this talk we will discuss several aspects of neutrinos in nuclear physics and astrophysics based on these collaborations. [Preview Abstract] |
Tuesday, October 13, 2009 10:30AM - 11:00AM |
1WA.00004: COFFEE BREAK
|
Tuesday, October 13, 2009 11:00AM - 11:30AM |
1WA.00005: Extending the No-core Shell Model to heavier nuclei Invited Speaker: The No-Core Shell Model (NCSM) has had considerable success in describing the binding energies, excitation spectra and other physical properties of light nuclei, $A \leq 16$, {\it e.g.,} [1]. The big challenge facing future NCSM investigations is how to perform such calculations for heavier nuclei, for which the model spaces become unmanageable with existing computers. Our current studies involve the development of new many-body approaches for achieving this goal, such as the idea of successive unitary transformations, so as to include the effects of {\it all} nucleons, as proposed by Navr\'atil, {\it et al.}[2]. We construct effective one-body, two-body and three-body interactions for the $p$-shell by performing $N_{max}\hbar\Omega$ {\it ab initio} NCSM calculations for $A=5$, $A=6$ and $A=7$ nuclei, respectively, with $N_{max} = 2, 4, ...,12$ and projecting the many-body Hamiltonians onto the $0\hbar\Omega$ space. We show how the averaged many-body correlations modify the $p$-shell two-body Hamiltonian and explore the dependence of the effective one-body and two-body matrix elements on $N_{max}$. We will present the results of standard shell-model calculations using the derived effective Hamiltonian for $p$-shell nuclei with $A > 6$ and compare them to the exact NCSM results. The same procedure can be used for determining other effective operators within the $p$-shell, such as EM operators and transition operators.\\[4pt] [1] P. Navr\'atil, J. P. Vary and B. R. Barrett, Phys. Rev. C {\bf 62}, 054311 (2000).\\[0pt] [2] P. Navr\'atil, M. Thoresen and B. R. Barrett, Phys. Rev. C {\bf 55}, R573 (1997). [Preview Abstract] |
Tuesday, October 13, 2009 11:30AM - 12:00PM |
1WA.00006: Nuclear structure studies in JUSTIPEN and EFES activities Invited Speaker: JUSTIPEN: Japan-US Theory Institute for Physics with Exotic Nuclei was launched in June 2006. JUSTIPEN has been established in order to facilitate collaborations between U.S. and Japanese scientists whose main research thrust is in the area of the physics of exotic nuclei. More than 40 nuclear scientists in U.S. have visited Japan in three years, and the many collaborations are established. I briefly summarize the JUSTIPEN activity from the Japanese side. There is counterpart program for the Japanese scientists. International Research Network for Exotic Femto Systems (EFES) was selected as one of the Core-to-Core Programs of Japan Society for the Promotion of Science (JSPS). This is the program to send Japanese nuclear scientists to U.S., Germany, France, Italy, Norway, and Finland and to promote the international collaborations in the field of nuclear study. Many joint workshops were held with partner countries. To operate these international programs, University of Tokyo and RIKEN agreed to corporate with each other and established Todai-RIKEN Joint International Program for Nuclear Physics (TORIJIN) in June 2006. I summarize the activities in three years, and I also mention about the relation between these activities and my personal research -- many-body correlations in light nuclei. [Preview Abstract] |
Tuesday, October 13, 2009 12:00PM - 12:30PM |
1WA.00007: The continuum-discretized coupled-channels method applied to exotic nuclei Invited Speaker: Accurate nuclear reaction rates are needed for primordial nucleosynthesis and hydrostatic burning in stars. The relevant reactions are extremely difficult to measure directly in the laboratory at the small astrophysical energies. In recent years direct reactions have been developed and applied to extract low-energy astrophysical S-factors. These methods require a combination of new experimental techniques and theoretical efforts, which are the subject of this presentation. In this talk I will discuss the role of continuum states and their mutual coupling in extracting the nuclear astrophysical information from experimental data carried out at radioactive beam facilities. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700