Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session M3: Invited Session: Nuclear Structure of Rare Isotopes |
Hide Abstracts |
Sponsoring Units: DNP Chair: David Radford, Oak Ridge National Laboratory Room: Holiday 2 |
Sunday, April 12, 2015 3:30PM - 4:06PM |
M3.00001: Evolution of collectivity in exotic isotopes Invited Speaker: Shaofei Zhu Neutron-rich nuclei have been the subject of much recent investigations. From the recent studies, the weakening of the N=40 shell gap is ascribed to the strong interaction between nucleons in the $\pi$pf and the $\nu$g9/2 and $\nu$d5/2 orbitals, which induces energy shifts of the single-particle states, thereby leading to an increased collectivity in neutron-rich nuclei beyond and below the $^{68}$Ni$_{40}$ core. Studies in this context of selected neutron-rich nuclei will be conducted extensively at ATLAS with Gammasphere or GRETINA using reactions well above the Coulomb barrier. A number such experiments have demonstrated that the yrast states of hard-to-reach neutron-rich nuclei can be populated allowing experimental access to high-spin structures in regions inaccessible with conventional heavy-ion induced, fusion-evaporation reactions. [Preview Abstract] |
Sunday, April 12, 2015 4:06PM - 4:42PM |
M3.00002: New results on the structure of exotic nuclei Invited Speaker: Hiroyoshi Sakurai `Exotic nuclei' far from the stability line are unique objects of many-body quantum system, where ratios of neutron number to proton number are much larger or much smaller than those of nuclei found in nature. Their exotic properties and phenomena emerge from their large isospin asymmetry, and even affect scenarios of nucleosynthesis in universe. One of the exotic emergences is shell evolution. The magic numbers of stable nuclei are known; 2, 8, 20, 28, 50, 82 and 126. However the numbers 8, 20 and 28 have been found no more magic in a neutron-rich region, and new magic numbers such as 6, 16, 32 and 34 have been discovered. To access nuclei far from the stability line, especially neutron-rich nuclei, a large heavy-ion accelerator facility `Radioactive Isotope Beam Factory (RIBF)' was constructed at RIKEN, Japan in 2007. The facility is highly optimized for inflight production of fission fragments via a U beam. The accelerator complex delivers an intense 345 MeV/u U beam. The U nuclide is converted at a target to fission fragments. The fragments of interest are collected and separated at an inflight separator, and are delivered to several experimental devices. The shell evolution programs at RIBF have been conducted with two methods; in-beam gamma spectroscopy and decay spectroscopy. A standard setup of in-beam gamma spectroscopy is combination of a NaI gamma detector array `DALI2' and a beam line spectrometer `ZeroDegree Spectrometer (ZDS)'. Coincidence measurements of de-excitation gamma rays at DALI2 and of reaction products at ZDS make it possible to select reaction channels event-by-event and to observe excited states of exotic nuclei in a specific reaction channel. Recently, a French-made thick liquid hydrogen target system `MINOS' has been introduced to access more neutron-rich nuclei. Isomer and beta-delayed gamma spectroscopy is organized with a Euroball germanium cluster array system `EURICA' and an active silicon stopper In this talk, I would like to present recent contributions and activities of RIKEN for the shell evolution study. Special emphasis would be given to selected recent highlights. Several coming programs on the structure would be shown, too. [Preview Abstract] |
Sunday, April 12, 2015 4:42PM - 5:18PM |
M3.00003: Toward model-independent computations of atomic nuclei Invited Speaker: Thomas Papenbrock In recent years, we have seen a transformation toward precision calculations of nuclear properties. This progress is based on ideas and applications of effective field theory, the renaissance and new development of ab initio methods with an affordable computational cost, and the sheer availability of computational cycles. This talk reviews some of the recent developments and highlights the role of three-nucleon forces in nuclear saturation and the shell evolution of calcium isotopes, and of two-body currents in beta decay of light nuclei. [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