Bulletin of the American Physical Society
2010 Fall Meeting of the APS Division of Nuclear Physics
Volume 55, Number 14
Tuesday–Saturday, November 2–6, 2010; Santa Fe, New Mexico
Session HB: Advances in Nuclear Theory |
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Chair: Ben Gibson, Los Alamos National Laboratory Room: Sweeny B |
Friday, November 5, 2010 10:30AM - 11:06AM |
HB.00001: Recent progress in hypernuclear physics Invited Speaker: An important goal of hypernuclear physics is to establish a fundamental understanding of the baryon-baryon interactions. Since experimental data on hyperon-nucleon scattering are scarce and none exist for hyperon-hyperon scattering, spectroscopic studies on the structure of hypernuclei provide absolutely crucial information. Recently, extensive precision theoretical calculations for hypernuclei have been performed. Moreover, high-resolution gamma-ray experimental detailing hypernuclear spectroscopy have been developing rapidly. By comparing these theoretical and experimental results, one can obtain useful information regarding hyperon-nucleon interactions. In the case of double strangeness nuclei such as double $\Lambda$ hypernuclei, recently we have three events by KEK-E373 emulsion data. In emulsion experiments, however, it is difficult to determine the spin- parity or even to know whether an observed even corresponds to a ground or excited state. Therefore, it is essential to compare the emulsion data with theoretical analyses to obtain a proper interpretation. By comparing observed data and theoretical calculation, we succeeded in identifying the states. In the future, we expect to have much data on strangeness S=$-1$ and S=$-2$ hypernuclei. In this talk, I shall report on recent progress in theoretical and experimental studies of hypernuclei and discuss future developments in this fields at J-PARC. [Preview Abstract] |
Friday, November 5, 2010 11:06AM - 11:42AM |
HB.00002: Recent Progress in Nuclear Density Functional Theory Invited Speaker: The nuclear mean-field theory, with its various extensions, plays a major role in the description of nuclear structure and excitations, and has somewhat gained the status of ``Standard Model'' in nuclear structure. Until recently, its microscopic variant has relied essentially on a phenomenological nucleon-nucleon interaction. Although qualitatively very versatile, such nuclear mean-field approaches are often not as precise as Shell Model or Ab Initio techniques, and their connection with the underlying theory of nuclear forces is not very clear. Three recent evolutions are beginning to change this picture, and suggest that the spectroscopic-quality description of heavy nuclei could be possible in a not so distant future. Firstly, the remarkable achievements of the Density Functional Theory (DFT) in Quantum Chemistry have proved very fruitful for the development of its nuclear counterpart; simultaneously, major progress has been made in the construction of nuclear interactions based on chiral effective field theory; finally, the fast development of large-scale computing facilities across the world has allowed calculations that were unthinkable only a few years ago. This talk will begin by a brief overwiew of modern nuclear DFT, essentially from a practitioner's point of view. Some of the recent noticeable achievements in the field will then be reviewed. Finally, I will indicate some of the present avenues of research in nuclear DFT. [Preview Abstract] |
Friday, November 5, 2010 11:42AM - 12:18PM |
HB.00003: Seniority in quantum many-body systems Invited Speaker: Seniority in the structure of nuclei refers to the number of nucleons that are not in pairs coupled to angular momentum J=0, and therefore it probes the most important two-body correlation within nuclei, ``pairing.'' Racah first introduced seniority in 1943 for the classification of complex atomic spectra and adapted it a few years later in the context of nuclear physics. Two key developments subsequent to Racah's original idea are: the treatment of neutrons and protons and the treatment of nucleons in several non-degenerate orbits. The conditions for seniority conservation will be reviewed and compared to those necessary for the full integrability of a system of interacting particles. The more recent possibility of ``partial'' seniority will be explored, where most states are of mixed seniority but some remain pure. This explains the occurrence of nuclear seniority isomers, characterized by electromagnetic decay hindered by selection rules related to seniority. Finally, the relevance of seniority as a generic concept will be illustrated with an application to Bose-Einstein condensates. [Preview Abstract] |
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