Bulletin of the American Physical Society
2007 Annual Meeting of the Division of Nuclear Physics
Volume 52, Number 10
Wednesday–Saturday, October 10–13, 2007; Newport News, Virginia
Session EA: Frontiers in Nuclear Structure |
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Chair: Charles Horowitz, Indiana University Room: Newport News Marriott at City Center Grand Salon I |
Friday, October 12, 2007 2:00PM - 2:36PM |
EA.00001: High-Momentum components of the nuclear wave function: access to the core and the tensor parts of the N-N Interaction Invited Speaker: The combination of inclusive and exclusive electron scattering data from JLab in kinematic regimes that were not reachable before, together with the analysis and interpretation of older data from hadronic reactions at BNL is finally revealing the details of short-range nucleon-nucleon correlations in nuclei. This talk will discuss the experiments involving the two-nucleon knock-out reactions $^{12}$C(e,e'pp) and $^{12}$C(e,e'pn) The most significant result is the demonstration of the dominance of correlated np pairs over pp pairs in the range of relative momenta 300--600 MeV/c. This can be explained in terms of short-range tensor-force dominance. These new results are essential for refining our understanding of the short-range behavior of the N-N force. Moreover, short range pp pairs are manifestation of asymmetric dense cold nuclear matter that can be studied in the laboratory, and are relevant to studying neutron stars. [Preview Abstract] |
Friday, October 12, 2007 2:36PM - 3:12PM |
EA.00002: Strangeness in nuclei: new insights into nuclear structure Invited Speaker: There has been a renaissance in studies of hypernuclei. A series of experiments at KEK and BNL have used the Hyperball Ge array to investigate $\gamma$-ray transitions in p-shell hypernuclei with unprecedented precision ($\sim$ keV resolution). About 20 $\gamma$-ray transitions have been observed, leading to the determination of seven doublet spacings. At Jefferson Lab, there has been a series of experiments demonstrating the feasibility of high-resolution (sub MeV) electroproduction studies of hypernuclei, providing complementary information (and improved resolution) relative to the traditional meson-induced reaction techniques. Each of these programs has new results and substantial planned extensions in the near future. What we have learned, and hope to learn, from this unique window into both nuclear structure and the nature of strong interactions will be reviewed. [Preview Abstract] |
Friday, October 12, 2007 3:12PM - 3:48PM |
EA.00003: The Nuclear Physics of Neutron Stars Invited Speaker: The neutron radius of a heavy nucleus is a fundamental nuclear-structure observable that remains elusive. Progress in this arena has been limited by the exclusive use of hadronic probes that are hindered by large and controversial uncertainties in the reaction mechanism. The finite nucleus - a system that is 18 order of magnitude smaller and 55 orders of magnitude lighter than a neutron star - may be used as a miniature surrogate to establish important correlations between its neutron skin and several neutron-star properties. Indeed, a nearly model-independent correlation develops between the neutron skin of ${}^{208}$Pb and the transition density between the liquid mantle and the solid crust in the neutron star. The implications of the proposed purely electroweak Parity Radius EXperiment (PREX) at the Jefferson Laboratory on neutron-star structure will be reviewed and connections to other fields, such as atomic and condensed-matter physics, will be established. [Preview Abstract] |
Friday, October 12, 2007 3:48PM - 4:24PM |
EA.00004: Laser Trapping and Probing of Exotic Helium Isotopes Invited Speaker: We have succeeded in laser trapping and cooling of the exotic helium isotopes, both $^{6}$He (t$_{1/2}$ = 0.8 sec) and $^{8}$He (t$_{1/2}$ = 0.1 sec), and have performed precision laser spectroscopy on individual trapped atoms. Based on the atomic isotope shifts measured along the isotope chain $^{3}$He - $^{4}$He - $^{6}$He - $^{8}$He, and on the precise theory of the atomic structure of helium, the nuclear charge radii of $^{6}$He and $^{8}$He are determined for the first time in a method independent of nuclear models. The results are compared with the values predicted by a number of nuclear structure calculations and test their ability to characterize these neutron rich, loosely bound halo nuclei. The $^{6}$He measurement was performed at ATLAS of Argonne, and the $^{8}$He measurement at GANIL, France. This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. [Preview Abstract] |
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