Bulletin of the American Physical Society
2011 Fall Meeting of the APS Division of Nuclear Physics
Volume 56, Number 12
Wednesday–Saturday, October 26–29, 2011; East Lansing, Michigan
Session FC: Trends in Nuclear Physics |
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Chair: Warren Rogers, Westmont College Room: 101 |
Thursday, October 27, 2011 4:00PM - 4:36PM |
FC.00001: Prize for a Faculty Member for Research in an Undergraduate Institution: Undergraduate Participation in the Study of Ultraperipheral Collisions at RHIC Invited Speaker: Janet Seger In ultraperipheral nuclear collisions, with impact parameters larger than twice the nuclear radius, the nuclei do not physically overlap, but instead interact via intense long-range electromagnetic fields. Heavy-ion colliders are therefore powerful tools to study photonuclear and two-photon interactions. These interactions typically produce final states with only a few particles and leave the colliding nuclei intact. Undergraduate students at Creighton University have been heavily involved in this physics program within the STAR (Solenoidal Tracker at RHIC) Collaboration for the last decade. We present recent STAR results on vector meson production in AuAu collisions at various energies, including the observation of coherent photoproduction of the J/Psi meson, as well as a 4-pion final state which may be associated with excited rho states that are not yet well understood. An emphasis will be placed on the contributions of undergraduate students. [Preview Abstract] |
Thursday, October 27, 2011 4:36PM - 5:12PM |
FC.00002: New Applications of Renormalization Group Methods in Nuclear Physics Invited Speaker: Kai Hebeler Renewed interest in the physics of nuclei is stimulated by experiments at rare isotope facilities, which open the way to new regions of exotic nuclei, and by astrophysical observations and simulations of neutron stars and supernovae, which require controlled constraints on the equation of state of nucleonic matter. The use of Renormalization Group methods to lower the characteristic resolution of inter-nucleon interactions is opening new avenues for calculations of low-energy nuclear structure and reactions. In this presentation I will give an overview over recent developments and discuss various results for the nuclear equation of state and the consequences for the structure of neutron stars, short-range correlations and the role of many-body forces in nuclear systems. [Preview Abstract] |
Thursday, October 27, 2011 5:12PM - 5:48PM |
FC.00003: Hypernuclear physics via $\gamma$-ray spectroscopy Invited Speaker: Hirokazu Tamura A series of hypernuclear $\gamma$-ray spectroscopy experiments performed at KEK-PS and BNL-AGS using a germanium detector array, Hyperball, have accumulated precise data on various p- shell $\Lambda$ hypernuclei. We observed ``hypernuclear fine structure'' in various hypernuclei and extracted the strengths of all the spin-dependent parts (spin-spin, spin-orbit, and tensor terms) of the $\Lambda$-$N$ interaction. The obtained strengths reproduced structure of most of the p-shell $\Lambda$ hypernuclei quite well, and also played important roles in testing and improving baryon-baryon interaction models. We also measured a B(E2) value of $^7_\Lambda$Li and confirmed ``shrinking effect'' of a $\Lambda$ hyperon. In the J-PARC facility, further experiments of hypernuclear $\gamma$-ray spectroscopy are planned to be performed. In the first experiment (E13), we will extend our study to s-shell and sd-shell hypernuclei and investigate the $\Lambda$-$N$ interaction more in detail. We also plan to study the g factor of a $\Lambda$ hyperon in a nucleus by measuring a B(M1) value of $\Lambda$-spin-flip transitions in hypernuclei in order to study possible modification of baryon properties in nuclear matter. In future, we will also investigate ``impurity effect'' of nuclear structure induced by a $\Lambda$, such as the shrinking effect and a possible change of nuclear deformation. [Preview Abstract] |
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