Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session D12: Invited Session: Testing of 3-Body Forces in Light Neutron-Rich Nuclei |
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Sponsoring Units: DNP Chair: Ernst Rehm, Argonne National Laboratory Room: Grand Hall East A/B |
Saturday, March 31, 2012 3:30PM - 4:06PM |
D12.00001: Study of neutron rich carbon isotopes Invited Speaker: Paul Fallon Electric quadrupole (E2) matrix elements are important quantities in nuclear structure. In particular they are sensitive to nuclear deformation, the decoupling of proton and neutron degrees of freedom, and are often affected by small components of the nuclear wave function. Neutron-rich carbon isotopes have attracted a great deal of attention recently, both experimentally and theoretically, with regards to the question of spatially extended (halo-like) and decoupled valence neutrons. For example, 19C and the drip-line nucleus 22C are proposed to have ground-state neutron halo structures. Electric quadrupole transition rates in 16C 18C and 20C are among the lowest found throughout the nuclear chart and this fact has been cited by some as evidence for a reduced coupling between the valence neutrons and the core nucleons. In this talk I will present the results from our experiments to measure the transition rates in 16,18,20C and discuss the evidence for a ``decoupling'' of valence neutrons from the core that goes beyond the usual shell model approach. Data will be compared to shell model and no-core (ab-initio) shell model calculations with NN and NN+NNN interactions. [Preview Abstract] |
Saturday, March 31, 2012 4:06PM - 4:42PM |
D12.00002: What can we learn about 3-body forces from electromagnetic transition rates? Invited Speaker: C.J. (Kim) Lister Electromagnetic transition matrix elements have emerged as surprisingly sensitive probes of the influence of three-body forces in nuclei. Recent advances in experimental techniques have made it possible to measure these matrix elements with sufficiently high precision that they can differentiate between three-body formulations. Results from Gammasphere and the Yale array on the isobar triplet $^{10}$C, $^{10}$B and $^{10}$Be will be presented, together with new Variational and Greens Function Monte Carlo calculations. [Preview Abstract] |
Saturday, March 31, 2012 4:42PM - 5:18PM |
D12.00003: Recent results from MoNA-LISA Invited Speaker: Artemisia Spyrou Studies of the nuclear properties of nuclei close and even beyond the limits of stability have revealed exotic modes of decay and new structural characteristics. The MoNA-LISA array is used at the National Superconducting Cyclotron Laboratory at Michigan State University to study nuclei along the neutron dripline. In a typical experiment, a radioactive beam is employed to produce the neutron-unbound state of interest. This state/resonance immediately decay into a neutron, which is detected by MoNA-LISA and a remaining charged nucleus detected by the sweeper magnet detector suite. In this talk, new exciting findings from recent MoNA-LISA experiments will be presented. These include the first observation of a dineutron decay from $^{16}$Be, the exploration of the ``south shore'' of the Island of Inversion and the first evidence of the decay of the troubling nucleus $^{26}$O. [Preview Abstract] |
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