Bulletin of the American Physical Society
APS April Meeting 2010
Volume 55, Number 1
Saturday–Tuesday, February 13–16, 2010; Washington, DC
Session G5: Recent Developments in Nuclear Physics |
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Sponsoring Units: DNP Chair: Richard Casten, Yale University Room: Thurgood Marshall West |
Sunday, February 14, 2010 8:30AM - 9:06AM |
G5.00001: Reordering of Nuclear Quantum States in Rare Isotopes Invited Speaker: A key question in modern nuclear physics relates to the ordering of quantum states, and whether the predictions made by the shell model hold true far from stability. Recent innovations in technology and techniques at radioactive beam facilities have allowed access to rare isotopes previously inaccessible to experimentalists. Measurements that have been performed in several regions of the nuclear chart have yielded surprising and dramatic changes in nuclear structure, where level ordering is quite different than expected from previous theoretical descriptions. In order to reconcile the difference between experiment and theory, new shell-model interactions have been proposed, which include the role of the tensor force as part of the monopole term from the expansion of the residual proton-neutron interaction. This has motivated a series of laser spectroscopy experiments that have studied the neutron-rich copper and gallium isotopes at the ISOLDE facility. This work has deduced without nuclear-model dependence the spin, moments and charge radii. The results of this work and their implications for nuclear structure near $^{78}$Ni will be discussed. [Preview Abstract] |
Sunday, February 14, 2010 9:06AM - 9:42AM |
G5.00002: An Effective-Field-Theory Analysis of Low-energy Parity Violation in the NN System Invited Speaker: At low energies, parity violation in NN scattering (including photons) is described by an effective field theory (EFT) that includes only contact interactions. I will discuss this EFT, and its application to observables that would be zero in the absence of parity violation: longitudinal asymmetries in polarized nucleon-nucleon scattering, and asymmetries arising from polarized $\vec n p \rightarrow d \gamma$ and $np \rightarrow d \vec {\gamma}$. [Preview Abstract] |
Sunday, February 14, 2010 9:42AM - 10:18AM |
G5.00003: Final Results on Muon Decay from TWIST Invited Speaker: The TWIST Collaboration is exploring the space-time structure of muon decay through precision measurements of the muon decay (Michel) parameters $\rho$, $\delta$, and $P_{\mu}\xi$. TWIST has already reported measurements of these parameters that improve on the previous world knowledge by factors of two ($P_{\mu}\xi$) to five ($\rho$ and $\delta$) and provide the best current limits on right-handed interactions in muon decay. Analysis of the final TWIST data is well along. It should achieve an additional factor of two in precision for $\rho$ and $\delta$ and up to a factor of three in precision for $P_{\mu}\xi$ compared to our previous results. At present, we expect to unblind the analysis late in 2009. The final results will be presented, and their implications for extensions to the Standard Model will be discussed. [Preview Abstract] |
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