Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session R12: Dissertation and Mentorship Awards |
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Sponsoring Units: DNP Chair: Robert Tribble, Texas A&M University Room: Grand Hall East A/B |
Monday, April 2, 2012 1:30PM - 2:06PM |
R12.00001: Dissertation Award in Nuclear Physics Lecture: New Germanium Detectors for Neutrino Research and Dark Matter Searches Invited Speaker: Phillip Barbeau The recent development of large mass, low noise P-Type point contact (PPC) germanium detectors has opened up new opportunities for experiments in neutrino and astroparticle physics. Several of these experiments have been performed with the earliest prototypes. As part of a campaign to measure coherent neutrino-nucles scattering (CoGeNT), and assessment of the low energy backgrounds at a nuclear power reactor are presented. Using the exposure of the detector to this high flux of neutrinos, a search for a neutrino magnetic moment is demonstrated and a projected limit from a more complete experiment is discussed. A limit is also placed on the magnitude of a continuous energy deposition by reactor neutrinos. Searches for signatures of light WIMPs and dark galactic pseudoscalars using these detectors are highlighted. Finally, the role that the PPC detectors play in searches for zero neutrino double beta decay, specifically within the MAJORANA collaboration, is also discussed. [Preview Abstract] |
Monday, April 2, 2012 2:06PM - 2:42PM |
R12.00002: Dissertation Award in Nuclear Physics Lecture: T violation in nuclear systems. An effective approach Invited Speaker: Emanuele Mereghetti The observation of the electric dipole moment (EDM) of the neutron, proton or deuteron in the next generation of experiments will be a clear signal of new physics, originating at scales comparable to those probed at the LHC. I will discuss how the formalism of Effective Field Theories, in particular Chiral Perturbation Theory, can be a powerful tool to follow the clues from EDM experiments back to the dominant mechanism(s) of time-reversal (T) violation at high energy. I will consider the lowest-dimension P- and T-violating operators that can be added to the QCD Lagrangian, the dimension four QCD theta term and several dimension six operators. I will construct the low-energy interactions between pions, nucleons and photons stemming from each fundamental source and discuss the implications for the EDMs of light nuclei. I will show how the different properties under chiral symmetry of the microscopic sources result in qualitative different relations between the EDMs of one, two and three nucleon systems. [Preview Abstract] |
Monday, April 2, 2012 2:42PM - 3:18PM |
R12.00003: Orbital Angular Momentum in the Nucleon Invited Speaker: Gerald Garvey More than 20 years ago the EMC found the spin carried by quarks in the proton to be significantly less than 1/2. Twenty years of extensive research has not discovered where the rest of the nucleon's angular momentum resides. Lattice gauge calculations have not uncovered a promising route to the solution to this dilemma. As angular momentum must be conserved the missing spin must reside somewhere. More than a decade ago DIS and Drell-Yan experiments revealed a sizable asymmetry in the sea of the nucleon. This asymmetry is not found in existing lattice gauge calculations. The size of the measured asymmetry and its x dependence convincingly demonstrate that the flavor asymmetry is due to the pionic fluctuations of the nucleon. These pionic fluctuations carry a significant amount of orbital angular momentum aligned along the proton spin, accounting for some of the missing spin not found on partons. [Preview Abstract] |
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