Bulletin of the American Physical Society
77th Annual Meeting of the Southeastern Section of the APS
Volume 55, Number 10
Wednesday–Saturday, October 20–23, 2010; Baton Rouge, Louisiana
Session NA: Fundamental Physics at the Oak Ridge Spallation Neutron Source |
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Chair: Roxanne Springer, Duke University Room: Nicholson Hall 119 |
Saturday, October 23, 2010 10:45AM - 11:15AM |
NA.00001: The neutron EDM experiment at the SNS Invited Speaker: A non-zero neutron electric dipole moment (EDM) would violate both parity and time reversal symmetry and measurement of this quantity will help to understand the source of baryon asymmetry in the universe. An effort is underway at the Spallation Neutron Source at Oak Ridge National Laboratory to measure the neutron EDM by detecting a modulation in the neutron spin precession frequency correlated with reversal of a strong electric field. In this experiment, ultra-cold neutrons are produced in liquid helium where the EDM is measured in situ. A trace amount of $^3$He is used as a co-magnetometer and as a detector of the neutron spin precession. Experimental details and projected results will be presented. [Preview Abstract] |
Saturday, October 23, 2010 11:15AM - 11:45AM |
NA.00002: Precision measurements in free neutron beta decay Invited Speaker: The study of neutron beta decay serves to determine the coupling constants of beta decay and allows several precision tests of the Standard Model of Elementary Particle Physics at low energies. For this purpose, the neutron lifetime, and correlations between the momenta and spins of the particles involved are measured. In my talk, I will discuss present experiments, with the emphasis of the neutron beta decay program planned for the fundamental physics beamline at the SNS. [Preview Abstract] |
Saturday, October 23, 2010 11:45AM - 12:15PM |
NA.00003: Hadronic parity-violation in pionless effective field theory Invited Speaker: At low energies, the weak interactions between quarks manifest themselves in a parity-violating component of the interactions between nucleons. Experiments are being performed at the SNS, NIST and other neutron facilities to map out this weak component of the nuclear force. I will describe how effective field theory is used to describe hadronic parity violation in a systematic and model-independent way. After discussing two-nucleon observables, such as the photon asymmetry $A_\gamma$ in polarized neutron capture $\vec n p \to d\gamma$, I will focus on the three-nucleon system. It is shown that parity-violating three-nucleon interactions do not contribute at the accuracy of current and prospective experiments. Therefore, few-nucleon experiments can be used to gain information on parity-violating two-nucleon interactions. I will also present the results of an effective field theory calculation of neutron spin rotation in deuterium. [Preview Abstract] |
Saturday, October 23, 2010 12:15PM - 12:45PM |
NA.00004: Physics with Spallation Neutron Source Neutrinos Invited Speaker: Copious neutrinos with energies of a few tens of MeV are produced at the SNS as a free by-product. This neutrino source is ideal for various neutrino experiments. I will describe the properties of such stopped-pion-beam sources of neutrinos, and will discuss the potential for measurements of neutrino cross-sections of astrophysical relevance, Standard Model tests, and neutrino oscillation physics. [Preview Abstract] |
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