Bulletin of the American Physical Society
2016 Fall Meeting of the APS Division of Nuclear Physics
Volume 61, Number 13
Thursday–Sunday, October 13–16, 2016; Vancouver, BC, Canada
Session CB: Nuclear Physics Beyond the Standard ModelInvited
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Sponsoring Units: DNP Chair: Brad Plaster, University of Kentucky Room: Pavilion Ballroom D |
Friday, October 14, 2016 8:30AM - 9:06AM |
CB.00001: Recent Results on the Electric Dipole of $^{199}$Hg Atoms Invited Speaker: Blayne Heckel The excess of matter over antimatter in the universe requires a source of CP violation beyond that contained in the standard model of particle physics. Electric dipole moment (EDM) measurements of elementary particles and atoms provide a sensitive means to search for CP violation beyond the standard model. Our group has recently reported a new upper limit on the EDM of $^{199}$Hg, four times more sensitive than previous results on $^{199}$Hg. The techniques used in the experiment will be described as well as our major findings and their implications on proposed CP violating parameters. [Preview Abstract] |
Friday, October 14, 2016 9:06AM - 9:42AM |
CB.00002: Status and Initial Results from the MAJORANA DEMONSTRATOR Invited Speaker: Jason Detwiler The MAJORANA DEMONSTRATOR is performing a sensitive search for the neutrinoless double-beta decay of $^{76}$Ge using an ultra-low background array of enriched HPGe detectors deployed at the Sanford Underground Research Facility in Lead, SD. This rare process is generically predicted to occur by large classes of beyond-the-Standard-Model theories, and its observation would indicate that lepton number is not a conserved quantity in nature, with implications for the matter-dominance of the universe. The techniques used for the MAJORANA DEMONSTRATOR include selection and production of materials extremely low in natural radioactivity, choice of detector technology enabling active rejection of background, and graded active and passive shielding, which together give a projected background rate that is the lowest among existing techniques. First data from the DEMONSTRATOR is in-hand, and I will present our preliminary background performance and sensitivity both to neutrinoless double-beta decay as well as other physics targets. I will discuss the current detector status and plans for future upgrades, and our ultimate goal to field a much larger array with even lower background that will be sensitive to Majorana neutrinos with an inverted mass ordering. [Preview Abstract] |
Friday, October 14, 2016 9:42AM - 10:18AM |
CB.00003: Multimessenger Observations of Neutron Star Mergers: Probing the Physics of High-Density Matter Invited Speaker: David Radice Neutron star mergers are Nature's ultimate hadron colliders. They are extremely violent events resulting in gravitational-waves and electromagnetic emissions that could be detected at distances of several hundred mega-parsecs. Imprinted in these signals are important clues on the properties of high-density matter, waiting to be harnessed by us. In this talk, I will review our current knowledge of neutron star mergers from the theoretical side. I will discuss the prospects of measuring neutron star radii and masses using gravitational-wave observations of the late-inspiral of merging neutron stars. Then, I will show how multimessenger observations of the merger and post-merger evolution of merging neutron stars could be used to place further constrains on the nuclear equation of state at very high densities. Finally, I will discuss the possible role of neutron star mergers in the creation of the r-process nuclei in the Universe. [Preview Abstract] |
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