Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session M3: Neutron Stars in the Multi-Messenger EraInvited
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Sponsoring Units: DNP DAP Chair: Sanjay Reddy, University of Washington Room: Ballroom B |
Sunday, April 17, 2016 3:30PM - 4:06PM |
M3.00001: Neutron Stars in the Multi-Messenger Era Invited Speaker: Sanjay Reddy . [Preview Abstract] |
Sunday, April 17, 2016 4:06PM - 4:42PM |
M3.00002: Probing neutron rich matter with parity violation Invited Speaker: Charles Horowitz Many compact and energetic astrophysical systems are made of neutron rich matter. In contrast, most terrestrial nuclei involve approximately symmetric nuclear matter with more equal numbers of neutrons and protons. However, heavy nuclei have a surface region that contains many extra neutrons. Precision measurements of this neutron rich skin can determine properties of neutron rich matter. Parity violating electron scattering provides a uniquely clean probe of neutrons, because the weak charge of a neutron is much larger than that of a proton. We describe first results and future plans for the Jefferson Laboratory experiment PREX that measures the thickness of the neutron skin in 208Pb. Another JLAB experiment CREX will measure the neutron radius of 48Ca and test recent microscopic calculations of this neutron rich 48 nucleon system. Finally, we show how measuring parity violation at multiple momentum transfers can determine not just the neutron radius but the full radial structure of the neutron density in 48Ca. A neutron star is eighteen orders of magnitude larger than a nucleus (km vs fm) but both the star and the neutron rich nuclear skin are made of the same neutrons, with the same strong interactions, and the same equation of state. A large pressure pushes neutrons out against surface tension and gives a thick neutron skin. Therefore, PREX will constrain the equation of state of neutron rich matter and improve predictions for the structure of neutron stars. [Preview Abstract] |
Sunday, April 17, 2016 4:42PM - 5:18PM |
M3.00003: Exploring the Physics of Compact Objects with Gravitational-Wave Astronomy Invited Speaker: Duncan Brown The Advanced Laser Interferometer Gravitational Wave Observatory (LIGO) has recently completed its first observing run. Future observations of gravitational waves by LIGO will open a new field in astronomy. The gravitational waves radiated by binaries containing neutron stars and/or black holes contain information about strong field gravity and the properties of dense matter. In this talk I will discuss the nuclear and gravitational physics that can be learned from the observation of compact-object mergers [Preview Abstract] |
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