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 JB: Recent Advances in Nuclear Physics Dedicated to Virginia R. Brown and Bunny C. ClarkInvited
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Sponsoring Units: DNP Chair: Roxanne Springer, Duke University Room: Pavilion Ballroom D |
Saturday, October 15, 2016 10:30AM - 11:06AM |
JB.00001: Neutrino-antineutrino pair production by hadronic bremsstrahlung Invited Speaker: Sonia Bacca I will report on recent calculations of neutrino-antineutrino pair production from bremsstrahlung processes in hadronic collisions and consider temperature conditions relevant for core collapse supernovae. Earlier studies on bremsstrahlung from neutron-neutron collisions [1,2] showed that the approximation used in typical supernova simulation to model this process differs by about a factor of 2 from predictions based on chiral effective field theory, where the chiral expansion of two-body forces is considered up to the next-to-next-to-next-to-leading order [3]. When the density of neutrons is large enough this process may compete with other non-hadronic reactions in the production of neutrinos, in particular in the case of $\mu$ and $\tau$ neutrinos, which are not generated by charged-current reactions. A natural question to ask is then: what is the effect of neutrino pair production from collisions of neutrons with finite nuclei? To tackle this question, we recently have addressed the case of neutron-$\alpha$ collisions [4], given that in the $P$-wave channels the neutron-$\alpha$ scattering features a resonance near $1$ MeV [5]. We find that the resonance leads to an enhanced contribution in the neutron spin structure function at temperatures in the range of $0.1-4$ MeV. For significant density fractions of $\alpha$ in this temperature range, this process is competitive with contributions from neutron-neutron scattering. [1] S.Bacca, K.Hally, C.J.Pethick, A.Schwenk, Phys. Rev. C, 80 032802 (2009) [2] S.Bacca, K.Hally, M.Liebendoerfer, A.Perego, C.J.Pethick, A.Schwenk, Astrophys. J. 758, 34 (2012) [3] D.R.Entem, R.Machleidt, Phys. Rev. C 68, 041001 (2003) [4] R.Sharma, S.Bacca, A.Schwenk, Phys. Rev. C 91, 042801(R) (2015) [5] R. A. Arndt and L. D. Roper, Phys. Rev. C 1, 903 (1970) [Preview Abstract] |
Saturday, October 15, 2016 11:06AM - 11:42AM |
JB.00002: The origin of the heaviest elements: an interdisciplinary approach Invited Speaker: Rebecca Surman Bunny Clark and Virginia Brown were both advocates of community building, as a means to strengthen the scientific enterprise as a whole and to tackle specific problems of interest. In this spirit we will discuss a longstanding scientific problem---the astrophysical origins of the heavy elements---and describe how we are now on the verge of a solution due to interdisciplinary efforts connecting nuclear theory, astrophysical modeling, radioactive beam experiments, observational astronomy, and gravitational wave detections. [Preview Abstract] |
Saturday, October 15, 2016 11:42AM - 12:18PM |
JB.00003: Nucleon spatial imaging Invited Speaker: Julie Roche A compelling modern development in the study of QCD in the confinement regime is the introduction of Generalized Parton Distribution functions (GPDs). These functions (as well as TMD functions) allow for a multidimensional description of the internal structure of hadrons far more complex than usual From factors or Parton Distributions functions. Indeed, GPDs measure the transverse spatial distribution of parton as a function of their longitudinal momentum fraction. The goal of the comprehensive program in hard exclusive processes at Jefferson lab is to gain information about GPDs. In this talk, such existing measurement as well as those planned in the near future will be presented and discussed. [Preview Abstract] |
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