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Journal Article

Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange

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Schwenk,  Achim
Institut fur Kernphysik, Technische Universitat Darmstadt, 64289 Darmstadt, Germany;
ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum fur Schwerionenforschung GmbH, 64291 Darmstadt, Germany ;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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1608.05037.pdf
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Citation

Bartl, A., Bollig, R., Janka, H.-T., & Schwenk, A. (2016). Impact of Nucleon-Nucleon Bremsstrahlung Rates Beyond One-Pion Exchange. Physical Review D, 94(08): 083009. doi:10.1103/PhysRevD.94.083009.


Cite as: https://hdl.handle.net/21.11116/0000-0002-A126-D
Abstract
Neutrino-pair production and annihilation through nucleon-nucleon
bremsstrahlung is included in current supernova simulations by rates that are
based on the one-pion-exchange approximation. Here we explore the consequences
of bremsstrahlung rates based on a modern nuclear interactions for
proto-neutron star cooling and the corresponding neutrino emission. We find
that despite a reduction of the bremsstrahlung emission by a factor of 2-5 in
the neutrinospheric region, models with the improved treatment exhibit only
$\lesssim$5% changes of the neutrino luminosities and an increase of
$\lesssim$0.7 MeV of the average energies of the radiated neutrino spectra,
with the largest effects for the antineutrinos of all flavors and at late
times. Overall, the proto-neutron star cooling evolution is slowed down
modestly by $\lesssim$0.5-1 s.