http://arxiv.org/abs/1905.13634
We revisit the rates of neutrino pair emission and absorption from nucleon-nucleon Bremsstrahlung in supernova matter using the $T$-matrix formalism in the long wavelength limit. Based on chiral effective field theory ($\chi$EFT) two-body potentials, we solve the Bethe-Goldstone equation accounting for the in-medium $T$-matrix including non-diagonal contributions. Our calculations consider nucleons with arbitrary degree of degeneracy and hence account for final state Pauli blocking. We compare our results with one pion exchange (OPE) rates, commonly used in supernova simulations, and calculations using an effective on-shell diagonal $T$-matrix from measured phase shifts. We also estimate that multi-scattering processes and RPA correlations introduce small corrections on top of the in-medium $T$-matrix results at subsaturation densities.
G. Guo and G. Martínez-Pinedo
Mon, 3 Jun 19
53/59
Comments: 22 pages, 13 figures
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