Münster 2002 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 4: Nuclear and Particle Astrophysics I
HK 4.5: Vortrag
Montag, 11. März 2002, 18:00–18:15, C
Neutrino-nucleon scattering rate in the relativistic random phase approximation — •Lysiane Mornas1 and Armando Pérez2 — 1Departamento de Física, Universidad de Oviedo, E-33007 Oviedo (Asturias), Spain — 2Departamento de Física Teórica, Universidad de Valencia, E-46100 Burjassot (Valencia), Spain
We present a calculation of the neutrino-nucleon scattering cross section which takes into account the nuclear correlations in the relativistic random phase approximation. Our approach is based on a quantum hadrodynamics model with exchange of σ, ω, π, ρ and δ mesons. In view of applications to neutrino transport in the final stages of supernova explosion and protoneutron star cooling, we study the evolution of the neutrino mean free path as a function of density, proton-neutron asymmetry and temperature.
Special attention was paid to the issues of renormalization of the
Dirac sea, residual interactions in the tensor channel, coupling
to the delta meson and meson mixing. In contrast with the results
of other authors [1,2], it is found that RPA corrections
with respect to the mean field approximation amount to only 10%
to 15% at high density [3].
[1] S. Reddy, M. Prakash, J.M. Lattimer and J. Pons, Phys. Rev. C59 (1999) 2888.
[2] S. Yamada and H. Toki, Phys. Rev. C61 (2000) 015803.
[3] L. Mornas and A. Pérez, nucl-th/0106058 subm. to Eur. Phys. J. A