Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..378j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 378-382.
Astronomy and Astrophysics
Astrophysics
38
Monte Carlo Method, Neutrinos, Neutron Stars, Supernova Remnants, Supernovae, Antineutrinos, Energy Transfer, Optical Thickness, Particle Collisions
Scientific paper
Monte Carlo techniques are employed to investigate the transport of neutrinos in the semitransparent material around and external to the 'neutrino sphere' in a newly formed neutron star. The characteristics of the transport of neutrinos of all kinds as revealed by the Monte Carlo studies are discussed and approximate formulas for a description more accurate than the 'vacuum approximation' are presented. Backscattering of neutrinos in collisions with nucleonic targets is found to isotropize the neutrino radiation field and to increase the efficiency of energy transfer to the stellar material due to neutrino-antineutrino annihilation reactions. This amplification occurs in material of densities still larger than roughly 10 to the 10th g/cu cm, while further out limb darkening effects reduce the energy deposition considerably.
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