Neutrino flow and gravitational collapse Page: 2 of 37

Rm~,n ,M nY ry t Sni wmn n
. nl~f -. AM . 1
-1_~~~~~ rn . arrw wn .
James R. Wilson
Lawrence Livermore Laboratory, University of California
Livermore, California 94550
The discovery of neutral currents in neutrino interactions has made
necessary the recalculation of the neutrino flow during stellar collapse.
Neutral currents cause a coherent scattering cross section of complex nuclei
proportional to the square of the atomic weight. This allows neutrinos to
escape easily from the hot, dense center where only free baryons exist. The
neutrinos then interact strongly in the outer region of high atomic weight and,
under certain circumstances, produce a supernovae-like explosion in the outer
reaches of the star, leaving a neutron star behind. For an explosion t. occur,
the scattering in the envelope of heavy nuclei must be greater than the
scattering of the free baryons in the core. In particular, with Freedman's
interpretation of Weinberg's theory, the cross section ratio is insufficient to
produce an explosion. Other theories state that suppressing the free baryon
cross section does lead to an explosion.
This work was performed under the a.uspices of the U.S. Energy Research &
Development Administration.
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Wilson, J.R. Neutrino flow and gravitational collapse, article, August 18, 1975; Livermore, California. ( accessed October 19, 2018), University of North Texas Libraries, Digital Library,; crediting UNT Libraries Government Documents Department.

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