Accession Number : AD0718320

Title :   On the Photo-Induced Beta Decay of Protons and Neutrons in Stellar Interiors,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Hayes,John N.

Report Date : 06 JAN 1971

Pagination or Media Count : 30

Abstract : In this first phase of a study on photon-induced beta decay, the reaction rate for gamma + p yields n + Positron + Nu sub e is determined for conditions approximating those in stellar interiors. It is shown that the lifetime of the proton in such conditions drops from infinity to only microseconds as the temperature varies from 0 to 10 to the 12th power degrees K. Hence the stability of the proton against this reaction is not seriously altered and will not affect nucleosynthesis (which depends on the availability of protons). However, the reactions gamma + n yields p + electron + Nu sub e bar and electron + p yields n + Nu sub e are not restrained by threshold energy requirements. If the neutron's lifetime is drastically reduced by this latter reaction to the point that it cannot live long enough to react with nuclei, then nucleosynthesis in stars will be curtailed at very high temperatures. Attempts in this latter case to proceed with calculations along the same line as the gamma + p calculation run immediately into a divergence problem, as is shown here. The correct handling of this reaction will be the subject of another report when completed. (Author)

Descriptors :   (*STARS, *PHOTONUCLEAR REACTIONS), BETA DECAY, FIELD THEORY, BLACKBODY RADIATION, PERTURBATION THEORY, HAMILTONIAN, INTEGRALS, NUMERICAL INTEGRATION, HALF LIFE, PROTON REACTIONS, NEUTRON REACTIONS

Subject Categories : Astrophysics
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE