Other
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977phdt.........3d&link_type=abstract
Ph.D. Thesis Rice Univ., Houston, TX.
Other
Light Elements, Nuclear Fusion, Pulsars, Supernova Remnants, Alpha Particles, Astronomical Models, Gamma Rays, Lithium, Nebulae, Particle Collisions
Scientific paper
It was proposed that (7)Li is produced in the galaxy primarily by collisions in helium-rich nebulae surrounding newly-born pulsars. The proposed model is reexamined for a nebula with a composition that is more characteristic of supernova ejecta, and with a more detailed treatment of the evolution of the energetic particles in the nebula. The major results of this work are: (1) Collisional losses at the early stages of the expansion greatly inhibit the achievement of a (7)Li/(6)Li ratio of 12. (2) To synthesize the required amount of (7)Li and avoid the overproduction of other light elements, at least one-third of the pulsar's total luminosity needs to be converted in a rather special injection spectrum of particles. (3) A characteristic feature of the model is that gamma ray fluxes resulting from the deexcitation of (7)Li*(478 keV) and (7)Be*(431 keV) must exceed those resulting from the 4.44 MeV deexcitation of (12)C* by at least a factor of three.
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