The low temperature photonuclear nucleosynthesis of the anomalously low-abundance isotopes V-50, La-138 and Ta-180

Details The low temperature photonuclear nucleosynthesis of the anomalously low-abundance isotopes V-50, La-138 and Ta-180 The low temperature photonuclear nucleosynthesis of the anomalously low-abundance isotopes V-50, La-138 and Ta-180

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apl....17...61h&link_type=abstract

Astrophysical Letters, vol. 17, no. 2, 1976, p. 61-68. Research supported by the North Texas State University.

Physics

10

Lanthanum Isotopes, Nuclear Fusion, Tantalum Isotopes, Vanadium Isotopes, Abundance, Hydrogen, Low Temperature Physics, Photoneutrons, Solar System

Scientific paper

Low-temperature photoneutron nucleosynthesis is proposed as an explanation of the origin of the isotopes V-50, La-138, and Ta-180, all of which have anomalously low solar-system abundances. Results of calculations are presented which show that 14- and 17-MeV photons from the proton-proton (II) hydrogen-cycle product Li-7 (p, gamma) Be-8 can cause photoneutron emission from the seed nuclei V-51, La-139, and Ta-181, resulting in the synthesis of the isotopes with anomalously low abundances. This comes about as a direct consequence of hydrogen burning at temperatures less than about 25 million K. It is found, however, that the proposed process may produce large overabundances of La-138 and Ta-180 within such a low-temperature hydrogen-burning region. Possible mechanisms for reducing the potentially large overabundances are considered, including effects of nuclear-decay schemes, mass dilution by envelope mixing before injection into the interstellar medium, and high-temperature photonuclear erosion of the two isotopes

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