Accelerated decay of Ta-180(m) and Lu-176 in stellar interiors through gamma, gamma-prime reactions

Details Accelerated decay of Ta-180(m) and Lu-176 in stellar interiors through gamma, gamma-prime reactions Accelerated decay of Ta-180(m) and Lu-176 in stellar interiors through gamma, gamma-prime reactions

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..454c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 454-459. Research supported by SDIO.

Physics

Nuclear Physics

25

Nuclear Astrophysics, Radioactive Decay, Stellar Interiors, Chronometers, Cross Sections, Half Life, Lutetium Isotopes, Nuclear Fusion, Nuclei (Nuclear Physics), Tantalum Isotopes

Scientific paper

It has been suggested that the long-lived nuclei Ta-180(m) and Lu-176 may be used as stellar s-process chronometers. However, the recent reports of large cross sections for the (gamma, gamma-prime) reactions raise the concern that the evolution of these species may have been affected by the bath of thermal photons present at the s-process temperatures. The recent experimental results did not identify the energies at which the gamma, gamma-prime reactions occurred, so in this work the effective half-lives of Ta-180(m) and Lu-176 in a stellar environment are calculated as a function of the possible energies of states mediating the resonance reactions. The time scales indicate that, unless these large gateway states lie at relatively high energies, the s-process cannot be effectively dated from the observed abundance of these nuclei.

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