Stellar production cross section of 176Lum

Details Stellar production cross section of 176Lum Stellar production cross section of 176Lum

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phrvc..44..506z&link_type=abstract

Physical Review C (Nuclear Physics), Volume 44, Issue 1, July 1991, pp.506-513

Physics

Nuclear Physics

9

Radiative Capture, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The partial neutron capture cross section of 175Lu to the isomer 176Lum has been measured at kT=25 keV via the activation technique. Systematic uncertainties were carefully evaluated by two independent methods for determination of the induced activities and by variation of the relevant experimental parameters. The final cross section of 1135+/-30 mb was derived from six different activations. With this result, the production of the long-lived ground state 176Lug (t1/2=41 Gyr) by s process neutron captures would not be sufficient to account even for the observed lutetium abundance. Consequently, other mechanisms, e.g., thermally induced transitions from the isomer to the ground state must have enhanced the yield of 176Lug during the s process.

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