The 180mTa(γ,γ')180Ta Cross Section at 1.33 and 4.0 MeV and its Astrophysical Consequences

Details The 180mTa(γ,γ')180Ta Cross Section at 1.33 and 4.0 MeV and its Astrophysical Consequences The 180mTa(γ,γ')180Ta Cross Section at 1.33 and 4.0 MeV and its Astrophysical Consequences

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..238..917n&link_type=abstract

Capture gamma-ray spectroscopy. AIP Conference Proceedings, Volume 238, pp. 917-919 (1991).

Physics

Photon Absorption And Scattering, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

Enriched 180mTa samples were irradiated by an intense 60Co source of 1.5 PBq and with 4 MeV bremsstrahlung. Using the well known 115In(γ,γ')115mIn cross section as a standard, we obtained a cross section of 0.52 mbarn for the 180mTa(γ,γ')180Ta reaction at 4 MeV, and established an upper limit of 14 nbarn (2σ) at 1.33 MeV. These results mean that 180mTa can survive at temperatures lower than ~5×108 K, but that it is quickly destroyed via photoexcitation above 7×108 K. Accordingly, an s-process production of 180mTa during stellar helium burning remains a plausible possibility. The respective consequences for the observed abundance of nature's rarest stable isotope are discussed by means of new cross section information.

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