Interpretation of the excitation and decay of 180Tam through a Kπ=5+ band

Details Interpretation of the excitation and decay of 180Tam through a Kπ=5+ band Interpretation of the excitation and decay of 180Tam through a Kπ=5+ band

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvc..64f1302w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 64, Issue 6, December 2001, p.061302

Physics

Nuclear Physics

21

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

Scientific paper

The production and survival of 180Ta in stars presents a nuclear structure and astrophysics puzzle. From earlier work in the laboratory, photon scattering from the 9-, 75 keV isomeric state has been shown to result in eventual de-excitation to the relatively short-lived 1+ ground state, through intermediate states whose character is uncertain. It is suggested here that the lowest observed photon resonances match the energies of known states in the rotational band based on the recently assigned Kπ=5+ state at 592 keV, states which are accessible by E1 excitation from the 9- isomer. Analysis of the previously observed resonance strengths and the known in-band properties implies γ-ray E1 transition probabilities which are stronger than expected given the nominal K forbiddenness. Predicted widths for ``back''-decay to the 9- isomer and its rotational band are calculated and shown to be significant. Their observation would have implications for the proposed associations and mixing effects above the yrast line.

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