Photo-induced depopulation of the 180Tam isomer via low-lying intermediate states: Structure and astrophysical implications

Details Photo-induced depopulation of the 180Tam isomer via low-lying intermediate states: Structure and astrophysical implications Photo-induced depopulation of the 180Tam isomer via low-lying intermediate states: Structure and astrophysical implications

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phrvc..65c5801b&link_type=abstract

Physical Review C, vol. 65, Issue 3, id. 035801

Physics

33

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

Scientific paper

The photo-induced depopulation of the quasistable isomer (t1/2>=1.2×1015 yr) in 180Ta with angular momentum and parity Jπ=9- at an excitation energy Ex=75 keV was studied at the new bremsstrahlung irradiation facility installed at the Stuttgart 4.3 MV DYNAMITRON accelerator in the energy range of bremsstrahlung end point energies between E0=0.8-3.1 MeV. The onset of the isomer depopulation could be observed starting at an end point energy of E0~1 MeV, i.e., at an intermediate state of 180Ta at or below that energy. Higher-lying intermediate states were found at 1.22, 1.43, 1.55, 1.85, 2.16, 2.40, 2.64, and 2.80 MeV. The extracted integrated cross sections show a remarkably strong depopulation of the 180Tam isomer by photoexcitation. The results are compared with previous experiments and recent quasiparticle-phonon model calculations. Implications of the results for a possible nucleosynthesis of 180Ta in the s process and the neutrino process are discussed.

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