Depopulation of 180Tam by Coulomb excitation and possible astrophysical consequences

Details Depopulation of 180Tam by Coulomb excitation and possible astrophysical consequences Depopulation of 180Tam by Coulomb excitation and possible astrophysical consequences

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phrvc..50.2198s&link_type=abstract

Physical Review C (Nuclear Physics), Volume 50, Issue 4, October 1994, pp.2198-2204

Physics

Nuclear Physics

33

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

Scientific paper

The depopulation of 180Tam by Coulomb excitation was investigated in a thick-target experiment using beams of 32S and 36S with energies of 70-130 MeV on disks of natural tantalum. The resulting 180Ta ground-state population was measured by detecting its eight-hour decay. At the higher incident energies the observed 180Ta yield is dominated by sub-Coulomb neutron pickup transfer reactions on the 104 times more abundant 181Ta. At the lower incident energies in 180Ta ground-state yield is found to be compatible with Coulomb excitation of the isomer to an intermediate level with energies Ex<1 MeV and a reduced transition probability B(E2)~=0.02-0.25 Weisskopf units. Consequences for the astrophysical production mechanism of 180Ta are discussed.

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