Coulomb excitation of 180Ta

Details Coulomb excitation of 180Ta Coulomb excitation of 180Ta

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvc..58.1790s&link_type=abstract

Physical Review C (Nuclear Physics), Volume 58, Issue 3, September 1998, pp.1790-1797

Physics

Nuclear Physics

15

Coulomb Excitation, Hydrostatic Stellar Nucleosynthesis, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages

Scientific paper

The existence of a low energetic intermediate state (IS) in 180Ta which provides a coupling of the stable isomer and the radioactive ground state was investigated by means of Coulomb excitation. Natural tantalum foils were irradiated by protons with incident energies between 3.0 and 3.7 MeV, and with α particles in the energy range 12-20 MeV. Subsequently, the foils were counted for the induced ground state activity of 180Ta. From the thick target yields an IS between 0.6 and 2.2 MeV excitation energy was inferred. The population of the IS in the stellar environment of the s process depends critically on the prevailing temperatures. Current stellar models suggest s-process temperatures below 3.1×108 K which lead to a negligible population of intermediate states above 1.2 MeV. Thus, the present data do not allow stringent conclusions about the destruction of 180Ta under these conditions, but an s process origin seems still possible. Furthermore, the experiments support the existence of a new isomer in 184Re.

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