Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may..k709l&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #K7.09
Astronomy and Astrophysics
Astrophysics
Scientific paper
^180Ta is nature's rarest isotope and the only one that occurs in an excited state. Its nucleosynthetic origin remains a puzzle. One of the unanswered questions is whether or not ^180Ta can survive the high temperatures and densities that are required for the synthesis of heavy elements in stars. The answer to this question depends on the existence of excited states in ^180Ta that can electromagnetically decay to both the long-lived ^180Ta^m and the short-lived ^180Ta^g. In order to address this issue, we have produced ^180Ta via the ^176Yb(^7Li,3n) reaction and have studied the γ-ray transitions in this nucleus using GAMMASPHERE. Many γ-rays have been placed into a level scheme, but as yet no level has been observed to decay to both ^180Ta^m and ^180Ta^g. The astrophysical implications of these results will be discussed.
Becker Jacques
Bernstein L. A.
Chan Yuen-Dat
Farris L. P.
Isaac M. P.
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