出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：A small fraction (< 1%) of presolar SiC grains is suggested to have been formed in the ejecta of
classical novae. The 29P(p,g )30S reaction plays an important role in understanding the Si isotopic
abundances in such grains, which in turn provide us with information on the nature of the probable
white dwarf progenitor’s core, as well as the peak temperatures achieved during nova outbursts.
This rate is determined by two low-lying 3+ and 2+ resonances above the proton threshold in
30S at 4399 keV. Despite several experimental studies in the past however, the 3+ resonance has
only been recently observed in one experiment and no definitive evidence for the 2+ state has
been published yet. We have studied the 30S nuclear structure via the 32S(p,t)30S reaction at 5
laboratory angles between 9◦ to 62◦ . We have observed between 8 to 14 states above the proton
threshold including two levels at 4695.5 ± 3.5 keV and 4814.9 ± 3.5 keV that are candidates for
the 3+ and previously “missing” 2+ state, respectively.
