Physics – Nuclear Physics
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..dnp..da02t&link_type=abstract
American Physical Society, Division of Nuclear Physics Meeting, October 20-23, 1999 Pacific Grove, CA, abstract #DA.02
Physics
Nuclear Physics
Scientific paper
Significant production of ^44Ti (τ_1/2 = 59.5 years) is expected to occur in supernovae of Type II. Subsequent to its decay, this ^44Ti is believed to represent the main source of the ^44Ca in Galactic matter. COMPTEL observations of the Cas A supernova remnant revealed gamma rays from ^44Ti decay at a level 3.4 x 10-5 cm-2 s-1, consistent with the synthesis of approximately 10-4 solar masses of ^44Ti. This result holds important implications for supernova nucleosynthesis theory. Observations of elemental titanium in the oldest stars in our Galaxy suggest that the rate of flow through ^44Ti to ^48Cr (which decays to ^48Ti) and beyond must be quite rapid. The critical reaction here is ^44Ti(α,p)^47V. Recent experimental studies of this reaction yield a stellar thermonuclear reaction rate that is significantly higher than those obtained from standard theoretical (Hauser-Feshbach) calculations. The implications of this recent work for Galactic nucleosynthesis, the energetics of the light curve of Supernova 1987A, and searches for ^44Ti decay gamma rays from Galactic supernova remnants will be discussed.
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