Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...190.5301t&link_type=abstract
American Astronomical Society, 190th AAS Meeting, #53.01; Bulletin of the American Astronomical Society, Vol. 29, p.848
Astronomy and Astrophysics
Astronomy
Scientific paper
Large excesses of (44) Ca in certain presolar graphite and silicon carbide grains give strong evidence for (44) Ti production in supernovae. Furthermore, recent detection of the (44) Ti gamma -line from the Cas A SNR by CGRO/COMPTEL shows that radioactive (44) Ti is produced in supernovae. In this work we study the conditions needed for (44) Ti production in alpha-rich freezeouts in core-collapse supernovae as a function of peak temperature and density. We survey the key nuclear reactions governing (44) Ti production by varying their cross sections. We identify and rank their importance. We find (44) Ti production is most sensitive to variations in the rates of the reactions (44) Ti(alpha ,p)(47) V, alpha (2alpha ,gamma )(12) C, and (45) V(p,gamma )(46) Cr. Because many of these rates are unknown experimentally, our results suggest the most important targets for future cross section measurements.
Clayton Donald D.
Meyer Bradley S.
The Lih Sin
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