26Al(n,p1) and (n,α0) cross sections from thermal energy to 70 keV and the nucleosynthesis of 26Al

Details 26Al(n,p1) and (n,α0) cross sections from thermal energy to 70 keV and the nucleosynthesis of 26Al 26Al(n,p1) and (n,α0) cross sections from thermal energy to 70 keV and the nucleosynthesis of 26Al

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phrvc..56.1138k&link_type=abstract

Physical Review C (Nuclear Physics), Volume 56, Issue 2, August 1997, pp.1138-1143

Physics

Nuclear Physics

21

Transfer Reactions, Hydrostatic Stellar Nucleosynthesis, Big Bang Nucleosynthesis, 20<=A<=38

Scientific paper

We have measured the 26Al(n,α0)23Mg and 26Al(n,p1)26Mg* cross sections from thermal energy to approximately 10 keV and 70 keV, respectively. These reactions are thought to be the major mechanisms for the destruction of 26Al in many nucleosynthesis environments; hence, an accurate determination of their rates is important for understanding the observations of γ rays from ``live'' 26Al in our galaxy and of ``extinct'' 26Al in meteorites. The astrophysical rate for the 26Al(n,α0)23Mg reaction determined from our measurements is in good agreement with the rate determined via inverse measurements. On the other hand, the rate we determined for the 26Al(n,p1)26Mg* reaction is significantly larger than previously reported. In addition, we were able to determine this rate in the temperature range below 0.2 GK which was not covered by previous measurements. This lower temperature range may be important for understanding the production of 26Al in Red Giant stars. Both of our rates are significantly different than the rates used in most nucleosynthesis calculations. We discuss the impact of our measurements on the nucleosynthesis of 26Al.

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