The Reaction Rates Of 6He(a,n)9Be And 4He(2n,g)6He And The R-Process

Details The Reaction Rates Of 6He(a,n)9Be And 4He(2n,g)6He And The R-Process The Reaction Rates Of 6He(a,n)9Be And 4He(2n,g)6He And The R-Process

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..dnp.8p062b&link_type=abstract

American Physical Society, Division of Nuclear Physics Fall Meeting, October 30 - November 1, 2003, Tucson, Arizona, MEETING ID:

Physics

Nuclear Physics

Scientific paper

A possible astrophysical site for the r-process is the shock fronts of supernovae. In which case the reactions 4He(2n,g)6He and 6He(a,n)9Be could be of vital importance as they bridge the mass gaps at A=5 and 8, which hinder the re-assemblage of seed nuclei from the free alphas and nucleons. An updated level scheme of 10Be was used to calculate the reaction rate for the 6He(a,n)9Be reaction. Improved numerical integration and an updated B(E2,2+ -> 0+) in 6He gave on average 37capture of 2 neutrons on 4He than previously obtained. A reaction rate for dineutron capture is also calculated, considering both the resonant and direct-capture cross-sections. These dineutron capture rates are 6 orders of magnitude larger than the successive capture rates.

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