Cross-section measurement of the F18(α,p)Ne21 reaction and possible implication for neutron production in explosive helium burning

Details Cross-section measurement of the F18(α,p)Ne21 reaction and possible implication for neutron production in explosive helium burning Cross-section measurement of the F18(α,p)Ne21 reaction and possible implication for neutron production in explosive helium burning

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvc..80b5805l&link_type=abstract

Physical Review C, vol. 80, Issue 2, id. 025805

Astronomy and Astrophysics

Astrophysics

1

R-Process, Resonance Reactions, Statistical Compound-Nucleus Reactions

Scientific paper

At the high temperature and density conditions of hot or explosive helium burning, the F18(α,p)Ne21 reaction may compete successfully with the F18(β+ν) decay. This suggests Ne21(α,n) as an alternative neutron source in the r-process. We have determined the total cross section of the F18(α,p)Ne21 reaction by studying the time-reverse reaction Ne21(p,α)F18. Using the activation technique, the total reaction yield was measured in the proton beam energy range of 2.3-4.0 MeV, which corresponds to energies of 0.5-2.1 MeV in the F18+α system. The resulting yield curve was analyzed in terms of the thick target formalism and the R-matrix theory. The reaction rate was deduced experimentally for the first time for the temperature of 0.1

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