Two-neutron capture reactions and the r process

Details Two-neutron capture reactions and the r process Two-neutron capture reactions and the r process

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..74a5802b&link_type=abstract

Physical Review C, vol. 74, Issue 1, id. 015802

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10

Few-Body Systems, Mass And Neutron Distributions, Nuclear Reaction Models And Methods, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments

Scientific paper

Rates for the He4(2n,γ)He6 and He6(α,n)Be9 reactions have been calculated, including both resonant and nonresonant contributions. The sequential two-neutron capture process on He4 has also been reevaluated on the basis of new experimental results. It is shown that a one-step dineutron capture reaction may enhance the sequential two-neutron reaction rate by several orders of magnitude. This opens the possibility that reaction flow through He4(2n,γ)He6(α,n)Be9 may occur in competition with the bottle-neck three-body reactions He4(2α,γ)C12 and the He4(αn,γ)Be9 that initiate the α process and provide seed nuclei for the r process. Here we explore the effect of such dineutron capture on r-process nucleosynthesis. We show that such reactions have little effect on the final abundance and would change only r-process abundances in an extremely neutron-rich low-temperature r process.

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