2001/03/19 by R. Surman, J. Engel · 1 citation
Physics and Astronomy · #nucl-th
paper · pdf · doi:10.1103/physrevc.64.035801
published as Phys.Rev. C64 (2001) 035801 · 8 pages, 14 figures included in text
arxiv created 2001/03/19 · arxiv updated 2009/12/01
We explore changes in abundance patterns that occur late in the r process. As the neutrons available for capture begin to disappear, a quasiequilibrium funnel shifts material into the large peaks at A=130 and A=195, and into the rare-earth "bump" at A=160. A bit later, after the free-neutron abundance has dropped and beta-decay has begun to compete seriously with neutron capture, the peaks can widen. The degree of widening depends largely on neutron-capture rates near closed neutron shells and relatively close to stability. We identify particular nuclei the capture rates of which should be examined experimentally, perhaps at a radioactive beam facility.