Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis

Details Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..77a5809c&link_type=abstract

Physical Review C, vol. 77, Issue 1, id. 015809

Astronomy and Astrophysics

Astrophysics

2

Radiative Capture, Nuclear Reaction Models And Methods, Direct Reactions, 90<=A<=149

Scientific paper

The direct and semi-direct (DSD) components of the neutron capture cross sections are calculated for a series of tin isotopes by employing a single-particle potential (SPP) that gives a good reproduction of the known single-particle energies (SPEs) over a wide mass region. The results are compared with the Hauser-Feshbach (HF) contribution in the energy region of astrophysical interest. The calculated result shows that the HF component drops off rapidly for isotope Sn132 and toward more neutron-rich ones, whereas the DSD component decreases only smoothly and eventually becomes dominant. This result is consistent with those of previous studies, but the dependence of the DSD cross section on the target mass number is a feature of the present SPP that gives a smooth variation of SPEs. As a consequence, the direct portion of the DSD component gives the largest contribution to the total (n,γ) cross section for neutron-rich isotopes below a few MeV. Therefore, the direct capture process modifies the astrophysical (n,γ) reaction rates to a great extent. The semi-direct component, however, gives a negligible contribution to the astrophysical reaction rates, but its impact is significant above several MeV. The reason for the difference in isotopic dependence between the HF and DSD components is discussed, and its implication for r-process nucleosynthesis is given.

Affiliated with

Also associated with

No associations

Rating

Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct and semi-direct capture in low-energy (n,γ) reactions of neutron-rich tin isotopes and its implications for r-process nucleosynthesis will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1257251