High Resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections of ^116,120Sn

Details High Resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections of ^116,120Sn High Resolution Neutron Capture and Transmission Measurements and the Stellar Neutron Capture Cross Sections of ^116,120Sn

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr.e1102k&link_type=abstract

American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #E11.02

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have made high-resolution (n,γ ) and transmission measurements on isotopically enriched samples of ^116,120Sn at the ORELA in the energy range from 100 eV to 500 keV. Improved astrophysical reaction rates for these isotopes are of interest because current nucleosynthesis models are not able to reproduce the observed abundances in this mass region. The problem may lie in the (n,γ ) cross sections used in the models. Previous (n,γ ) measurements had a lower energy limit of 3 keV or higher which is too high to determine accurately the Maxwellian-averaged capture cross sections at the low temperatures (kT=6-8 keV) favored by the most recent stellar models of the s process. In addition, with our new transmission data for ^116Sn we are able for the first time to calculate accurately the often substantial finite-thickness correction to the (n,γ ) data and hence obtain more accurate astrophysical reaction rates than in previous work. We will compare the results from the analysis of our new data to previous measurements and discuss their impact on calculations of the nucleosynthesis in this mass region.

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