Thumbnail
Access Restriction
Open

Author Wisshak, K. ♦ Voss, F. ♦ Theis, C. ♦ Kaeppeler, F. ♦ Guber, K. ♦ Kazakov, L. ♦ Kornilov, N. ♦ Reffo, G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ TIN ISOTOPES ♦ CAPTURE ♦ STELLAR ACTIVITY ♦ NEUTRONS ♦ ACCELERATORS ♦ CROSS SECTIONS ♦ VAN DE GRAAFF ACCELERATORS ♦ LITHIUM 7 TARGET ♦ PROTON REACTIONS ♦ BERYLLIUM 7 ♦ PROTON BEAMS ♦ CORRECTIONS ♦ R PROCESS ♦ S PROCESS
Abstract The neutron capture cross sections of {sup 114}Sn, {sup 115}Sn, {sup 116}Sn, {sup 117}Sn, {sup 118}Sn, and {sup 120}Sn were measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the {sup 7}Li({ital p},{ital n}){sup 7}Be reaction using a pulsed proton beam. Capture events were registered with the Karlsruhe 4{pi} barium fluoride detector. The experiment was complicated by the small ({ital n},{gamma}) cross sections of the proton magic tin isotopes and by the comparably low enrichment of the rare isotopes {sup 114}Sn and {sup 115}Sn. Despite significant corrections for capture of scattered neutrons and for isotopic impurities, the high efficiency and the spectroscopic quality of the BaF{sub 2} detector allowed the determination of the cross-section ratios with overall uncertainties of 1{endash}2{percent}, five times smaller compared to existing data. Based on these results, Maxwellian averaged ({ital n},{gamma}) cross sections were calculated for thermal energies between {ital kT}=10 and 100 keV. These data are used for a discussion of the solar tin abundance and for an improved determination of the isotopic {ital s}- and {ital r}-process components. {copyright} {ital 1996 The American Physical Society.}
ISSN 05562813
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review, C
Volume Number 54
Issue Number 3


Open content in new tab

   Open content in new tab