出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：First measurements of the stellar neutron capture cross sections are reported for the stable p
isotopes 168Yb, 184Os, and 196Hg. For 180W and 190Pt the uncertainties of 11% and 27% from
previous measurements could be significantly reduced. Neutrons were produced at the Karlsruhe
3.7 MV Van de Graaff Accelerator via the 7Li(p,n)7Be reaction. A series of activation
measurements was carried out in a quasi-stellar neutron spectrum of kT = 25 keV. The stellar
cross sections extrapolated to kT = 30 keV were found to be 1214±49 mbarn, 660±53 mbarn,
590±38 mbarn, 508±44 mbarn, 204±8 mbarn, and 26.7±1.3 mbarn for 168Yb, 180W, 184Os,
190Pt, 196Hg, and 196Hgm, respectively. These measurements are completing a systematic study
of stellar (n, g) cross sections of 14 stable p isotopes. The new results will be directly applied in
p-process studies using a reaction library with all available experimental information.
