Physics – Nuclear Physics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phrvc..53.2474j&link_type=abstract
Physical Review C (Nuclear Physics), Volume 53, Issue 5, May 1996, pp.2474-2485
Physics
Nuclear Physics
6
Radiative Capture, 59<=A<=89, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
A setup with Moxon-Rae detectors was optimized for measurements of (n,γ) cross sections in the keV region. The experimental technique makes use of the quasi-Maxwellian spectrum that can be obtained via the 7Li(p,n)7Be reaction and is particularly suited for the determination of Maxwellian-averaged cross sections for nucleosynthesis studies related to s-process scenarios. It allows measurements at extremely short flight paths with the time-of-flight method as an option for background reduction. The experimental determination of the efficiency with calibrated γ sources and with two-step cascades from selected resonances of the 34S(p,γ) reaction revealed new properties of the response function. The reliability of the method was first demonstrated at the example of the well-known ratio of the (n,γ) cross sections of Ta and Au, and then used for a measurement of the stellar 87Rb cross section. With this new value <σv>/vT=15.5+/-1.5 mb, a discrepancy in the previously existing data could be resolved.
Jaag S.
Käppeler Franz
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