Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phrvc..64a5801b&link_type=abstract
Physical Review C, vol. 64, Issue 1, id. 015801
Physics
18
Radiative Capture, Compound Nucleus, 150<=A<=189, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages
Scientific paper
The (n,γ) cross sections of the stable europium isotopes 151Eu and 153Eu have been measured by irradiating oxide samples in a quasistellar neutron spectrum. From the induced activities, the stellar cross sections of 151Eu and 153Eu at a thermal energy of kT=30 keV were found to be <σv>/vT=3821+/-152 mb and 2733+/-110 mb, respectively. These results allowed us to resolve severe discrepancies among previous data. Similar activation measurements were also performed on 152,154Sm and 164,170Er. Among these results, the stellar cross section of the s-only isotope 164Er <σv>/vT=1084+/-51 mb at kT=30 keV is particularly important. Statistical model calculations were performed with emphasis on the effect of excited states as well as on the unstable isotopes 151Sm, 152Eu, and 154Eu. The combined set of cross sections was used for an updated analysis of the branchings at A=151, 152, 154, and 163. The temperature and density estimates derived via the classical approach are discussed and compared to stellar models for helium shell burning in low mass stars.
Arlandini Claudio
Best Jim
Jaag S.
Käppeler Franz
Mengoni Alberto
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