S-process branchings at Sm-151, Eu-154, and Dy-163

Best, J. and Stoll, H. and Arlandini, C. and Jaag, S. and Kappeler, F. and Wisshak, K. and Mengoni, A. and Reffo, G. and Rauscher, T.. (2001) S-process branchings at Sm-151, Eu-154, and Dy-163. Physical review. C, Nuclear physics, Vol. 64, H. 1 , 015801.

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Official URL: http://edoc.unibas.ch/dok/A5839308

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The (n, gamma) cross sections of the stable europium isotopes Eu-151 and Eu-153 have been measured by irradiating oxide samples in a quasistellar neutron spectrum. From the induced activities, the stellar cross sections of Eu-151 and Eu-153 at a thermal energy of kT=30 keV were found to be [sigmav]/v(T)=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 Sm-152,Sm-154 and Er-164,Er-170. Among these results, the stellar cross section of the s-only isotope Er-164 [sigmav]/v(T)=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 Sm-151, Eu-152, and Eu-154. 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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Institute of Physics
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Sep 2012 07:18
Deposited On:14 Sep 2012 06:45

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