The (n,γ) cross sections of the p-process nuclei ⁷⁴Se and ⁸⁴Sr at kT=25 keV

Dillmann, I. and Heil, M. and Kappeler, F. and Rauscher, T. and Thielemann, F. K.. (2005) The (n,γ) cross sections of the p-process nuclei ⁷⁴Se and ⁸⁴Sr at kT=25 keV. Nuclear physics. A, Nuclear and hadronic physics, Vol. 758 , S. 513C-516C.

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Official URL: http://edoc.unibas.ch/dok/A5253957

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The formation of the isotopes on the proton-rich side of the valley of stability cannot be ascribed to neutron capture reactions in the r- or s-processes. These nuclei are produced in the p process, which presumably takes place in the explosively burning O/Ne layers of SNe II. At typical temperatures of 2-3 GK, the p nuclei are produced by a complex reaction network via (gamma,n), (gamma,p), (gamma,alpha) and their inverse reactions. So far most of these reactions are not yet accessible to experimental techniques and must, therefore, be inferred by statistical model calculations. At present, the parametrization of these models has to be constrained by measurements on stable proton-rich nuclei. First results for the stellar (n,gamma) cross sections of Se-14 and Sr-84 are reported for a thermal energy of kT = 25 keV. These values were determined in a series of activation measurements at the Karlsruhe Van de Graaff accelerator using the Li-7(p,n)(7) Be source for simulating a Maxwellian neutron energy distribution.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Thielemann, Friedrich-Karl and Rauscher, Thomas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:North Holland
Note:Variant title: >>The<< (n,gamma) cross sections of the p-process nuclei Se-74 and Sr-84 at kT=25 keV -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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