Abstract
The energy averaged (n,γ) cross sections of 58Ni and 78Se at a stellar energy of kT=25keV have been investigated with the so called activation technique, which represents a well established tool for measurements of stellar neutron cross sections. For both nuclides, offline decay counting is prohibitive due to the long half-lives of the reaction products as well as the absence of suitable γ-ray transitions. The measurements reported here are, therefore, based on accelerator mass spectrometry (AMS) determination of the number of 59Ni and 79Se nuclei produced by irradiation of Ni and Se targets in a quasi-stellar neutron spectrum. We present in this paper preliminary results of σexp(kT=25keV)=27.2±1.8mb and 61±10mb for neutron capture cross sections of 58Ni and 78Se, respectively.
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