Abstract
The mass region between tin and tellurium is of relevance for s-process nucleosynthesis, since the s-only isotopes 122 Te, 123 Te, and 124 Te provide for a sensitive test of the neutron density during helium burning in red giant stars. In addition to the very accurate cross sections that are available for these s-only nuclei, complementary measurements are reported on 120 Sn, 121 Sb, 123 Sb, and 128 Te for an improved analysis of the s-process flow. The measurements were carried out via the activation technique in a quasi-stellar neutron spectrum for kT=25 keV, using gold as a cross section standard. The cross sections of the unstable isotopes, 121 Sn and 122 Sb, were determined by statistical model calculations with a carefully evaluated set of input parameters
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