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The neutron-capture cross sections of 64Zn, 68Zn, and 70Zn have been measuredwith the activation technique in a quasistellar neutron spectrum correspondingto a thermal energy of kT = 25 keV. By a series of repeated irradiations withdifferent experimental conditions, an uncertainty of 3% could be achieved forthe 64Zn(n,g)65Zn cross section and for the partial cross section68Zn(n,g)69Zn-m feeding the isomeric state in 69Zn. For the partial crosssections 70Zn(n,g)71Zn-m and 70Zn(n,g)71Zn-g, which had not been measured sofar, uncertainties of only 16% and 6% could be reached because of limitedcounting statistics and decay intensities. Compared to previous measurements on64,68Zn, the uncertainties could be significantly improved, while the 70Zncross section was found to be two times smaller than existing modelcalculations. From these results Maxwellian average cross sections weredetermined between 5 and 100 keV. Additionally, the beta-decay half-life of71Zn-m could be determined with significantly improved accuracy. Theconsequences of these data have been studied by network calculations forconvective core He burning and convective shell C burning in massive stars.

Neutron activation of natural zinc samples at kT = 25 keV