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(Shorten version of the PRC abstract) Alpha-induced reactions on 127I havebeen studied using the activation technique in order to provide cross sectiondata for the modeling of the astrophysical gamma process. The relativeintensity of the 536.1 keV gamma transition was measured precisely, itsuncertainty was reduced from 13% to 4%. By measuring the yield of thecharacteristic X-rays, the cross sections of the 127I(alpha,gamma)131Csreaction have been determined for the first time close to the astrophysicallyrelevant energy region, at energies 9.50 < Ec.m. < 15.15$ MeV. The127I(alpha,n)130Cs reaction was studied in the range 9.62 < Ec.m. < 15.15 MeVby measuring the yield of the 536.1 keV gamma-ray and at the lower part of thisenergy range by counting the characteristic X-rays. A comparison of theresulting cross sections to predictions of statistical model calculationsconfirmed the predictions of the astrophysically relevant averaged alpha width.Nevertheless, the newly derived stellar reaction rates at gamma processtemperatures for 127I(alpha,gamma)131$Cs and its reverse reaction are factors4-10 faster than previous calculations, due to improvements in the reactionmodel.

Investigation of alpha-induced reactions on 127I for the astrophysical gamma process