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

Abstract

(Shorten version of the PRC abstract) Alpha-induced reactions on 127I have been studied using the activation technique in order to provide cross section data for the modeling of the astrophysical gamma process. The relative intensity of the 536.1 keV gamma transition was measured precisely, its uncertainty was reduced from 13% to 4%. By measuring the yield of the characteristic X-rays, the cross sections of the 127I(alpha,gamma)131Cs reaction have been determined for the first time close to the astrophysically relevant energy region, at energies 9.50 < Ec.m. < 15.15$MeV.The127I(alpha,n)130Csreactionwasstudiedintherange9.62<Ec.m.<15.15MeVbymeasuringtheyieldofthe536.1keVgamma-rayandatthelowerpartofthisenergyrangebycountingthecharacteristicX-rays.Acomparisonoftheresultingcrosssectionstopredictionsofstatisticalmodelcalculationsconfirmedthepredictionsoftheastrophysicallyrelevantaveragedalphawidth.Nevertheless,thenewlyderivedstellarreactionratesatgammaprocesstemperaturesfor127I(alpha,gamma)131$Cs and its reverse reaction are factors 4-10 faster than previous calculations, due to improvements in the reaction model.

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Cited by in corpus (15)

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• Further explorations of the alpha-particle optical model potential at low energies for the mass range A=45-209
• The activation method for cross section measurements in nuclear astrophysics
• Investigation of alpha-induced reactions on the p nucleus 168Yb
• Investigation of $\alpha$-induced reactions on Sb isotopes relevant to the astrophysical $\gamma$-process
• Measurements of ${}^{152}$Gd(p,$\gamma$)${}^{153}$Tb and ${}^{152}$Gd(p,n)${}^{152}$Tb reaction cross sections for the astrophysical $\gamma$ process
• Test of statistical model cross section calculations for $\alpha$-induced reactions on ${}^{107}$Ag at energies of astrophysical interest
• Cross section of $\alpha$-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical $\gamma$ process
• Experimental study of the astrophysical gamma-process reaction 124Xe(alpha,gamma)128Ba
• Systematic study of (p,γ) reactions on Ni isotopes
• Total reaction cross section ${\sigma }_{\mathrm{reac}}$ of $\alpha$-induced reactions from elastic scattering: the example ${}^{140}$Ce($\alpha$,$\alpha$)${}^{140}$Ce
• The 106Cd(alpha,alpha)106Cd elastic scattering in a wide energy range for gamma-process studies
• Unexpected properties of the ${}^{33}$S($\alpha$,p)${}^{36}$Cl reaction cross section at low energies
• Cross sections at sub-Coulomb energies: full optical model vs.\ barrier transmission for ${}^{40}$Ca + $\alpha$
• An ERC Starting Grant project on p-process nucleosynthesis concluded