${}^{187}$Re(\gamm,n) cross section close to and above the neutron threshold

Abstract

The neutron capture cross section of the unstable nucleus ${}^{186}$Re is studied by investigating the inverse photodisintegration reaction ${}^{187}$Re($\gamma$,n). The special interest of the {\it s}-process branching point ${}^{186}$Re is related to the question of possible {\it s}-process contributions to the abundance of the {\it r}-process chronometer nucleus ^{187}$Re.Weusethephotoactivationtechniquetomeasurephotodisintegrationrates.Ourexperimentalresultsareingoodagreementwithtwodifferentstatisticalmodelcalculations.Althoughthecrosssectionspredictedbybothmodelsfortheinversereaction$^{186}$Re(n,$γ$)istoolowtoremovetheoverproductionof$^{186}$Os; the two predicted neutron-capture cross sections differ by a factor of 2.4; this calls for future theoretical study.

arXiv commentPhys. Rev. C, in press

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• Photoactivation at a clinical LINAC: The 197Au(gamma,n)196Au reaction slightly above threshold
• Investigation of photoneutron reactions close to and above the neutron emission threshold in the rare earth region
• Comment on "187Re(gamma,n) cross section close to and above the neutron threshold"