Proton capture cross section of Ge 72 and astrophysical implications

F. Naqvi, S. J. Quinn, A. Spyrou, A. Battaglia, M. Couder, P. A. DeYoung, A. C. Dombos, X. Fang, J. Görres, A. Kontos, Q. Li, S. Lyons, D. Robertson, A. Simon, K. Smith, M. K. Smith, E. Stech, W. P. Tan, M. Wiescher

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2 Scopus citations


This paper reports on the first cross section measurement of the Ge72(p,γ)As73 reaction. The proton capture reaction on Ge72 is relevant to the astrophysical p-process and was identified in a sensitivity study as one of the important reactions required to estimate the abundances of the light p nuclei. The γ-summing technique was employed using the summing NaI(Tl) detector (SuN) from the National Superconducting Cyclotron Laboratory. The experiment was performed at the University of Notre Dame using a 1.8-3.6 MeV proton beam. In order to test the predictive power of different theoretical calculations in the region, experimental values were compared to the results given by the nuclear reaction code talys1.6. The theoretical uncertainties in the cross section arising from different combinations of nuclear level densities, γ-ray strength functions, and optical model potentials were reduced to 10-18% by the experimental data. The recommended reaction rates from the standard astrophysical libraries, BRUSLIB and REACLIB, are found to be in good agreement with the experimental results.

Original languageEnglish
Article number025804
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - 17 Aug 2015
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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