(70)Ge(p,gamma)(71)As and (76)Ge(p,n)(76)As cross sections for the astrophysical p process: Sensitivity of the optical proton potential at low energies

G. G. Kiss, Gy. Gyuerky, Z. Elekes, Zs. Fueloep, E. Somorjai, T. Rauscher

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Abstract

The cross sections of the (70)Ge(p,gamma)(71)As and (76)Ge(p,n)(76)As reactions have been measured with the activation method in the Gamow window for the astrophysical p process. The experiments were carried out at the Van de Graaff and cyclotron accelerators of ATOMKI. The cross sections have been derived by measuring the decay gamma-radiation of the reaction products. The results are compared to the predictions of Hauser-Feshbach statistical model calculations using the code NON-SMOKER. Good agreement between theoretical and experimental S factors is found. Based on the new data, modifications of the optical potential used for low-energy protons are discussed.

Original languageEnglish
Article number055807
Number of pages9
JournalPhysical Review C (nuclear physics)
Volume76
Issue number5
DOIs
Publication statusPublished - Nov 2007

Keywords

  • STATISTICAL-MODEL CALCULATIONS
  • PROCESS NUCLEOSYNTHESIS
  • RELEVANT
  • RP
  • GAMMA-PROCESSES
  • FINITE NUCLEI
  • REACTION-RATES
  • HARD-CORE INTERACTION

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