Measurement of the (p,γ) cross sections of 46Ti, 64Zn, 114Sn, and 116Sn at astrophysically relevant energies

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Radiative Capture, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments

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The total cross sections for the Sn116(p,γ)Sb117, Sn114(p,γ)Sb115, Zn64(p,γ)Ga65, and Ti46(p,γ)V47 reactions have been measured using an activation technique for protons with center-of-mass energies between about 1 and 4 MeV. Radiative proton captures on 116Sn and 64Zn are compared to previous measurements while extending the measured energy range of the cross sections. From these measurements, astrophysical S-factors have been deduced by integrating NON-SMOKER results which have been scaled to the deduced S-factors in the measured energy range. Comparisons are made to thermonuclear reaction rates from the MOST and NON-SMOKER statistical model calculations. The accuracies of these codes are discussed in light of possible structure differences of the nuclei in question.

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