Cross section and reaction rate of Mo92(p,γ)Tc93 determined from thick target yield measurements

Gyürky, György and Vakulenko, M. and Fülöp, Zsolt and Halász, Zoltán and Kiss, Gábor Gyula and Somorjai, Endre and Szücs, Tamás (2014) Cross section and reaction rate of Mo92(p,γ)Tc93 determined from thick target yield measurements. NUCLEAR PHYSICS A, 922. pp. 112-125. ISSN 0375-9474

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Abstract

For the better understanding of the astrophysical γ-process the experi- mental determination of low energy proton- and α-capture cross sections on heavy isotopes is required. The existing data for the 92Mo(p,γ)93Tc reaction are contradictory and strong fluctuation of the cross section is observed which cannot be explained by the statistical model. In this paper a new determina- tion of the 92Mo(p,γ)93Tc and 98Mo(p,γ)99mTc cross sections based on thick target yield measurements are presented and the results are compared with existing data and model calculations. Reaction rates of 92Mo(p,γ)93Tc at temperatures relevant for the γ-process are derived directly from the mea- sured thick target yields. The obtained rates are a factor of 2 lower than the ones used in astrophysical network calculations. It is argued that in the case of fluctuating cross sections the thick target yield measurement can be more suited for a reliable reaction rate determination.

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