Abstract.
Photon-induced reactions play a key role in the nucleosynthesis of rare neutron-deficient p -nuclei. The paper focuses on \(\ensuremath{(\gamma,\alpha)}\) , \(\ensuremath{(\gamma,{\rm p})}\) , and \({(\ensuremath{\gamma},{\rm n})}\) reactions which define the corresponding p -process path. The relation between stellar reaction rates and laboratory cross-sections is analyzed for photon-induced reactions and their inverse capture reactions to evaluate various experimental approaches. An improved version S C(E) of the astrophysical S -factor is suggested which is based on the Coulomb wave functions. S C(E) avoids the apparent energy dependence which is otherwise obtained for capture reactions on heavy nuclei. It is found that a special type of synchrotron radiation available at SPring-8 that mimics stellar blackbody radiation at billions of kelvins is a promising tool for future experiments. By using the blackbody synchrotron radiation, sufficient event rates for \(\ensuremath{(\gamma,\alpha)}\) and \({(\ensuremath{\gamma,{\rm p}})}\) reactions in the p -process path can be expected. These experiments will provide data to improve the nuclear parameters involved in the statistical model and thus reduce the uncertainties of nucleosynthesis calculations.
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Mohr, P., Fülöp, Z. & Utsunomiya, H. Photo-induced nucleosynthesis: Current problems and experimental approaches. Eur. Phys. J. A 32, 357–369 (2007). https://doi.org/10.1140/epja/i2006-10378-y
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DOI: https://doi.org/10.1140/epja/i2006-10378-y