Some limitations of detailed balance for inverse reaction calculations in the astrophysical P-process

Astronomy and Astrophysics – Astrophysics

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Astrophysics, Charged Particles, Gamma Rays, Neutrons, Photonuclear Reactions, Reaction Kinetics, Stellar Activity, Alpha Particles, Europium Isotopes, Promethium Isotopes, Stellar Evolution

Scientific paper

P-Process modeling of some rare but stable proton-rich nuclei requires knowledge of a variety of neutron, charged particle, and photonuclear reaction rates at temperatures of 2 to 3 x 109 K. Detailed balance is usually invoked to obtain the stellar photonuclear rates, in spite of a number of well-known constraints. We attempt to calculate directly the stellar rates for (gamma ,n) and (gamma, alpha) reactions on Eu-151. These are compared with stellar rates obtained from detailed balance, using the same input parameters for the stellar (n, gamma) and (alpha, gamma) reactions on Eu-150 and Pm-147, respectively. The two methods yielded somewhat different results, which will be discussed along with some sensitivity studies.

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