Low-energy photodisintegration of 9Be and alpha + alpha + n <-> 9Be + gamma reactions at astrophysical conditions

Abstract

A semi-microscopic model for the low-energy photodisintegration of the 9Be nucleus is constructed, and the experimental data are analyzed with its help. The older radioactive isotope data are supported by this analysis. The theoretical photodisintegration cross section is derived. The astrophysical rates for the reaction alpha + alpha + n -> 9Be + gamma and the reverse photodisintegration of 9Be are calculated. The new reaction rate for alpha + alpha + n -> 9Be + gamma is compared with previous estimations.

arXiv comment16 pages (uses revtex) and 3 postscript figures, accepted for publication in European Physical Journal A

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• Resonance parameters of the first 1/2+ state in 9Be and astrophysical implications
• Three-body resonant radiative capture reactions in astrophysics
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• Wave function of ${}^9$Be in the three-body (alpha-alpha-n)-model
• Beryllium-9 in Cluster Effective Field Theory
• The ${}^9$Be photodisintegration cross section within Cluster Effective Field Theory