Astrophysical reaction rate for ${}^9$Be formation within a three-body approach

Abstract

The structure of the Borromean nucleus ${}^9$Be ($\alpha +\alpha +n$) is addressed within a three-body approach using the analytical transformed harmonic oscillator method. The three-body formalism provides an accurate description of the radiative capture reaction rate for the entire temperature range relevant in Astrophysics. At high temperatures, results match the calculations based on two-step sequential processes. At low temperatures, where the particles have no access to intermediate two-body resonances, the three-body direct capture leads to reaction rates larger than the sequential processes. These results support the reliability of the method for systems with several charged particles.

Revised subsections III A,E and F. Accepted in Phys. Rev. C

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