Reaction mechanism of Li7(3He,p)9Be and Li7(3H,n)9Be and primordial nucleosynthesis of Be9

Y. Yamamoto, T. Kajino, and K.-I. Kubo
Phys. Rev. C 47, 846 – Published 1 February 1993
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Abstract

We investigate in a unified way the reaction mechanism of Li7(3H,n)9Be and Li7(3He, p)9Be at the low energies Ec.m.≤2 MeV of astrophysical interest. Assuming charge independence of the nuclear reaction amplitudes and taking account of the effects from different isospin contribution, Coulomb interaction, and associated kinematical conditions properly, we constrain the upper and lower bounds of the total cross section of Li7(3H,n)9Be theoretically by using knowledge of the Li7(3He, p)9Be reaction. It is found that the total cross section of Li7(3H,n)9Be at Gamow window energy E∼250 keV is dominated by the near-threshold T=1 resonance whose resonance parameters are not determined at all experimentally, although the direct reaction process makes progressively important contributions at higher energies 500 keV≤Ec.m.. Primordial abundance of Be9 calculated in the inhomogeneous and standard big-bang models by using the inferred reaction cross section for Li7(3H,n)9Be is compared with recent results of astronomical observations.

  • Received 27 February 1992

DOI:https://doi.org/10.1103/PhysRevC.47.846

©1993 American Physical Society

Authors & Affiliations

Y. Yamamoto, T. Kajino, and K.-I. Kubo

  • Department of Physics, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachiohji, Tokyo 192-03, Japan

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Vol. 47, Iss. 2 — February 1993

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