Low-energy Behavior of the Astrophysical Factors for the Direct Radiative Captures to Loosely Bound States

Details Low-energy Behavior of the Astrophysical Factors for the Direct Radiative Captures to Loosely Bound States Low-energy Behavior of the Astrophysical Factors for the Direct Radiative Captures to Loosely Bound States

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..haw.kb002m&link_type=abstract

American Physical Society, First Joint Meeting of the Nuclear Physicists of the American and Japanese Physical Societies October

Astronomy and Astrophysics

Astrophysics

Scientific paper

The low-energy behavior of the astrophysical S-factor for the direct radiative captures leading to loosely bound final states is investigated. Notorious cases, ^7Be(p, γ)^8B, ^16O(p,γ)^17F and ^20Ne(p, γ) ^21Na, are considered. We find that the binding energy, \varepsilon, and the angular orbital momentum of the final state are two crucial parameters which govern the behavior of the S-factor at E → 0. We demonstrate that the increase of the S-factor at E → 0 is not generated by the pole of the S-factor at E= -\varepsilon but rather by the nonsingular or less singular terms.

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