Astrophysical factor and rate of direct capture reaction in a potential modelстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 27 ноября 2021 г.
Аннотация:The astrophysical 7Be(p, γ )8B direct capture process is studied in the framework of a two-body singlechannel model with potentials of the Gaussian form. A modified potential is constructed to reproduce the new experimental value of the S-wave-scattering length and the known astrophysical S factor at the Gamow energy, extracted from the solar neutrino flux. The resulting potential is consistent with the theory developed by Baye [Phys. Rev. C 62, 065803 (2000)] according to which the S-wave scattering length and the astrophysical S factor at zero energy divided by the square of the asymptotic normalization coefficient are related. The obtained results for the astrophysical S factor at intermediate energies are in good agreement with the two data sets of Hammache et al. [Phys. Rev. Lett. 86, 3985 (2001); 80, 928 (1998)]. Linear extrapolation to zero energy yields S17(0) ≈ 20.51+2.02−1.85 eV b consistent with the Solar Fusion II estimate. The calculated reaction rates are substantially lower than the results of the NACRE II Collaboration.