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The reaction 11B(10B,9Be)12C was studied at an energy of 41.3 MeV with transitions to the ground (0+) and low-lying excited 4.44 MeV (2+) and 9.64 MeV (3-) states of the 12C nucleus. The measured angular distributions were analyzed using a modified distorted wave method, which assumes a one-step proton transfer mechanism [1]. It is shown that at small angles (in the region of the main diffraction maximum) this reaction occurs on the surface of the nucleus with a predominance of a one-step process. This made it possible to determine the values of asymptotic normalization coefficients (ANC) for 11В+р→12С. The ANC squares are 322±76 fm-1, 32.8±6.4 fm-1 and 1.26±0.44 fm-1 for the 0+, 2+ and 3- states of the 12C nucleus, respectively. The obtained ANC values were used to take into account the contribution of the direct process when calculating the astrophysical S-factors of the radiative capture of a proton by the 11B nucleus at astrophysical energies.
The obtained values of S – factors at zero energy are in excellent agreement with existing literature values, with the exception of the S(0,γ1) value obtained by J.H. Kelly et al [2], which is ⁓ 3 times lower than our result.
Acknowledgments. This work is funded by the Ministry of Science and Higher Education of the Republic of Kazakhstan (Grant# AP14870964 “Studies of the interaction of protons and ions 10B with nuclei 11B for thermonuclear and astrophysical applications”).
References:
1. S.V. Artemov et al., Eur. Phys. J. A 58:24 (2022)
2. J.H. Kelley et al., Phys, Rev. C 62, 025803 (2000)
| Section | Nuclear physics (Section 1) |
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