ESTIMATES OF THE ASTROPHYSICAL <font>S</font>-FACTORS FOR PROTON RADIATIVE CAPTURE BY ¹⁰<font>B</font> AND ²⁴<font>Mg</font> NUCLEI USING THE ANCs FROM PROTON TRANSFER REACTIONS

The contribution of the direct radiative capture of protons by 10 B and 24 Mg nuclei at low energies to the astrophysical S -factors in the reactions 10 B (p,γ) 11 C and 24 Mg (p,γ) 25 Al have been calculated within the R-matrix formalism by using empirical proton asymptotical normalization coefficients (ANC). The ANCs for bound proton configurations { 10 B +p} and { 24 Mg +p} were obtained from the analysis of the reactions ( 3 He , d). The ANCs were also estimated from the values of the neutron ANCs in the mirror nucleus 25 Mg following the suggestion that the neutron and the proton in the mirror states have equivalent nuclear potentials. It has been found that the S -factor for the reaction 10 B (p,γ) 11 C extrapolated to zero energy contributes ~100 keV b to the radiative capture to the ground state of 11 C . For the reaction 24 Mg (p,γ) 25 Al the value S(0) gives 58 keV b with a direct capture contribution of 41 keV b .

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