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arXiv 0811.0014nucl-ex
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由~(14)N(12 N,13 O)~(13)C质子转移反应确定的~(12)N(p,γ)~(13)O辐射俘获的天体物理S因子

Astrophysical S factor for the radiative capture 12N(p,gamma)13O determined from the 14N(12N,13O)13C proton transfer reaction

A. Banu, T. Al-Abdullah, C. Fu, C. A. Gagliardi, M. McCleskey, A. M. Mukhamedzhanov, G. Tabacaru, L. Trache, R. E. Tribble, Y. Zhai, F. Carstoiu, V. Burjan, V. Kroha

摘要:

用渐近归一化系数(ANC)方法计算了滴线核12 N上辐射质子俘获反应的截面。我们利用12 MeV/核子的~(14)N(~(12)N,~(13)O)~(13)C质子转移反应,提取~(13)O → ~(12)N + p的ANC,并由此计算~(12)N(p,γ)~(13)O反应的天体物理S因子的直接分量。讨论了所用的光学势和质子转移反应的DWBA分析。对于入口通道,光学势是从与传输测量同时进行的弹性散射测量推断的。根据该转移,我们确定ANC的平方,C^2(130 g. s.)= 2.53 +/- 0.30 fm-1,因此在零能量下直接天体物理S因子的值为0.33(4)keVb。在直接和共振俘获之间的低能量下的相长干涉导致Stotal(0)= 0.42(5)keVb的增强。12 N(p,gamma)13 O反应与富氢的大质量第三星族恒星的演化有关,因为它可能在热pp链核燃烧过程中发挥作用,可能发生在这样的物体中。

英文摘要:

The cross section of the radiative proton capture reaction on the drip line nucleus 12N was investigated using the Asymptotic Normalization Coefficient (ANC) method. We have used the 14N(12N,13O)13C proton transfer reaction at 12 MeV/nucleon to extract the ANC for 13O -> 12N + p and calculate from it the direct component of the astrophysical S factor of the 12N(p,gamma)13O reaction. The optical potentials used and the DWBA analysis of the proton transfer reaction are discussed. For the entrance channel, the optical potential was inferred from an elastic scattering measurement carried out at the same time with the transfer measurement. From the transfer, we determined the square of the ANC, C^2(13Og.s.) = 2.53 +/- 0.30 fm-1, and hence a value of 0.33(4) keVb was obtained for the direct astrophysical S factor at zero energy. Constructive interference at low energies between the direct and resonant captures leads to an enhancement of Stotal(0) = 0.42(5) keVb. The 12N(p,gamma)13O reaction was investigated in relation to the evolution of hydrogen-rich massive Population III stars, for the role that it may play in the hot pp-chain nuclear burning processes, possibly occurring in such objects.

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