New measurements of the astrophysical S factor for 12C(p, γ)13N reaction at low energies and the asymptotic normalization coefficient (nuclear vertex constant) for the p+12C → 13N reaction

被引:42
作者
Burtebaev, N. [1 ]
Igamov, S. B. [2 ]
Peterson, R. J. [3 ]
Yarmukhamedov, R. [2 ]
Zazulin, D. M. [1 ]
机构
[1] Inst Nucl Phys, Alma Ata 050032, Kazakhstan
[2] Inst Nucl Phys, Tashkent 100214, Uzbekistan
[3] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
来源
PHYSICAL REVIEW C | 2008年 / 78卷 / 03期
关键词
D O I
10.1103/PhysRevC.78.035802
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
New measurements of differential and total cross sections for the C-12(p,gamma)N-13 reaction have been made at beam energies of E-p = 354, 390, 460, 463, 565, 750, and 1061 keV. Analysis of the astrophysical S factor S(E) for the C-12(p,gamma)N-13 reaction at low energies and of the reaction rates has been carried out within the R-matrix approach by using the previously measured nuclear vertex constant (or the respective asymptotic normalization coefficient) for the virtual decay N-13 -> p + C-12 to fix the direct capture part of the amplitude in S(E). It is demonstrated that the R-matrix approach, using the measured asymptotic normalization coefficient, can be employed as an ideal tool, minimizing the uncertainties associated with a calculation of the direct capture cross section of the C-12(p,gamma)N-13 reaction at extremely low energies. New information on the proton and gamma width for the first excited state of N-13 is obtained.
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页数:11
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