Uncertainties in extracting S(17) from transfers
Uncertainties in extracting S(17) from transfers
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从转移中提取 S(17) 的不确定性
DOI：
10.1103/physrevc.59.2865
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发表时间：
1999
影响因子：
3.1
通讯作者：
I. Thompson
中科院分区：
文献类型：
--
作者：
J. Fernandes;R. Crespo;F. Nunes;I. Thompson
转移反应7Be(d，n)8B被用DWBA模拟为最近的低实验能量。对ANC方法提取S17天体物理因子的有效性进行了测试。我们表明，对于大于大约15 MeV的质心能量，外围假设不再准确。在所有情况下，我们都发现，只要入射通道的光势不是强烈的表面峰值，核心形变和/或激发效应就会很小。对DWBA的多步修正被发现是很小的。我们还强调，由于对入射和出射通道的光学势缺乏了解，导致提取的S17天体物理因子存在严重的不确定性。
The transfer reaction 7 Be(d,n) 8 B is modelled for the recent low experimental energies using the DWBA. Tests of the validity of the ANC method for the extraction of the S17 astrophysical factor are performed. We show that a peripheral assumption is no longer accurate for center of mass energies greater than approximately 15 MeV. In all cases we found that core deformation and/or excitation effects to be small as long as the optical potential for the entrance channel is not strongly surface peaked. Multistep corrections to the DWBA were found to be small. We also emphasize that the lack of knowledge of the optical potentials for the entrance and outgoing channels induces severe uncertainties in the extracted S17 astrophysical factor.