Precise measurement of the 7Be(p,gamma)8B S-factor
Precise measurement of the 7Be(p,gamma)8B S-factor
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精确测量 7Be(p,gamma)8B S 因子
DOI：
10.1103/physrevc.68.065803
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发表时间：
2003
影响因子：
3.1
通讯作者：
A. Laird
中科院分区：
文献类型：
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作者：
A. Junghans;E. Mohrmann;Kurt Snover;T. D. Steiger;E. Adelberger;J. Casandjian;H. Swanson;L. Buchmann;S. Park;A. Zyuzin;A. Laird
本文给出了~ 7 Be（p，γ）~ 8B截面的新的测量结果，116至2460 keV（其中c.m.意思是质心），它结合了我们以前发表的实验，也在这里讨论的几个改进。我们的新的测量导致S_（17）（0）=22.1±0.6（expt）±0.6（theor）eV B，基于来自Ec.m.= 116至362 keV，其中中心值基于Descouvemont和Baye的理论。理论误差估计是基于12种不同理论对我们的低能数据的拟合。我们将我们的结果与从直接[7 Be（p，γ）8B]和间接（库仑解离和重离子反应）测量中提取的其他S17（0）值进行了比较，并表明这三种类型的实验结果是不相互兼容的。我们推荐一个“最佳”值，S 17（0）=21.4±0.5（实验）±0.6（理论）eV B，基于所有低于1+共振的现代直接测量的平均值。在伽莫夫窗口中心附近的20 keV处，我们给出了S因子：测量结果为S_（17）（20）=21.4±0.6（expt）±0.6（theor）eV B，推荐值为S_（17）（20）=20.6±0.5（expt）±0.6（theor）eV B。
We present new measurements of the 7Be(p,γ)8B cross section from E c.m.=116 to 2460 keV (where c.m. means center-of-mass), which incorporate several improvements over our previously published experiment, also discussed here. Our new measurements lead to S17(0)=22.1±0.6(expt)±0.6(theor) eV b based on data from E c.m.=116 to 362 keV , where the central value is based on the theory of Descouvemont and Baye. The theoretical error estimate is based on the fit of 12 different theories to our low-energy data. We compare our results to other S17(0) values extracted from both direct [7Be(p,γ)8B] and indirect (Coulomb-dissociation and heavy-ion reaction) measurements, and show that the results of these three types of experiments are not mutually compatible. We recommend a “best” value, S17(0)=21.4±0.5(expt)±0.6(theor) eV b , based on the mean of all modern direct measurements below the 1+ resonance. We also present S factors at 20 keV which is near the center of the Gamow window: the result of our measurements is S17(20)=21.4±0.6(expt)±0.6(theor) eV b , and the recommended value is S17(20)=20.6±0.5(expt)±0.6(theor) eV b .
T. Kikuchi、T. Motobayashi、N. Iwasa、Y. Ando、M. Kurokawa、S. Moriya、H. Murakami、T. Nishio、J. Ruan、S. Shimoura、S. Shirato、T. Uchibori、Y.
DOI：
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发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
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影响因子：
4.4
作者：
Fukuda, S;Fukuda, Y;Wilkes, RJ
通讯作者：
Wilkes, RJ