Monte Carlo uncertainty of the 3He(α,γ)7Be reaction rate

被引：52

作者：

deBoer, R. J. ^{[1
]}

Goerres, J. ^{[1
]}

Smith, K. ^{[1
]}

Uberseder, E. ^{[1
]}

Wiescher, M. ^{[1
]}

Kontos, A. ^{[2
]}

Imbriani, G. ^{[3
,4
]}

Di Leva, A. ^{[3
,4
]}

Strieder, F. ^{[5
]}

机构：

[1] Univ Notre Dame, Dept Phys, Joint Inst Nucl Astrophys, Notre Dame, IN 46556 USA

[2] Michigan State Univ, Natl Superconducting Cyclotron Lab, Joint Inst Nucl Astrophys, E Lansing, MI 48823 USA

[3] Univ Naples Federico II, Naples, Italy

[4] Ist Nazl Fis Nucl, I-80125 Naples, Italy

[5] Ruhr Univ Bochum, Inst Expt Phys, Bochum, Germany

来源：

PHYSICAL REVIEW C | 2014年 / 90卷 / 03期

基金：

美国国家科学基金会;

关键词：

ABSOLUTE CROSS-SECTION; ELASTIC-SCATTERING; RADIATIVE-CAPTURE; POLARIZED HE-3; S-FACTOR; HE-3(ALPHA; MATRIX; BE7;

D O I：

10.1103/PhysRevC.90.035804

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：

Background: The He-3(alpha,gamma)Be-7 reaction is of critical importance in determining the flux of solar neutrinos through the pp-II and pp-III chains. For this reason and others, the description of the cross section and its extrapolation towards low-energy has always been a matter of intense debate. While large systematic differences have been present in the past, several recent measurements are all in excellent statistical agreement. Purpose: The convergence of the recent individual experimental measurements of the He-3(alpha,gamma)Be-7 reaction prompts a global analysis of the reaction data. From the combined data, a more precise estimate of the low-energy cross section can be determined. Results: A global R-matrix fit is used to describe the He-3(alpha,gamma)Be-7 data as well as scattering data over a similar energy range. The R-matrix fit is then subjected to a Monte Carlo analysis to extract the uncertainties on the cross section and corresponding reaction rate. Conclusion: By combining several recent measurements of the He-3(alpha,gamma)Be-7 reaction, the combined data yield a zero energy S factor of S(0) = 0.542 +/- 0.011(MC fit) +/- 0.006(model)(-0.011)(+0.019) (phase shifts) keV b. This gives a total uncertainty in S(0) of +0.023/-0.017 keV b.

引用

页数：10

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