Measurement of d + 7Be Cross Sections for Big-Bang Nucleosynthesis

被引：16

作者：

Rijal, N. ^{[1
,5
]}

Wiedenhover, I ^{[1
]}

Blacicmon, J. C. ^{[2
]}

Anastasiou, M. ^{[1
]}

Baby, L. T. ^{[1
]}

Caussyn, D. D. ^{[1
]}

Hoflich, P. ^{[1
]}

Kemper, K. W. ^{[1
]}

Koshchiy, E. ^{[3
]}

Rogachev, G., V ^{[3
,4
]}

机构：

[1] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[2] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[3] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[4] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[5] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 122卷 / 18期

基金：

美国国家科学基金会;

关键词：

30;

D O I：

10.1103/PhysRevLett.122.182701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The cross sections of nuclear reactions between the radioisotope Be-7 and deuterium, a possible mechanism of reducing the production of mass-7 nuclides in big-bang nucleosynthesis, were measured at center-of-mass energies between 0.2 and 1.5 MeV. The measured cross sections are dominated by the (d, alpha) reaction channel, towards which prior experiments were mostly insensitive. A new resonance at 0.36(5) MeV with a strength of omega gamma = 1.7(5) keV was observed inside the relevant Gamow window. Calculations of nucleosynthesis outcomes based on the experimental cross section show that the resonance reduces the predicted abundance of primordial Li-7, but not sufficiently to solve the primordial lithium problem.

引用

页数：6

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