New measurement of the Ec.m.=323 keV resonance in the 19F(p, γ) 20Ne reaction

被引：5
|
作者：
Williams, M. [1 ,2 ]
Adsley, P. [3 ,4 ]
Davids, B. [2 ,5 ]
Greife, U. [6 ]
Hutcheon, D. [2 ]
Karpesky, J. [6 ]
Lennarz, A. [2 ]
Lovely, M. [6 ]
Ruiz, C. [2 ]
机构：
[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England
[2] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada
[3] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, South Africa
[4] iThemba Lab Accelerator Based Sci, ZA-7129 Somerset West, South Africa
[5] Simon Fraser Univ, Dept Phys, 8888 Univ Dr, Burnaby, BC V5A 1S6, Canada
[6] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA
来源：
PHYSICAL REVIEW C | 2021年 / 103卷 / 05期
基金：
英国科学技术设施理事会; 加拿大自然科学与工程研究理事会;
关键词：
DESIGN;
D O I：
10.1103/PhysRevC.103.055805
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：
At temperatures below 0.1 GK, the F-19(p, gamma) Ne-20 reaction is the only breakout path out of the CNO cycle. Experimental studies of this reaction are challenging from a technical perspective due to copious gamma-ray background from the far stronger F-19(p, alpha) O-16 reaction channel. Here, we present the first inverse kinematics study of the F-19(p, gamma) Ne-20 reaction, in which we measure the strength of the 323-keV resonance. We find a strength value of omega gamma = 3.3(-0.9)(+1.1) meV, which is a factor of two larger than the most recent previous study. The discrepancy is likely the result of a direct to ground state transition which previous studies were not sensitive to. We also observe the transition to the first 2(-) state, which has not been observed for this resonance in previous studies. A new thermonuclear reaction rate is calculated and compared with the literature.
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页数：8
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