Direct measurement of the low-energy resonances in 22Ne(a, ?) 26Mg reaction

被引：3

作者：

Shahina ^{[1
,2
]}

Gorres, J. ^{[1
,2
]}

Robertson, D. ^{[1
,2
]}

Couder, M. ^{[1
,2
]}

Gomez, O. ^{[1
,2
]}

Gula, A. ^{[1
,2
]}

Hanhardt, M. ^{[3
,4
]}

Kadlecek, T. ^{[3
]}

Kelmar, R. ^{[1
,2
]}

Scholz, P. ^{[1
,2
]}

Simon, A. ^{[1
,2
]}

Stech, E. ^{[1
,2
]}

Strieder, F. ^{[3
]}

Wiescher, M. ^{[1
,2
]}

机构：

[1] Univ Notre Dame, Dept Phys & Astron, Notre Dame, IN 46556 USA

[2] Univ Notre Dame, Joint Inst Nucl Astrophys, Ctr Evolut Elements, Notre Dame, IN 46556 USA

[3] South Dakota Sch Mines & Technol, Dept Phys, Rapid City, SD 57701 USA

[4] South Dakota Sci & Technol Author, Sanford Underground Res Facil, Lead, SD 57754 USA

来源：

PHYSICAL REVIEW C | 2022年 / 106卷 / 02期

基金：

美国国家科学基金会;

关键词：

REACTION-RATES; S-PROCESS; NE-22(ALPHA; N)MG-25;

D O I：

10.1103/PhysRevC.106.025805

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：

The Ne-22(alpha, gamma) Mg-26 is an important reaction in stellar helium burning environments as it competes directly with one of the main neutron sources for the s-process, the Ne-22(alpha, n) Mg-25 reaction. The reaction rate of the 22Ne(alpha, gamma) 26Mg is dominated by the low-energy resonances at E ( lab)(alpha)= 650 and 830 keV, respectively. The E-alpha(lab) = 830-keV resonance has been measured previously, but there are some uncertainties in the previous measurements. We confirmed the measurement of the E-alpha(lab) = 830-keV resonance using implanted Ne-22 targets. We obtained a resonance strength of w gamma = 35 +/- 4 mu eV and provide a weighted average of the present and previous measurements of w gamma = 35 +/-; 2 mu eV with reduced uncertainties compared to previous studies. We also attempted to measure the strength of the predicted resonance at E-alpha(lab) = 650 keV directly for the first time and found an upper limit of w gamma < 0.15 mu eV for the strength of this resonance. In addition, we also studied the E (lab )(P)= 851-keV resonance in Ne-22(p, gamma) Na-23 and obtained a resonance strength of w gamma = 9.2 +/- 0.7 eV with significantly lower uncertainties compared to previous measurements.

引用

页数：8

共 50 条

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