Measurement of Radiative Proton Capture on 18F and Implications for Oxygen-Neon Novae

被引：15

作者：

Akers, C. ^{[1
,2
]}

Laird, A. M. ^{[2
]}

Fulton, B. R. ^{[2
]}

Ruiz, C. ^{[1
]}

Bardayan, D. W. ^{[3
]}

Buchmann, L. ^{[1
]}

Christian, G. ^{[1
]}

Davids, B. ^{[1
]}

Erikson, L. ^{[4
]}

Fallis, J. ^{[1
]}

Hager, U. ^{[5
]}

Hutcheon, D. ^{[1
]}

Martin, L. ^{[1
]}

Murphy, A. St. J. ^{[6
]}

Nelson, K. ^{[7
]}

Spyrou, A. ^{[8
,9
]}

Stanford, C. ^{[10
]}

Ottewell, D. ^{[1
]}

Rojas, A. ^{[1
]}

机构：

[1] TRIUMF, Vancouver, BC V6T 2A3, Canada

[2] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

[3] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[4] Pacific Northwest Natl Lab, Richland, WA 99354 USA

[5] Colorado Sch Mines, Golden, CO 80401 USA

[6] Univ Edinburgh, SUPA, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[7] McMaster Univ, Hamilton, ON L8S 4L8, Canada

[8] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[9] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[10] Univ Waterloo, Waterloo, ON N2L 3G1, Canada

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 26期

基金：

美国国家科学基金会;

关键词：

REACTION-RATES;

D O I：

10.1103/PhysRevLett.110.262502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The rate of the F-18(p, gamma)Ne-19 reaction affects the final abundance of the gamma-ray observable radioisotope F-18, produced in novae. However, no successful measurement of this reaction exists and the rate used is calculated from incomplete information on the contributing resonances. Of the two resonances thought to play a significant role, one has a radiative width estimated from the assumed analogue state in the mirror nucleus, F-19. The second does not have an analogue state assignment at all, resulting in an arbitrary radiative width being assumed. Here, we report the first successful direct measurement of the F-18(p, gamma)Ne-19 reaction. The strength of the 665 keV resonance (E-x = 7.076 MeV) is found to be over an order of magnitude weaker than currently assumed in nova models. Reaction rate calculations show that this resonance therefore plays no significant role in the destruction of F-18 at any astrophysical energy.

引用

页数：5

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