Is γ-Ray Emission from Novae Affected by Interference Effects in the 18F(p, α)15O Reaction?

被引：39
|
作者：
Laird, A. M. [1 ]
Parikh, A. [2 ,3 ]
Murphy, A. St. J. [4 ]
Wimmer, K. [5 ,6 ]
Chen, A. A. [7 ]
Deibel, C. M. [8 ,9 ]
Faestermann, T. [10 ,11 ]
Fox, S. P. [1 ]
Fulton, B. R. [1 ]
Hertenberger, R. [11 ,12 ]
Irvine, D. [7 ]
Jose, J. [2 ,3 ]
Longland, R. [2 ,3 ]
Mountford, D. J. [4 ]
Sambrook, B. [7 ]
Seiler, D. [10 ,11 ]
Wirth, H. -F. [11 ,12 ]
机构：
[1] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England
[2] Univ Politecn Cataluna, EUETIB, Dept Fis & Engn Nucl, E-08036 Barcelona, Spain
[3] Inst Estudis Espacials Catalunya, E-08034 Barcelona, Spain
[4] Univ Edinburgh, Sch Phys & Astron, SUPA, Edinburgh EH9 3JZ, Midlothian, Scotland
[5] Michigan State Univ, Natl Supercond Cyclotron Lab, E Lansing, MI 48824 USA
[6] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA
[7] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
[8] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA
[9] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA
[10] Tech Univ Munich, Phys Dept E12, DE-85748 Garching, Germany
[11] Munchner Univ MLL, Maier Leibnitz Lab, DE-85748 Garching, Germany
[12] Univ Munich, Fak Phys, DE-85748 Garching, Germany
来源：
PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 03期
基金：
加拿大自然科学与工程研究理事会;
关键词：
SHELL NUCLEI; NUCLEOSYNTHESIS; STATES; NE-19;
D O I：
10.1103/PhysRevLett.110.032502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The 18F(p, alpha)O-15 reaction rate is crucial for constraining model predictions of the gamma-ray observable radioisotope F-18 produced in novae. The determination of this rate is challenging due to particular features of the level scheme of the compound nucleus, Ne-19, which result in interference effects potentially playing a significant role. The dominant uncertainty in this rate arises from interference between J(pi) = 3/2(+) states near the proton threshold (S-p = 6.411 MeV) and a broad J(pi) = 3/2(+) state at 665 keVabove threshold. This unknown interference term results in up to a factor of 40 uncertainty in the astrophysical S-factor at nova temperatures. Here we report a new measurement of states in this energy region using the F-19(He-3, t)Ne-19 reaction. In stark contrast to previous assumptions we find at least 3 resonances between the proton threshold and E-cm = 50 keV, all with different angular distributions. None of these are consistent with J(pi) = 3/2(+) angular distributions. We find that the main uncertainty now arises from the unknown proton width of the 48 keV resonance, not from possible interference effects. Hydrodynamic nova model calculations performed indicate that this unknown width affects F-18 production by at least a factor of two in the model considered. DOI: 10.1103/PhysRevLett.110.032502
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页数：5
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