Studies of the 18F(p, α)15O reaction rate with a 18F beam at the HRIBF

被引：0
|
作者：
Bardayan, DW [1 ]
Blackmon, JC
del Campo, JG
Kozub, RL
Liang, JF
Ma, Z
Shapira, D
Smith, MS
机构：
[1] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
[2] Tennessee Technol Univ, Dept Phys, Cookeville, TN 38505 USA
[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
来源：
NUCLEAR PHYSICS A | 2004年 / 746卷
基金：
美国能源部;
关键词：
D O I：
10.1016/j.nuclphysa.2004.09.089
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 rates of the F-18(p, alpha)O-15 and F-18(p,gamma)Ne-19 reactions at T = 0.1-0.4 GK are necessary to understand the emission of positron-annihilation gamma rays expected from novae. Observations of such gamma rays by space-based telescopes would provide direct tests of nova models. These rates, however, are uncertain because of the unknown level structure of Ne-19 above the F-18+p threshold. Missing levels in Ne-19 were searched for by stopping a 24-MeV F-18 beam in a thick polypropylene target, and scattered protons were detected in a silicon-strip detector. The F-18(p, p)F-18 excitation function has been measured from E-c.m. = 0.3-1.3 MeV covering most energies of astrophysical interest, and a significant discrepancy was observed with a recent compilation of Ne-19 resonance parameters.
引用
收藏
页码：557C / 560C
页数：4
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