Remeasurement of the 193 keV resonance in {sup 17}O(p,{alpha}){sup 14}N

Journal Article · Tue May 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.055808· OSTI ID:20995337

Newton, J R; Iliadis, C; Champagne, A E; Longland, R; Ugalde, C ^[1]

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1. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599-3255 (United States) and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)

A recently discovered resonance at 193 keV determines the thermonuclear rates of the {sup 17}O +p reactions at temperatures important for the nucleosynthesis in classical novae (T=0.1-0.4 GK). We report on a remeasurement of this resonance in the {sup 17}O(p,{alpha}){sup 14}N reaction by using a different kind of target compared to the previous study. Special emphasis is placed on Monte Carlo simulations of the experiment in order to better understand certain effects that have been disregarded previously. Our measured value of the resonance strength amounts to ({omega}{gamma}){sub p{alpha}}=(1.66{+-}0.17)x10{sup -3} eV, in agreement with the previously reported result. As a byproduct of our study, we find that the inhomogeneity of the foil placed in front of the {alpha}-particle detector determines the resolution in the pulse-height spectrum, and thus constrains the signal-to-noise ratio in searches of very weak (p,{alpha}) resonances.

• OSTI ID: 20995337
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
COMPUTERIZED SIMULATION
EV RANGE 01-10
FOILS
KEV RANGE 100-1000
MONTE CARLO METHOD
NITROGEN 14
NOVAE
NUCLEOSYNTHESIS
OXYGEN 17
RESONANCE
SIGNAL-TO-NOISE RATIO