https://doi.org/10.1140/epja/i2011-11066-7
Regular Article - Experimental Physics
Direct studies of low-energy resonances in 31P(p, α)28Si and 35Cl(p, α)32S
1
Department of Physics and Astronomy, University of Tennessee, 37996, Knoxville, TN, USA
2
Oak Ridge Associated Universities, 37831, Oak Ridge, TN, USA
3
Physics Division, Oak Ridge National Laboratory, 37831, Oak Ridge, TN, USA
4
Department of Physics, Louisiana State University, 70803, Baton Rouge, LA, USA
5
Department of Physics, Colorado School of Mines, 80401, Golden, CO, USA
6
Department of Physics and Astronomy, Rutgers University, 08854, Piscataway, NJ, USA
7
Department of Physics, Tennessee Technological University, 38505, Cookeville, TN, USA
8
Department of Physics, University of Surrey, GU2 7XH, Guilford, UK
* e-mail: brianmoazen@gmail.com
Received:
22
December
2010
Revised:
14
February
2011
Accepted:
16
April
2011
Published online:
26
May
2011
Low-energy resonances in 31P(p, α 28Si and 35Cl(p, α)32S were studied directly in order to gain a better understanding of reaction cycling in the Si-Ar region in novae. New resonance strengths at E c.m. = 600 and 622 keV in 31P(p, α)28Si were measured (ωγ p, α = (2.2#x00B1;0.7) × 10−2 eV and ωγ p, α = (0.99±0.08) eV, respectively) as well as the E c.m. = 610 keV resonance in 35Cl(p, α)32S [ωγ p, α = (1.2±0.2) × 10−2 eV], the lowest energy that any resonance in this reaction has been observed, directly or indirectly. The strengths of these resonances were found to be lower than previously determined, resulting in even weaker cycling in the Si-Ar region.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
