{sup 30}S studied with the {sup 32}S(p,t){sup 30}S reaction and the {sup 29}P(p,{gamma}){sup 30}S reaction rate

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

DOI:https://doi.org/10.1103/PHYSREVC.76.045803· OSTI ID:21067846

Bardayan, D W; Blackmon, J C; Liang, J F; Roberts, L F; Smith, M S ^[1]; Fitzgerald, R P; Visser, D W ^[2]; Hix, W R ^[1]; Jones, K L; Thomas, J S ^[3]; Kozub, R L ^[4]; Livesay, R J ^[5]; Ma, Z ^[6]

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1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
2. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27599 (United States)
3. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854-8019 (United States)
4. Physics Department, Tennessee Technological University, Cookeville, Tennessee 38505 (United States)
5. Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States)
6. Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States)

The {sup 29}P(p,{gamma}){sup 30}S reaction rate affects the interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3{sup +} and 2{sup +} resonances above the {sup 30}S proton threshold at 4399 keV. To better understand the {sup 29}P(p,{gamma}){sup 30}S rate, we have studied the {sup 30}S nucleus with the {sup 32}S(p,t){sup 30}S reaction. We have observed 13 {sup 30}S levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3{sup +} resonance. We also resolve a significant discrepancy between previously published excitation energies. From the observed triton angular distributions, we constrain the spins of several levels, ruling out several previous hypotheses and constraining some for the first time. Using our updated information, we estimate the {sup 29}P(p,{gamma}){sup 30}S reaction rate is approximately six times larger at nova temperatures than previously thought.

• OSTI ID: 21067846
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ELEMENT ABUNDANCE
ENERGY LEVELS
EXCITATION
KEV RANGE
NUCLEAR REACTION KINETICS
NUCLEAR STRUCTURE
PHOSPHORUS 29
PROTON REACTIONS
PROTONS
RESONANCE
SPIN
SULFUR 32 TARGET
TRITONS