³⁰S Studied with the ³²S(p,t)³⁰S Reaction and the ²⁹P(p,{gamma})³⁰S Reaction Rate

Journal Article · Mon Jan 01 04:00:00 EST 2007 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.76.045803· OSTI ID:932058

Bardayan, Daniel W ^[1]; Blackmon, Jeff C ^[1]; Fitzgerald, Ryan ^[1]; Hix, William Raphael ^[1]; Grzywacz-Jones, Kate L ^[1]; KOZUB, RAYMOND L ^[1]; Liang, J Felix ^[1]; Livesay, Jake ^[1]; Ma, Zhanwen ^[1]; Roberts, Luke F ^[1]; Smith, Michael Scott ^[1]; Thomas, Jeffrey S ^[1]; Visser, Dale William ^[1]

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1. ORNL

The 29P(p,gamma)30S rate affects interpretation of nova Si abundances, which have been precisely measured in presolar grains. The rate is thought to be dominated by previously unobserved 3+ and 2+ resonances above the 30S proton threshold at 4400 keV. To better understand the 29P(p,gamma)30S rate, we have studied the 30S nucleus with the 32S(p,t)30S reaction. We have observed 13 30S levels - 9 of which are above the proton threshold including a level at 4704 keV that is a candidate to be the important 3+ resonance. From the observed triton angular distributions, we additionally constrain the spins of several levels. Using our updated information, we estimate the 29P(p,gamma)30S reaction rate is approximately six times larger at nova temperatures than previously thought.

• Research Organization: Oak Ridge National Laboratory (ORNL); Holifield Radioactive Ion Beam Facility
• Sponsoring Organization: ORNL LDRD Director's R&D; SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 932058
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

(p
30s
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
PHOSPHORUS 29
PROTONS
REACTION KINETICS
RESONANCE
SULFUR ISOTOPES
nova
silicon
sulfur
t)