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AbstractAbstract
[en] The 29P(p,γ)30S 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+ and 2+ resonances above the 30S proton threshold at 4399 keV. To better understand the 29P(p,γ)30S rate, we have studied the 30S nucleus with the 32S(p,t)30S reaction. We have observed 13 30S levels, nine of which are above the proton threshold, including a level at 4704 keV that is a candidate to be the important 3+ 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 29P(p,γ)30S reaction rate is approximately six times larger at nova temperatures than previously thought
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Source
(c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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ABUNDANCE, ANGULAR MOMENTUM, BARYON REACTIONS, BARYONS, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, CHARGED PARTICLES, CHARGED-PARTICLE REACTIONS, DISTRIBUTION, ELEMENTARY PARTICLES, ENERGY RANGE, ENERGY-LEVEL TRANSITIONS, FERMIONS, HADRON REACTIONS, HADRONS, ISOTOPES, KINETICS, LIGHT NUCLEI, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, NUCLEONS, ODD-EVEN NUCLEI, PARTICLE PROPERTIES, PHOSPHORUS ISOTOPES, RADIOISOTOPES, REACTION KINETICS, SECONDS LIVING RADIOISOTOPES, TARGETS
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