Abstract
By measuring the , , and reactions, the level scheme of has been refined and extended up to MeV. A total of 17 new levels, and 5 tentative new levels, have been measured. In addition, 5 tentatively known levels have been confirmed. The uncertainties in the excitation energies of many known levels have been reduced substantially. Spin constraints have been made for 8 proton-unbound levels by measuring 18 triton-proton angular correlations from the reaction. Finite proton-decay branching ratios (including discrimination between decays to the ground state and first two excited states of ) have been measured for 38 levels, and upper limits have been set for 3 additional levels. The lowest isospin level has been observed, and candidates for the second and third levels have been identified. The new experimental information on resonance parameters has been used together with data from previous measurements to calculate the thermonuclear, resonant reaction rate over three orders of magnitude in temperature: GK. Good agreement is found with estimates based on Hauser-Feshbach statistical models over the range GK, but differences are found with rates previously estimated using the experimental information at hand.
2 More- Received 21 December 2008
DOI:https://doi.org/10.1103/PhysRevC.79.045803
©2009 American Physical Society
Synopsis
Nuclear star gazing
Published 13 April 2009
The study of reaction rates between unstable, light nuclei can lead to a better understanding of thermonuclear processes in massive stars and novae.
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