Physics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976nciml..15..435b&link_type=abstract
Nuovo Cimento, Lettere, vol. 15, Mar. 20, 1976, p. 435-438. Research supported by the Robert A. Welch Foundation and ERDA.
Physics
Alpha Decay, Atomic Excitations, Carbon 12, Radioactive Decay, Stellar Evolution, Abundance, Branching (Physics), Energy Spectra, Gamma Rays, Ground State, Helium, Pair Production
Scientific paper
In stellar evolution, elemental build-up in the 3 alpha process takes place when two alphas form 8Be, followed by a resonant capture of a third alpha to form the second excited state in 12C. In almost all cases this excited state alpha-decays and the 12C formation process is reversed. However, once in every 2500 formations an irreversible radiative decay occurs from the second-excitation state in 12C to the ground state as a gamma cascade through the first excited state. The size of the radiative branching ratio determines the abundance of both 12C and 16O formed in alpha capture by 12C. This paper reports on a new measurement of the radiative branching ratio in the decay of the 7.65 MeV state in 12C employing a triple-coincidence technique involving the use of a proton beam to excite the second state of 12C and the detection of gamma rays from each reaction.
Braithwaite W. J.
Obst Andrew W.
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