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29 March 2024
 
  » arxiv » nucl-ex/0308008

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Particle decay branching ratios for states of astrophysical importance in 19Ne
D. W. Visser ; J. A. Caggiano ; R. Lewis ; W. B. Handler ; A. Parikh ; P. D. Parker ;
Date 8 Aug 2003
Journal Phys.Rev. C69 (2004) 048801
Subject nucl-ex
AbstractWe have measured proton and alpha-particle branching ratios of excited states in 19Ne formed using the 19F(3He,t) reaction at a beam energy of 25 MeV. These ratios have a large impact on the astrophysical reaction rates of 15O(alpha,gamma), 18F(p,gamma) and 18F(p,alpha), which are of interest in understanding energy generation in x-ray bursts and in interpreting anticipated gamma-ray observations of novae. We detect decay protons and alpha-particles using a silicon detector array in coincidence with tritons measured in the focal plane detector of our Enge split-pole spectrograph. The silicon array consists of five strip detectors of the type used in the Louvain-Edinburgh Detector Array, subtending angles from 130 degrees to 165 degrees with approximately 14% lab efficiency. The correlation angular distributions give additional confidence in some prior spin-parity assignments that were based on gamma branchings. We measure Gamma_p/Gamma=0.387+-0.016 for the 665 keV proton resonance, which agrees well with the direct measurement of Bardayan et al.
Source arXiv, nucl-ex/0308008
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