Measurement of partial muon capture rates in 1s-0d shell nuclei
1999
15 pages
Published in:
- Phys.Rev.C 60 (1999) 055501
Citations per year
Abstract: (APS)
We report yields for 38 γ-ray lines and 29 (μ−,ν) transitions following negative muon capture on 24Mg, 28Si, 31P, and 32S. Our results substantially increase the world data set for partial (μ−,ν) transitions on 1s−0d shell nuclei. They also resolve a number of inconsistencies between previously published γ-ray yields and accepted γ-decay branching ratios. We compare the measured capture rates for the allowed Gamow-Teller (GT) transitions (supplemented with earlier 23Na data) with a shell model calculation using the full 1s−0d space and universal SD interaction. We find a “best fit” value of the effective weak axial coupling of ga=−0.91−0.17+0.15, fair agreement for the per-target summed GT capture rates, but poor agreement for the individual GT capture rates. By replacing the shell model στ± matrix element values with experimentally determined στ± matrix element values, improved predictions for the individual GT capture rates are obtained. Last, we comment on recent determinations of the weak coupling gp via muon capture on 1s−0d shell nuclei.- muon nucleus: capture
- magnesium
- silicon
- phosphorus
- sulfur
- neutrino: emission
- excited nucleus
- energy levels: transition
- photon: yield
- energy levels: hyperfine structure
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