dorsal/arxiv
View SchemaA new analysis of 14O beta decay: branching ratios and CVC consistency
| Authors | I. S. Towner, J. C. Hardy |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0508039 |
| URL | https://arxiv.org/abs/nucl-th/0508039 |
| DOI | 10.1103/PhysRevC.72.055501 |
| Journal | Phys.Rev. C72 (2005) 055501 |
Abstract
The ground-state Gamow-Teller transition in the decay of 14O is strongly hindered and the electron spectrum deviates markedly from the allowed shape. A reanalysis of the only available data on this spectrum changes the branching ratio assigned to this transition by seven standard deviations: our new result is (0.54 \pm 0.02)%. The Kurie plot data from two earlier publications are also examined and a revision to their published branching ratios is recommended. The required nuclear matrix elements are calculated with the shell model and, for the first time, consistency is obtained between the M1 matrix element deduced from the analog gamma transition in 14N and that deduced from the slope of the shape-correction function in the beta transition, a requirement of the conserved vector current hypothesis. This consistency is only obtained, however, if renormalized rather than free-nucleon operators are used in the shell-model calculations. In the mirror decay of 14C a similar situation occurs. Consistency between the 14C lifetime, the slope of the shape-correction function and the M1 matrix element from gamma decay can only be achieved with renormalized operators in the shell-model calculation.
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"abstract": "The ground-state Gamow-Teller transition in the decay of 14O is strongly\nhindered and the electron spectrum deviates markedly from the allowed shape. A\nreanalysis of the only available data on this spectrum changes the branching\nratio assigned to this transition by seven standard deviations: our new result\nis (0.54 \\pm 0.02)%. The Kurie plot data from two earlier publications are also\nexamined and a revision to their published branching ratios is recommended. The\nrequired nuclear matrix elements are calculated with the shell model and, for\nthe first time, consistency is obtained between the M1 matrix element deduced\nfrom the analog gamma transition in 14N and that deduced from the slope of the\nshape-correction function in the beta transition, a requirement of the\nconserved vector current hypothesis. This consistency is only obtained,\nhowever, if renormalized rather than free-nucleon operators are used in the\nshell-model calculations. In the mirror decay of 14C a similar situation\noccurs. Consistency between the 14C lifetime, the slope of the shape-correction\nfunction and the M1 matrix element from gamma decay can only be achieved with\nrenormalized operators in the shell-model calculation.",
"arxiv_id": "nucl-th/0508039",
"authors": [
"I. S. Towner",
"J. C. Hardy"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.72.055501",
"journal_ref": "Phys.Rev. C72 (2005) 055501",
"title": "A new analysis of 14O beta decay: branching ratios and CVC consistency",
"url": "https://arxiv.org/abs/nucl-th/0508039"
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