dorsal/arxiv
View SchemaCross Section Uncertainties in the Gallium Neutrino Source Experiments
| Authors | W. C. Haxton |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9804011 |
| URL | https://arxiv.org/abs/nucl-th/9804011 |
| DOI | 10.1016/S0370-2693(98)00581-4 |
| Journal | Phys.Lett.B431:110-118,1998 |
Abstract
The 51Cr neutrino source experiments play a unique role in testing overall operations of the GALLEX and SAGE solar neutrino experiments. Recently Hata and Haxton argued that the excited-state contribution to the 71Ga cross section for 51Cr neutrino absorption might not be known reliably, despite forward-angle (p,n) measurements. A large-basis shell model calculation reported here indicates that the unusual situation they envisioned - destructive interference between weak spin and strong spin-tensor amplitudes - does occur for the transition to the first excited state in 71Ge. The calculation provides a counterexample to procedures previously used to determine the 51Cr cross section: the predicted (p,n) cross section for this state agrees with experiment, while the BGT value is well outside the accepted 3-standard-deviation limit. The results argue for a shift in the interpretation of the source experiments: they become more crucial as measurements of the 71Ga detector response to 7Be solar neutrinos, and less definitive as wholly independent tests of 71Ge recovery and counting efficiencies.
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"abstract": "The 51Cr neutrino source experiments play a unique role in testing overall\noperations of the GALLEX and SAGE solar neutrino experiments. Recently Hata and\nHaxton argued that the excited-state contribution to the 71Ga cross section for\n51Cr neutrino absorption might not be known reliably, despite forward-angle\n(p,n) measurements. A large-basis shell model calculation reported here\nindicates that the unusual situation they envisioned - destructive interference\nbetween weak spin and strong spin-tensor amplitudes - does occur for the\ntransition to the first excited state in 71Ge. The calculation provides a\ncounterexample to procedures previously used to determine the 51Cr cross\nsection: the predicted (p,n) cross section for this state agrees with\nexperiment, while the BGT value is well outside the accepted\n3-standard-deviation limit. The results argue for a shift in the interpretation\nof the source experiments: they become more crucial as measurements of the 71Ga\ndetector response to 7Be solar neutrinos, and less definitive as wholly\nindependent tests of 71Ge recovery and counting efficiencies.",
"arxiv_id": "nucl-th/9804011",
"authors": [
"W. C. Haxton"
],
"categories": [
"nucl-th",
"astro-ph",
"hep-ph"
],
"doi": "10.1016/S0370-2693(98)00581-4",
"journal_ref": "Phys.Lett.B431:110-118,1998",
"title": "Cross Section Uncertainties in the Gallium Neutrino Source Experiments",
"url": "https://arxiv.org/abs/nucl-th/9804011"
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