dorsal/arxiv
View SchemaStandard Neutrino Spectrum from B-8 Decay
| Authors | John N. Bahcall, E. Lisi, D. E. Alburger, L. De Braeckeleer, S. J. Freedman, J. Napolitano |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9601044 |
| URL | https://arxiv.org/abs/nucl-th/9601044 |
| DOI | 10.1103/PhysRevC.54.411 |
| Journal | Phys.Rev.C54:411-422,1996 |
Abstract
We present a systematic evaluation of the shape of the neutrino energy spectrum produced by beta-decay of $^8$B. We place special emphasis on determining the range of uncertainties permitted by existing laboratory data and theoretical ingredients (such as forbidden and radiative corrections). We review and compare the available experimental data on the $^8$B$(\beta^+){}^8$Be$(2\alpha)$ decay chain. We analyze the theoretical and experimental uncertainties quantitatively. We give a numerical representation of the best-fit (standard-model) neutrino spectrum, as well as two extreme deviations from the standard spectrum that represent the total (experimental and theoretical) effective $\pm3\sigma$ deviations. Solar neutrino experiments that are currently being developed will be able to measure the shape of the $^8$B neutrino spectrum above about 5 MeV. An observed distortion of the $^8$B solar neutrino spectrum outside the range given in the present work could be considered as evidence, at an effective significance level greater than three standard deviations, for physics beyond the standard electroweak model. We use the most recent available experimental data on the Gamow--Teller strengths in the $A=37$ system to calculate the $^8$B neutrino absorption cross section on chlorine: $\sigma_{\rm Cl}=(1.14\pm0.11)\times10^{-42}$~cm$^2$ ($\pm3\sigma$ errors). The chlorine cross section is also given as a function of the neutrino energy. The $^8$B neutrino absorption cross section in gallium is $\sigma_{\rm Ga}=(2.46^{+2.1}_{-1.1})\times10^{-42}$ cm$^2$ ($\pm3\sigma$ errors).
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"abstract": "We present a systematic evaluation of the shape of the neutrino energy\nspectrum produced by beta-decay of $^8$B. We place special emphasis on\ndetermining the range of uncertainties permitted by existing laboratory data\nand theoretical ingredients (such as forbidden and radiative corrections). We\nreview and compare the available experimental data on the\n$^8$B$(\\beta^+){}^8$Be$(2\\alpha)$ decay chain. We analyze the theoretical and\nexperimental uncertainties quantitatively. We give a numerical representation\nof the best-fit (standard-model) neutrino spectrum, as well as two extreme\ndeviations from the standard spectrum that represent the total (experimental\nand theoretical) effective $\\pm3\\sigma$ deviations. Solar neutrino experiments\nthat are currently being developed will be able to measure the shape of the\n$^8$B neutrino spectrum above about 5 MeV. An observed distortion of the $^8$B\nsolar neutrino spectrum outside the range given in the present work could be\nconsidered as evidence, at an effective significance level greater than three\nstandard deviations, for physics beyond the standard electroweak model. We use\nthe most recent available experimental data on the Gamow--Teller strengths in\nthe $A=37$ system to calculate the $^8$B neutrino absorption cross section on\nchlorine: $\\sigma_{\\rm Cl}=(1.14\\pm0.11)\\times10^{-42}$~cm$^2$ ($\\pm3\\sigma$\nerrors). The chlorine cross section is also given as a function of the neutrino\nenergy. The $^8$B neutrino absorption cross section in gallium is $\\sigma_{\\rm\nGa}=(2.46^{+2.1}_{-1.1})\\times10^{-42}$ cm$^2$ ($\\pm3\\sigma$ errors).",
"arxiv_id": "nucl-th/9601044",
"authors": [
"John N. Bahcall",
"E. Lisi",
"D. E. Alburger",
"L. De Braeckeleer",
"S. J. Freedman",
"J. Napolitano"
],
"categories": [
"nucl-th",
"astro-ph",
"hep-ph",
"nucl-ex"
],
"doi": "10.1103/PhysRevC.54.411",
"journal_ref": "Phys.Rev.C54:411-422,1996",
"title": "Standard Neutrino Spectrum from B-8 Decay",
"url": "https://arxiv.org/abs/nucl-th/9601044"
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