Implications of combined solar-neutrino observations and their theoretical uncertainties

Journal Article · Mon Mar 15 00:00:00 EST 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.2220· OSTI ID:7060206

Bludman, S A; Hata, N; Kennedy, D C; Langacker, P G ^[1]

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1. Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (United States)

Constraints on the core temperature ([ital T][sub [ital c]]) of the Sun and on neutrino-oscillation parameters are obtained from the existing solar neutrino data, including the recent GALLEX, SAGE, and Kamiokande III results. (1) A purely astrophysical solution to the solar-neutrino problem is strongly disfavored by the data: the Homestake and Kamiokande data together are incompatible with any temperature in the Sun; the central values of both the SAGE and GALLEX results require a large reduction of [ital T][sub [ital c]] when they are fit to a cooler Sun. (2) Assuming the standard solar model (SSM) and matter-enhanced neutrino oscillations, the Mikheyev-Smirnov-Wolfenstein (MSW) parameters are constrained to two small regions: nonadiabatic oscillations with [Delta][ital m][sup 2]=(0.3--1.2)[times]10[sup [minus]5] eV[sup 2], sin[sup 2]2[theta]=(0.4--1.5)[times]10[sup [minus]2], or large mixing-angle oscillations with [Delta][ital m][sup 2]=(0.3--3)[times]10[sup [minus]5] eV[sup 2], sin[sup 2]2[theta]=0.6--0.9. The nonadiabatic solution gives a considerably better fit. For [nu][sub [ital e]] oscillations into sterile neutrinos, the allowed region (90% C.L.) is constrained to nonadiabatic oscillations. As long as the SSM is assumed, the neutrino mixing angles are at least four times larger, or considerably smaller, than the corresponding quark mixing angles.

• DOE Contract Number: AC02-76ER03071; FG02-88ER40479
• OSTI ID: 7060206
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 47:6; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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BERYLLIUM 7 TARGET
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HELIUM 3 TARGET
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NEUTRINO OSCILLATION
LIMITING VALUES
MIXING
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662430* - Properties of Leptons- (1992-)