Solar neutrinos observed by GALLEX at Gran Sasso

doi:10.1016/0920-5632(93)90122-M

Nuclear Physics B - Proceedings Supplements

Volume 31, April 1993, Pages 117-124

presented by T. Kirsten

https://doi.org/10.1016/0920-5632(93)90122-M Get rights and content

Abstract

We have measured the rate of production of ⁷¹Ge from ⁷¹Ga by solar neutrinos. The target consists of 30.3 t of gallium in the form of 8.13 M aqueous chloride solution (101 t), shielded by ≈ 3300 m water equivalent of standard rock in the Gran Sasso Underground Laboratory (Italy). In nearly one year of operation, 14 measurements of the production rate of ⁷¹Ge were carried out to give, after corrections for side reactions and other backgrounds, an average value of 83±19 (stat.)±8 (syst.) SNU (1σ) due to solar neutrinos. This conclusion constitutes the first observation of solar pp neutrinos. Our result is consistent with the presence of the full pp neutrino flux expected according to the “standard solar model” together with a reduced flux of ⁸B+⁷Be neutrinos as observed in the Homestake and Kamiokande experiments. Astrophysical reasons remain as a possible explanation of the solar neutrino problem. On the other hand, if the result is to be interpreted in terms of the MSW effect, it would fix neutrino masses and mixing angles within a very restricted range.

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^∗

This work has been supported by the German Federal Minister for Research and Technology (BMFT) under the contract number 06HD5541. This work has been generously supported by the ALFRIED KRUPP von BOHLEN und HALBACH-Foundation, Germany.

This work has been supported by Istituto Nazionale di Fisica Nucleare (INFN), Italy, by Commissariat à l'Énergie Atomique, France, and by the Office of Nuclear Physics of the US Department of Energy.

⁺: Present address: Max-Planck-Institut für Physik, Föhringer Ring 6, Postfach 401212, W-8000 Munich 40, Germany

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Nuclear Physics B - Proceedings Supplements

Abstract

References (23)

Phys. Lett. B

Neutrino 90

Nucl. Phys. B (Proc. Suppl.)

Phys. Lett. B

Nucl. Instrum. Meth.

Phys. Rev. D.

Nuovo Cimento

Sov. Phys. JETP

Phys. Rev. C

Cited by (8)

Measurements of <sup>8</sup>B Solar Neutrinos - Results and Prospects from SNO and SuperKamiokande

Results from Solar and Reactor Neutrino Experiments

Solar neutrinos

JUNO sensitivity to <sup>7</sup>Be, pep, and CNO solar neutrinos

JUNO sensitivity to <sup>7</sup>Be, pep, and CNO solar neutrinos

Overview of Solar Neutrino Experiments