Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 9: Particle-Astrophysics I, Neutrinos, Dark Matter

HK 9.1: Group Report

Monday, March 16, 1998, 14:00–14:30, G

Measurement of Solar Neutrinos at Low Energies with BOREXINO — •R. v.Hentig —
Techn. Universität München, Phys. Dep. E15, James-Franck Str.,
D-85748 Garching; SFB-375 Teilchen- Astrophysik

BOREXINO one experiment of the forthcoming generation of solar neutrino experiments is dedicated to the measurement of Be neutrinos in the low energy range of the solar neutrino spectrum [1]. The monoenergetic Be neutrinos may be the key to the longstanding solar neutrino puzzle and give hints to non standard neutrino properties. The detector is designed to measure the Be neutrinos which interact by neutrino-electron scattering in a target of 100t liquid scintillator. As the expected event rate is in the order of 50 events/day predicted by standard solar models the detector has to be shielded from natural and cosmogenic radioactivity [2]. The radiopurity of the detector components was shown to be in the requested range for BOREXINO by a prototype detector and ultra trace analysis.

[1] BOREXINO Collaboration, ’BOREXINO Project, The Counting Test Facility, its results and the BOREXINO design’, internal report to the INFN Jul. 1995

[2] J.N.Bahcall, M.H.Pinsonneault, Rev. Mod. Phys. 64, 885 (1992) *this work was supported by the BMBF, the Sonderforschungsbereich 375 and the accelerator laboratory, Garching.