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 Physical Review Letters 108 (2012) 162502
 Precise Determination of the Unperturbed 8B Neutrino Spectrum
 (2012)
 A measurement of the final state distribution of the 8B $\beta$ decay, obtained by implanting a 8B beam in a double-sided silicon strip detector, is reported here. The present spectrum is consistent with a recent independent precise measurement performed by our collaboration at the IGISOL facility, Jyvâskylä [O. S. Kirsebom et al., Phys. Rev. C 83, 065802 (2011)]. It shows discrepancies with previously measured spectra, leading to differences in the derived neutrino spectrum. Thanks to a low detection threshold, the neutrino spectrum is for the first time directly extracted from the measured final state distribution, thus avoiding the uncertainties related to the extrapolation of R-matrix fits. Combined with the IGISOL data, this leads to an improvement of the overall errors and the extension of the neutrino spectrum at high energy. The new unperturbed neutrino spectrum represents a benchmark for future measurements of the solar neutrino flux as a function of energy.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 in2p3-00690984, version 1 http://hal.in2p3.fr/in2p3-00690984 oai:hal.in2p3.fr:in2p3-00690984 Contributeur : Michel Lion <> Déposé pour le compte de : Thomas Roger <> Soumis le : Mercredi 25 Avril 2012, 09:14:10 Dernière modification le : Mercredi 25 Avril 2012, 09:37:56