# Precise Determination of the Unperturbed 8B Neutrino Spectrum

Abstract : 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00690984
Contributor : Michel Lion <>
Submitted on : Wednesday, April 25, 2012 - 9:14:10 AM
Last modification on : Friday, November 6, 2020 - 12:22:07 PM

### Citation

T. Roger, J. Büscher, B. Bastin, O.S. Kirsebom, R. Raabe, et al.. Precise Determination of the Unperturbed 8B Neutrino Spectrum. Physical Review Letters, American Physical Society, 2012, 108, pp.162502. ⟨10.1103/PhysRevLett.108.162502⟩. ⟨in2p3-00690984⟩

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