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Precise Determination of the Unperturbed B8 Neutrino Spectrum
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2012 (English)In: Phys. Rev. Lett., Vol. 108Article in journal (Refereed) Published
Abstract [en]

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, Jyvaskyla [O. S.Kirsebom et al., Phys. Rev. C 83, 065802 (2011)]. It shows discrepancies with previously measuredspectra, leading to differences in the derived neutrino spectrum. Thanks to a low detection threshold, theneutrino spectrum is for the first time directly extracted from the measured final state distribution, thusavoiding 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 highenergy. The new unperturbed neutrino spectrum represents a benchmark for future measurements of thesolar neutrino flux as a function of energy.

Place, publisher, year, edition, pages
2012. Vol. 108
National Category
Astronomy, Astrophysics and Cosmology Subatomic Physics
Research subject
Nuclear Physics
URN: urn:nbn:se:uu:diva-221520DOI: 10.1103/PhysRevLett.108.162502OAI: oai:DiVA.org:uu-221520DiVA: diva2:709250
Available from: 2014-04-01 Created: 2014-04-01 Last updated: 2014-04-01

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevLett.108.162502

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