6533b7d1fe1ef96bd125cb90
RESEARCH PRODUCT
Precise Determination of the UnperturbedB8Neutrino Spectrum
Leandro GasquesP. Van DuppenM. Carmona-gallardoE. TraykovPraveen ShidlingMarc HuyseK. RiisagerÁNgel PereaMattias LantzM. SohaniJ. BüscherThomas Elias CocoliosG. S. GiriRiccardo RaabeJoão CruzB. BastinM. AlcortaW.l. KruithofOliver S. KirsebomD. GalavizD. GalavizJuha ÄYstöB. SantraS. HyldegaardM. J. G. BorgeA.j. SorensenH. O. U. FynboPeter DendoovenOlof TengbladL. M. FraileOscar VersolatoT. RogerKlaus-peter JungmannH. W. WilschutAntti SaastamoinenD.j. Van Der Hoeksubject
PhysicsParticle physicsPhysics::Instrumentation and Detectors010308 nuclear & particles physicsSolar neutrinoExtrapolationGeneral Physics and AstronomyFlux01 natural sciencesBeta decaySpectral line0103 physical sciencesMeasurements of neutrino speedNeutrino010306 general physicsNeutrino oscillationdescription
A measurement of the final state distribution of the B-8 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 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-04-18 | Physical Review Letters |