6533b861fe1ef96bd12c4ff0
RESEARCH PRODUCT
Absence of a day-night asymmetry in the7Be solar neutrino rate in Borexino
A. EtenkogW. ManeschgCristiano GalbiatiLothar OberauerR. SaldanhaG. TesteraMarco GiammarchiLaura CadonatiAndrea IanniD. BickSandra ZavatarelliL. PappMatthias LaubensteinA. SotnikovD. VignaudM. D. SkorokhvatovA. PocarMichael WurmL. GrandiJ. WinterS. HardyD. FrancoM. Göger-neffT. LewkeD. KrynB. CaccianigaLivia LudhovaR. B. VogelaarA. M. GorettiFausto OrticaS. DavinicQ. MeindlY. SuvorovY. SuvorovC. CarraroA. DerbinmE. MeroniStefano BonettiDenis KorablevMarcin WójcikE. LitvinovichS. GazzanaF. LombardiS. SchoenertC. SalvoJilei XuO. SmirnovAlessandra ReA. RazetoF. Von FeilitzschG. BelliniI. N. MachulinMarco PallaviciniS. ManeckiJay Burton BenzigerAldo IanniD. D'angeloAldo RomaniA. E. ChavarriaL. PerassoG. ZuzelCarlos Pena-garayR. S. RaghavanLino MiramontiS. PerassoG. ManuzioB. LoerYusuke KoshioG. KorgaK. FomenkoG. BonfiniM. Buizza AvanziniFrank CalapriceHardy SimgenP. J. MosteiroC. GhianoP. CavalcanteM. MisiaszekV. N. MuratovaD. MontanariGioacchino RanucciE. GuardincerriA. A. SabelnikovM. ObolenskyPaolo LombardiS. V. SukhotinA. WrightO. ZaimidorogaV. V. KobychevR. Tartagliasubject
Particle physicsNuclear and High Energy PhysicsNeutrino oscillationPhysics::Instrumentation and Detectorsmedia_common.quotation_subjectSolar neutrino01 natural sciencesAsymmetrySolar neutrinoNuclear physicsDay-night effect0103 physical sciences010306 general physicsNeutrino oscillationNuclear Experimentday–night effectBorexinomedia_commonPhysicsneutrino oscillations010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyFísicaSolar neutrino problemNeutrino detectorsolar neutrinosMeasurements of neutrino speedHigh Energy Physics::ExperimentNeutrinoCPT violationdescription
We report on a search for the day-night asymmetry of the Be-7 solar neutrino rate measured by Borexino at the Laboratori Nazionali del Gran Sasso (LNGS), Italy. The measured value, Adn=0.001 +- 0.012 (stat) +- 0.007 (syst), shows the absence of a significant asymmetry. This result alone rejects the so-called LOW solution at more than 8.5 sigma. Combined with the other solar neutrino data, it isolates the Large Mixing Angle (LMA) -- MSW solution at DeltaChi2 > 190 without relying on the assumption of CPT symmetry in the neutrino sector. We also show that including the day-night asymmetry, data from Borexino alone restricts the MSW neutrino oscillations to the LMA solution at 90% confidence level.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-01 |