Published September 1985
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Neutrino oscillation effect observed near a Bugey PWR reactor
Description
The energy spectrum of electron antineutrinos has been measured at two distances, 13.60 and 18.30 meters from the core of a PWR power reactor at Bugey. About 100 000 neutrino-induced events were detected by a detector based on the inverse Beta decay reaction antiνsub(e) + p → n + e+. We have observed a neutrino disappearance of 8.2 % +- 1.4 % stat +- 26 % syst at the second position (18.30 m) as compared to the first position. An interpretation of this integrated counting difference between the two positions by a simple two-neutrino oscillation scheme exclude the no-oscillation case at the 2.3σ Level. The parameters of neutrino oscillation deduced from our analysis are: sin2 2theta = 0.25 and deltam2 = 0.20 ev2
Availability note (English)
MF available from INIS under the Report Number.Abstract (French)
Ce memoire rapporte les resultats de l'experience de recherche d'oscillations neutrino realisee aupres d'un reacteur de puissance du type PWR de la centrale nucleaire du Bugey. Le spectre en energie des antineutrinos antiνsub(e) issus du reacteur a ete mesure a deux distances source-detecteur, 13,63 m pour la premiere position et 18,3 m pour la deuxieme position. Ainsi plus de 100 000 evenements ont ete enregistres par le detecteur dont le principe est base sur la reaction inverse de la desintegration β du neutron antiνsub(e) + p → n + e+. Nous observons une disparition de neutrinos de 8,22 % +- 3 % a la deuxieme position qui pourrait etre induite par des oscillations de antiνsub(e) en neutrinos steriles pour la reaction antiνsub(e) - p. L'interpretation de cette difference de taux de comptage entre la premiere et la deuxieme position par un modele simple d'oscillations a deux neutrinos, exclut l'absence d'oscillations neutrino a 2.3 σ. Les parametres d'oscillations deduits de nos analyses et en tenant compte des resultats des autres experiences sont: sin2 2theta = 0,25 et deltam2 = 0,20 ev2Files
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Additional details
Additional titles
- Original title (French)
- Effet d'oscillations neutrino observe aupres d'un reacteur PWR du Bugey
Publishing Information
- Imprint Pagination
- 176 p.
- Report number
- ISN--85-44
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 18011970
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- DATA ACQUISITION; DATA PROCESSING; DISTANCE; ELECTRON ANTINEUTRINOS; ENERGY SPECTRA; MASS DIFFERENCE; NEUTRINO DETECTION; NEUTRINO OSCILLATION; POSITRONS; POWER REACTORS; PWR TYPE REACTORS; WEINBERG ANGLE
- Descriptors DEC
- ANTILEPTONS; ANTIMATTER; ANTINEUTRINOS; ANTIPARTICLES; DETECTION; ELECTRON NEUTRINOS; ELEMENTARY PARTICLES; ENRICHED URANIUM REACTORS; FERMIONS; LEPTONS; MASSLESS PARTICLES; MATTER; NEUTRINOS; PARTICLE PROPERTIES; RADIATION DETECTION; REACTORS; SPECTRA; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS