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Initial Results from the CHOOZ Long Baseline Reactor Neutrino Oscillation Experiment
Physics letters. B, v 420(3), pp 397-404
05 Nov 1997
Abstract
Initial results are presented from CHOOZ, a long-baseline reactor-neutrino vacuum-oscillation experiment. Electron antineutrinos were detected by a liquid scintillation calorimeter located at a distance of about 1 km. The detector was constructed in a tunnel protected from cosmic rays by a 300 MWE rock overburden. This massive shielding strongly reduced potentially troublesome backgrounds due to cosmic-ray muons, leading to a background rate of about one event per day, more than an order of magnitude smaller than the observed neutrino signal. From the statistical agreement between detected and expected neutrino event rates, we find (at 90% confidence level) no evidence for neutrino oscillations in the electron antineutrino disappearance mode for the parameter region given approximately by deltam**2 > 0.9 10**(-3) eV**2 for maximum mixing and (sin(2 theta)**2) > 0.18 for large deltam**2.
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Details
- Title
- Initial Results from the CHOOZ Long Baseline Reactor Neutrino Oscillation Experiment
- Creators
- M. Apollonio - INFN Sezione di TriesteA. Baldini - INFN Sezione di PisaC. Bemporad - INFN Sezione di PisaE. Caffau - INFN Sezione di TriesteFabrizio Cei - INFN Sezione di PisaY. Déclais - Laboratoire d'Annecy-le-Vieux de Physique des ParticulesH. KerretB. Dieterle - University of New MexicoA. Etenko - Kurchatov InstituteJ. George - University of New MexicoG. Giannini - INFN Sezione di TriesteM. Grassi - INFN Sezione di PisaY. Kozlov - Kurchatov InstituteW. Kropp - University of California, IrvineD. Kryn - Collège de FranceM. Laiman - Laboratoire d'Annecy-le-Vieux de Physique des ParticulesCe Lane - Drexel UniversityB. Lefièvre - Collège de FranceI. Machulin - Kurchatov InstituteA. Martemyanov - Kurchatov InstituteV. Martemyanov - Kurchatov InstituteL. Mikaelyan - Kurchatov InstituteDonato Nicolo - INFN Sezione di PisaM. Obolensky - Collège de FranceR. Pazzi - INFN Sezione di PisaG. Pieri - INFN Sezione di PisaL. Price - University of California, IrvineS. Riley - University of California, IrvineR. Reeder - University of New MexicoA. Sabelnikov - Kurchatov InstituteG. Santin - INFN Sezione di TriesteM. Skorokhvatov - Kurchatov InstituteH. Sobel - University of California, IrvineJ. Steele - Drexel UniversityR. Steinberg - Drexel UniversityS. Sukhotin - Kurchatov InstituteS. Tomshaw - Drexel UniversityD. Veron - Collège de FranceV. Vyrodov - Collège de FranceMercia M T Grassi - [Retired Faculty]
- Publication Details
- Physics letters. B, v 420(3), pp 397-404
- Publisher
- Elsevier
- Resource Type
- Other
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:000073077700023
- Scopus ID
- 2-s2.0-0039447815
- Other Identifier
- 991019168370904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics
- Physics, Nuclear
- Physics, Particles & Fields