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Published November 1, 1986 | public
Journal Article Open

Neutrino-oscillation experiments at the Gösgen nuclear power reactor


A search for neutrino oscillations has been conducted at the 2800-MW (thermal) nuclear power reactor in Gösgen (Switzerland), providing 5×10^20 electron antineutrinos per second. The energy spectrum of the antineutrinos was measured at three distances, 37.9, 45.9, and 64.7 m, from the reactor core. The detection of the neutrinos is based on the reaction ν¯e+p→e++n. Roughly 10^4 antineutrinos were registered at each of the three measuring positions. The measured spectra are analyzed in terms of a two-neutrino oscillation model and the results are represented as exclusion plots for the oscillation parameters Δm^2 and sin^2(2theta). Two analyses are performed: Analysis A relies exclusively on the data measured at the three different distances; analysis B combines the measured data with additional information, in particular with the reactor antineutrino spectrum as derived from independent β-spectroscopic measurements. Both analyses show that the data are consistent with the absence of neutrino oscillations, and rule out large regions of parameters (Δm2,theta). The resulting limits on the oscillation parameters are Δm^2<0.019 eV^2 (90% C.L.) for maximum mixing and sin^2(2theta)<0.21 (90% C.L.) for Δm^2>5 eV^2.

Additional Information

©1986 The American Physical Society Received 3 April 1986 We would like to thank the Aare-Tesin Elektrizität and the Kernkraftwerk Gösgen-Däniken AG for their continuous hospitality. G. Meier and W. Sauser have provided us with the necessary reactor data. Contributions from J. Langhans, E. Baumann, and R. Portmann are gratefully acknowledged. Discussions with P. Vogel and K. Schreckenbach were much appreciated. Early contributions of J. Egger, L. Meier, F. Pozar, and P. Tosolini are appreciated. The hospitality of the CERN EP Division is much appreciated. Financial support was obtained from the U.S. Department of Energy and from the Bundesministerium für Forschung und Technolgie of the Federal Republic of Germany.


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