R. Barloutaud

Study of atmospheric neutrino interactions with the Fréjus detector

Abstract We present an analysis of the neutrino event sample recorded in the Frejus experiment. This sample which corresponds to the 1.56 kt yr final sensitivity of the experiment is compared to the predictions of a Monte Carlo neutrino simulation program. It is based on a recent calculation of the atmospheric neutrino flux at the Frejus latitude which takes into account muon polarization effects. The comparison is performed on the distributions of the visible energy, the zenith angle and the neutrino flavor. Good agreement is obtained between the data and the simulation within statistics.

Lifetime limits on (B-L)-violating nucleon decay and di-nucleon decay modes from the Fréjus experiment

The fully contained events recorded in the Frejus detector are used to search for (B-L)-violating nucleon decay and di-nucleon decay processes. No signal is found for a sensitivity of 2.0 kiloton year. The lower limits on the partial lifetime for the various nucleon decay modes range from 5.4×1030 yr for p→μ−π+K+ to 1.0×1032 yr for pn→e+n. We also quote limits on neutron and di-neutron decay into three and two neutrinos respectively.

Results from the Fréjus experiment for nucleon decay modes into anti-neutrino + meson

Abstract With the Frejus 900 ton calorimeter (550 ton fiducial), a search for nucleon decay events into anti-neutrino plus meson has been performed. No signal is found for a sensitivity of 1.3 kiloton × year. Lower lifetime limits for various decay modes range from 0.9 to 2.9 10 31 years (at 90% C.L.).

Results from the Fréjus experiment on nucleon decay modes with charged leptons

Lower limits on the nucleon lifetime in channels containing at least one positron or muon are given. The analysis is based on 4 years of data taking with the Fréjus detector. Various approaches to determine the background from atmospheric neutrinos are discussed and two different nuclear models are used in event simulations. The limits obtained range from 1031 years forp→e+K*0 to 1.5·1032 years forp→e+K*0 to 1.5·1032 years forp→µ+γ.

A search for high energy neutrinos from SN 1987A, the Carb, Hercules X-1, and Cygnus X-3 with the Fréjus detector

AbstractWith the Fréjus detector we studied four astrophysical point-like sources by usingn

Status of the Fréjus experiment and preliminary results on contained events

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Experimental study of muon bundles observed in the Fréjus detector.

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