This final article about the CHOOZ experiment presents a complete description of the electron antineutrino source and detector, the calibration methods and stability checks, the event reconstruction ...procedures and the Monte Carlo simulation. The data analysis, systematic effects and the methods used to reach our conclusions are fully discussed. Some new remarks are presented on the deduction of the confidence limits and on the correct treatment of systematic errors.
Ethambutol is said to be capable of elevating serum urate concentration. This statement was reconsidered in three investigations using strictly supervised administration of ethambutol in a single ...daily dose of 25 mg. per kg. of body weight: (1) In short term administration 10 healthy subjects received ethambutol for eight days. (2) In a pilot study 13 patients suffering from pulmonary tuberculosis were treated with a triple combination including thambutol for six months. (3) In a controlled trial 23 patients were randomly allocated to one of the following regiments: In the first group patients received ethambutol plus isoniazid plus rifampicin for six months. In the second group patients received streptomycin plus isoniazid plus PAS for three months and thereafter streptomycin plus isoniazid plus ethambutol for another three months. Serum urate concentrations and clearances of uric acid and of creatinine were determined periodically in all subjects. A slight increase in serum urate concentration occurring in long term therapy showed no relation to ethambutol administration, but was obviously dependant on parameters related to the course of the disease in form of increase in body weight and physical activity, or related to the well known syntropy of chronic alcoholism and tuberculosis.
We present new results based on the entire CHOOZ data sample. We find (at 90% confidence level) no evidence for neutrino oscillations in the anti_nue disappearance mode, for the parameter region ...given by approximately Delta m**2 > 7 x 10**-4 eV^2 for maximum mixing, and sin**2(2 theta) = 0.10 for large Delta m**2. Lower sensitivity results, based only on the comparison of the positron spectra from the two different-distance nuclear reactors, are also presented; these are independent of the absolute normalization of the anti_nue flux, the cross section, the number of target protons and the detector efficiencies.
The CHOOZ experiment measured the antineutrino flux at a distance of about 1 Km from two nuclear reactors in order to detect possible neutrino oscillations with squared mass differences as low as ...10**-3 eV**2 for full mixing. We show that the data analysis of the electron antineutrino events, collected by our liquid scintillation detector, locates the antineutrino source within a cone of half-aperture of about 18 degrees at the 68% C.L.. We discuss the implications of this experimental result for tracking down a supernova explosion.
We report the results of a search for proton decay into {ital e}{sup +}+{pi}{sup 0} in the 6800-ton IMB-3 water Cherenkov detector. During 376 days of live time no events consistent with this decay ...were found in the 3300 ton fiducial volume. From this observation we derive a limit on the partial lifetime to be {tau}/{ital B}{gt}2.4{times}10{sup 32} yr (90% C.L.), which, combined with our previous result of 3.1{times}10{sup 32} yr, provides a limit of 5.5{times}10{sup 32} yr. The general features of the observed contained events are compatible with those expected from atmospheric neutrino interactions.
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