Search for the lepton-family-number nonconserving decay \mu -> e + \gamma

The MEGA experiment, which searched for the muon- and electron-number violating decay \mu -> e + \gamma, is described. The spectrometer system, the calibrations, the data taking procedures, the data analysis, and the sensitivity of the experiment are discussed. The most stringent upper limit on the branching ratio of \mu -> e + \gamma) < 1.2 x 10^{-11} was obtained

Lattice distortions measured in actinide ferromagnets PuP, NpFe2 and NpNi2

Les mesures de rayons X à basses températures indiquent que : (1) la phase cubique de PuP se transforme en une phase tétragonale en dessous de Tc = 125 K qui se manifeste par un élargissement des pics, (2) NpFe2 montre une variation de l'angle du rhomboèdre de 60 à 60,53° en dessous de Tc ~ 500 K, et (3) pour NpNi2 l'angle du rhomboèdre varie de 0,19° ( ±0,02°) en dessous de Tc = 32 K.X-ray low-temperature measurements indicate that : (1) cubic PuP distorts to tetragonal below Tc = 125 K with accompanying line broadening, (2) NpFe2 exhibits a rhombohedral angle distortion from 60 to 60.53° below Tc ~ 500 K, and (3) in NpNi2 the rhombohedral angle changes 0.19° ( ±0.02°) below Tc = 32 K

Investigation of New Routes for the Synthesis of Mn4Si7

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