[en] The spectral flux density n(T) of μ^- emerging from a kapton moderator has been measured at low kinetic energies T using time-of-flight. From n(T) the stopping power S(T) of kapton was determined for 2.5 eV ≤ T ≤ 750 eV by means of the relation n(T)·S(T) = const. The measured n(T) was corrected for multiple scattering and T dependent incident spectrum. n(T)·S(T) behind a mylar wedge, a scintillator and a kapton foil coated with a copper sheet was calculated using the stopping power S^a obtained from proton atomic data starting from a Gaussian μ^- distribution in momentum selected by a magnet spectrometer. At 750 eV S(T) is about ten times larger than the S^a values of the same μ^- velocity, whereas at 2.5 eV S is nearly two orders of magnitude smaller than the corresponding extrapolated S^a

[en] Negative muon lifetimes have been measured in 48 elements including four pairs of separated isotope targets (⁶Li, (⁶Li, ⁷Li, ¹⁰B, ¹¹B, ¹²C, ¹³C, ¹⁶O, ¹⁸O). The experimental set-up and electronics logic were checked against the positive muon lifetime, which was measured to be 2197.0 ± 0.077 ns, in good agreement with the accepted value of 2197.120 ± 0.077 ns. Muons were produced by the backward decay of pions which were provided by the M20 beam channel at TRIUMF. The negative muon lifetimes were measured for all light elements except H and He. An improved accuracy has been achieved in Be, H, O,F, Ha, Cl, and K, and new measurements were peformed for ¹³C, ¹⁸O, Dy and Er. Strong isotope effects were observed in Li, B, and O, but there was no isotope effect in C. Our results in ⁶Li and ⁷Li were in good agreement with the predicted values by Lodder and Jonker. Our measurements confirm that the even-odd effect in heavy nuclei is not strong and the increase of the odd-Z capture rates is smaller than that expected from the quenching of the Cabitbo angle in large magnetic fields. The negative muon beam was also stopped in 23 metallic oxides in order to measure the atomic capture ratios. The number of muons captured by each element was deduced by lifetime analysis. Our result reproduced the periodic dependence and agreed well with earlier x-ray measurements. The results however are of higher accuracy and are liable to very different systematic errors, which gives added confidence to the overall situation

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[en] Electron binding energies in the wake of a swift negative ion such as a muon or an antiproton have been evaluated. The velocity distributions of electrons emerging from the solid at the ionic velocities are also estimated. These calculations could be of guidance to the experimental project of Yamazaki and co-workers directed to elucidate the nature of convoy electrons emerging from solids after the passage of swift ions

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[en] Future selected experiments with muonic atoms require high intensities of low energy muons. A method is described in which the cyclotron trap is used as an efficient device to decelerate muons in thin foils. By applying an electric field to the stop region, some are extracted before stopping. Thus muon beams in the energy range of 5-40 keV with intensities of 10⁵/s will be produced in the near future at PSI

[en] The MEGA experiment at LAMPF is designed to search for the rare decay μ → e+γ with a branching ratio sensitivity of 4x10^-13. The detector consists of an electron spectrometer (a set of low-mass MPWCs and two barrels of scintillators) and a photon arm (three-layer pair spectrometer) in a 1.5-T solenoidal magnetic field. The experimental design maximizes rate capability, retains large solid angle, and suppresses the background to below the experimental sensitivity. In the summer of 1992, the MEGA collaboration successfully finished whole-system tests and got 163.6 million μ→E+γ candidate events by using the electron arm and two of the three photon pair spectrometers. The status of the data analysis will be described

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