Decay of negative muons bound in ${}^{27}$Al

Abstract

We present the first measurement of the energy spectrum up to 70 MeV of electrons from the decay of negative muons after they become bound in ${}^{27}$Al atoms. The data were taken with the TWIST apparatus at TRIUMF. We find a muon lifetime of (864.6 $\pm$ 1.2) ns, in agreement with earlier measurements. The asymmetry of the decay spectrum is consistent with zero, indicating that the atomic capture has completely depolarised the muons. The measured momentum spectrum is in reasonable agreement with theoretical predictions at the higher energies, but differences around the peak of the spectrum indicate the need for \oalpha radiative corrections to the calculations. The present measurement is the most precise measurement of the decay spectrum of muons bound to any nucleus.

References in corpus (9)

• Mass effects in muon and semileptonic b -> c decays
• Measurement of the Rate of Muon Capture in Hydrogen Gas and Determination of the Proton's Pseudoscalar Coupling $g_P$
• Measurement of the Michel Parameter $\rho$ in Muon Decay
• Resonant Formation of $d\mu t$ Molecules in Deuterium: An Atomic Beam Measurement of Muon Catalyzed dt Fusion
• Muonium Decay
• Expansion of bound-state energies in powers of m/M
• A Precision Measurement of the Muon Decay Parameters $\rho$ and $\delta$
• Measurement of P_{mu}xi in Polarized Muon Decay
• Precision planar drift chambers and cradle for the TWIST muon decay spectrometer

Cited by in corpus (10)

• Global Constraints on a Heavy Neutrino
• Muon decay in orbit: spectrum of high-energy electrons
• High-energy electrons from the muon decay in orbit: radiative corrections
• Precise measurement of parity violation in polarized muon decay
• Michel decay spectrum for a muon bound to a nucleus
• Bound muon decay spectrum in the leading logarithmic accuracy
• Bounds on majoron emission from muon to electron conversion experiments
• GermanIum Array for Non-destructive Testing (GIANT) setup for Muon Induced X-ray Emission (MIXE) at the Paul Scherrer Institute
• Charged particle spectra from ${\mu }^{-}$ capture on Al
• Shape function in QED and bound muon decays