SPECTRUM AND ASYMMETRY OF DIRECT NEUTRONS FROM MUON CAPTURE IN CALCIUM

The energy spectrum and asymmetry of neutrons emitted directly on the capture of polarized muons by Ca40 have been calculated in a simple nuclear shell model, taking account of terms proportional to the nucleon momentum. The energy spectrum is within the error brackets of recent experiments with the nucleon-momentum terms making a small contribution. The asymmetry coefficient is strongly affected by the inclusion of the momentum-dependent terms and is found to change sign and increase in magnitude with increasing energy, in qualitative agreement with recent experiments. © 1969 The American Physical Society.