MUON CAPTURE IN (P-MU-D) (+) MOLECULES,
COLUMBIA UNIV IRVINGTON-ON-HUDSON N Y NEVIS LABS
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The p-mu-d molecules and mu-He3 atoms formed in liquid hydrogen were used to detect neutrons from muon capture by deuteron and from muon capture by He3. A purified muon beam was stopped in a target containing ultrapure liquid hydrogen with 0.32 deuterium added. The time distribution of neutrons from rare muon capture processes was measured. Converted to the muon-d atom case, the measured capture rate gives 388 101 1sec for muon capture from the doublet state of muon-d, compared with the theoretical rate of 348 1sec predicted by the current phenomenological muon capture theory and it provides the clearest verification of the Pauli exclusion principle effect in muon capture. The neutron rate from muon capture by He3 was shown to be in good agreement with theory. A theoretical investigation of the muon-d capture and muon-He3 capture into break-up channels was carried out. Neutron energy spectra for muon capture in the separate muon-d hyperfine states were obtained. The muon-He3 capture processes were studied in the plane-wave approximation, with Gaussian-type wave function for the He3 nucleus.