Measurements of the Muon-Capture Rate in He3 and He4

Details Measurements of the Muon-Capture Rate in He3 and He4 Measurements of the Muon-Capture Rate in He3 and He4

Apr 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965phrv..138..127a&link_type=abstract

Physical Review, vol. 138, Issue 1B, pp. 127-144

Physics

32

Scientific paper

In order to test the universality of the V-A Fermi interaction and the presence of the induced pseudoscalar term in the Hamiltonian, we have measured the rate of the reaction μ-+He3-->H3+νμ. This reaction is closely analogous to the fundamental muon-capture interaction μ-+p-->n+νμ. We also have measured the total muon-capture rates in He3 and He4; that is, the rates for the reactions μ-+He3-->all final states and μ-+He4-->all final states. Negative muons were brought to rest in a high-pressure helium-gas target. The capture processes all yield a charged particle, whose energy was measured by observation of scintillation in the helium gas. Captures into the H3 channel were recognized by the unique energy (1.9 MeV) of the triton recoil. The total capture rates obtained were: Λ(He3)=2170-430+170 sec-1, and Λ(He4)=375-300+30 sec-1. The partial capture rate to the triton ground state was measured as Λ(He3-->H3)=1505+/-46 sec-1. These results are in good agreement with theoretical predictions based on a universal Fermi interaction, and on a conserved vector current. They also indicate that the induced-pseudoscalar-coupling coefficient is positive. Interpretation of these results in terms of the fundamental muon-capture process is somewhat ambiguous because of the uncertainty in the structure of the helium nucleus.

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