The differential cross section and polarization in p -d elastic scattering have been measured at an incident laboratory momentum of 0.99 GeV/c (kinetic energy 425 MeV) over most of the angular range. Elastic p-d scattering events from a CD2 target were selected by angular correlation, coplanarity, and time of flight. A significant feature of the results is the large positive polarization at backward scattering angles.

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 iT-\-He 3 -» H 3 +*> M . This reaction is closely analogous to the fundamental muon-capture interaction n~-\-p -» n-j-v^. We also have measured the total muon-capture rates in He 3 and He 4 ; that is, the rates for the reactions i u""+He 3 -> all final states and /z~+He 4 -> 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 H 3 channel were recognized by the unique energy (1.9 MeV) of the triton recoil. The total capture rates obtained were: A (He 3 ) = 2170_ 4 30 +17° sec -1 , and A (He 4 ) = 375_ 3 oo +3° sec -1 . The partial capture rate to the triton ground state was measured as A (He 3 -> H 3 ) = 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.where the total muon-disappearance rate is AT-AB 4 A. F. Yano, Phys. Rev. Letters 12, 110 (1964). B127 B 128 AUERBACH, ESTERLING, HILL, JENKINS, LACH, AND LIP MAN 42 A. M. L. Messiah, Phys. Rev. 87, 639 (1952). 43 A. F. Yano (private communication).

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