We have measured the differential cross section dσ/dΩ and the analyzing power $A_y$ in the elastic p${\mathrm{-}}^4$He scattering at 71.9 MeV. These data, together with all other existing data between 30 and 65 MeV, were subjected to a phase-shift analysis. New fixed energy solutions were found, which typically exhibit lower ${\chi }^2$ values than existing solutions and are consistent with a continuous energy dependence. An energy-dependent analysis with a quadratic energy dependence reproduced the trend of the single-energy solutions, but yielded large ${\chi }^2$ values.

• Received 9 May 1988

DOI:https://doi.org/10.1103/PhysRevC.39.56