Reduced widths for nucleon and deuteron emission from the positive parity (T = 1/2) states in the region of 16 to 20 MeV excitation in the mass-5 system have been calculated using the R-matrix theory. Shell model wave functions were employed to describe the relevant states. Excellent agreement is obtained with various aspects of the experimental results on the well-established 3/2+ resonance at 16.6 MeV. Values for the proton and deuteron partial widths and the γd2/γp2 ratio for the 1/2+ resonance at 18 MeV and 5/2+ resonance at 20 MeV are presented. The calculated proton partial width for the 5/2+ resonance is in the range of values estimated from recent analysis of the p–4He phase-shift data.
Resonance properties including asymptotic normalization coefficients deduced from phase-shift data without the effective-range function