Microscopic study ofp+α bremsstrahlung

Bremsstrahlung double cross sections for p+α collisions are computed by using the wave functions obtained from a single-configuration resonating-group calculation. The photon-emission operator employed is translationally invariant and the center-of-mass motion is strictly eliminated from the transition amplitude. Analytical expressions for the reduced matrix elements are derived without invoking the long-wavelength approximation. With no adjustable parameters, it is found that there is a very good agreement between calculated and experimental values. Effects of the p+α, 3/$2^{\mathrm{-}}$ resonance show up distinctly in the cross-section curve when this resonance occurs in the final channel. On the other hand, the presence of the very broad 1/$2^{\mathrm{-}}$ level becomes detectable from the bremsstrahlung cross-section result only when there is a proper choice of the geometrical arrangement of the particle detectors.