Multi-pion production in the dd→αX reaction

Abstract

A model for the dd → αππ reaction, based on two parallel NN → dπ reactions, is extended to incorporate a complete set of input amplitudes. While low-energy cross sections are underestimated, the rich structure observed in the α-particle momentum distributions for 0.8 < T d < 1.9 GeV (the ABC effect) is extraordinarily well reproduced. In addition, a recent measurement of deuteron analyzing powers agrees quite well with our predictions, both in frequency and magnitude of the oscillations. 1