Structure in two_pion production in the d d -> alpha X reaction
  A model for the d d -> alpha pi pi reaction, based on two parallel N N -> d pi reactions, is extended to incorporate a complete set of input amplitudes. While low-energy cross sections are underestimated, the rich structure observed in the alpha-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. 
Anders Gardestig (1), Goran Faldt (1) and Colin Wilkin (2) ((1)   Uppsala University, Sweden, (2) University College London, UK)