A model for the dd-->??? reaction, based on two parallel NN-->d? reactions, is extended to incorporate a complete set of input amplitudes. While low-energy cross sections are underestimated, the rich structure observed in the ?-particle momentum distributions for 0.8Abashian-Booth-Crowe effect) is extraordinarily well ...

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn?d?^{0}?^{0} over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ??-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ?? process, were performed with the ...

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn?d?0?0 over the full energy region of the ABC effect, a pronounced low-mass enhancement in the ??-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ?? process, were performed with the ...