Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-11-08
Phys.Lett. B479 (2000) 144-148
Physics
Nuclear Physics
Nuclear Theory
7 pages, LaTeX2e, 2 PS figures, submitted to Phys. Lett. B
Scientific paper
10.1016/S0370-2693(00)00326-9
A simple model, based on two parallel and independent N N -> d pi processes, has recently been proposed for two-pion production in the d d -> alpha X reaction. It reproduces all observed features, including the sharp peak structure in momentum distributions (the ABC effect) and the strong oscillations in the deuteron vector and tensor analyzing powers. This model is now extended to describe also four-pion production with the same basic mechanism, but with two n p -> d pi pi processes as input. The calculations of the high missing mass spectra are within about 30% of the experimental data for beam energies in the range 1.9 < T_d < 2.4 GeV.
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