The role of the Roper resonance in np -> d(pi pi)(0)

In this work, a model for the np --> d(pi pi)(0) reaction is developed. It is shown that the structure of the deuteron momentum spectra for a neutron beam momentum of 1.46 GeV/c can be explained as a consequence of the interp lay of two mechanisms involving the excitation of the N*(1440) resonance an d its subsequent decay into N(pi pi)(S-wave)(T=0) and Delta pi respectively . The relevance of the present analysis for the study of the Roper excitati on and decay properties is discussed. (C) 1999 Published by Elsevier Scienc e B.V. AU rights reserved.