PRODUCTION OF DELTA-RESONANCES AND N-ASTERISK-RESONANCES IN THE ONE-BOSON EXCHANGE MODEL

Motivated by the renewed interest on the creation of nuclear resonances in the studies of relativistic heavy-ion collisions we calculate the total and differential cross sections of the reactions N + N --> DELTA + N, N + N --> DELTA + DELTA and N + N --> N* + N and the subsequent decay of the resonances into pions and nucleons employing the one-boson exchange model. The parameters of the model are adjusted to the elastic nucleon-nucleon scattering. As far as data are available, the calculations agree well with experiment and hence the direct pion production seems to play an essential role very close to the threshold only. Finally, we present a simple parametrization of the theoretical results of the total as well as of the differential cross section.