Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-04-27
Phys.Scripta 64:427-438,2001
Physics
Nuclear Physics
Nuclear Theory
35 pages in LaTeX with 8 postscript figures
Scientific paper
10.1238/Physica.Regular.064a0042
Data on the total cross sections for the pp -> pp eta, pn -> pn eta, and pn -> d eta reactions and the pp -> pp eta differential cross section near threshold are analysed in a one-meson-exchange model. After including initial and final-state nucleon-nucleon distortion, the magnitude and most of the energy dependence are well reproduced. It is found that the contribution of rho-exchange is larger than that of pi-exchange. With destructive rho/pi interference in the pp case, the model explains quantitatively the pp -> pp eta/pn -> pn eta cross section ratio and the slope of the pp -> pp eta differential cross section. Such an agreement would be destroyed by any significant eta-exchange term. The residual energy dependence may be associated with eta-nucleon rescattering that has not been taken into account. The pn -> pn eta/pn -> d eta ratio depends weakly upon the nature of the particle exchanges, being determined primarily by the nucleon-nucleon final state interactions. The proton analysing power is predicted to remain small in the low energy region.
Faeldt Goeran
Wilkin Colin
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