Short-range NN properties in the processes and
Kazakh National University, 480078, Almaty, Kazakhstan
2 Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980, Dubna, Russia
3 Institut für Kernphysik, Forschungszentrum Jülich, 52425, Jülich, Germany
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The data from the first measurement, performed at ANKE/COSY, of the unpolarized cross-section of the reaction in the kinematics of backward elastic scattering at proton beam energies between 0.6 and 1.9 GeV are analyzed in a phenomenological approach. The data and the triplet cross-section of the reaction , calculated from the data on the basis of the Fäldt-Wilkin extrapolation, are used here to derive the ratio of the singlet production matrix element squared to the triplet one. This ratio, defined in our earlier analysis of data in a largely model-independent way, depends on the dynamics of the pd interaction. We find here and show that the smallness of this value may point toward softness of the deuteron at short NN distances.
© Società Italiana di Fisica and Springer-Verlag, 2003