Projectile structure effects in multi-nucleon and cluster transfers in 16,18 O+ 164 Dy, 208 Pb reactions D C Biswas, Pratap Roy, Y K Gupta et al.
-Comparison of models of neutron and residue production in targets heavy elements irradiated by relativistic proton and deuteron beams P Zhivkov, A Polanski, Ch Stoyanov et al. Abstract. In an experiment performed at ITEP TWA heavy ion accelerator, the yields of hydrogen (p,d,t) and helium (from 3 He to 8 He) isotopes at 3.5 o from fragmentation of 12 C at T0 = 0.2 -3.2 GeV/nucleon on a Be target have been measured. Momentum spectra of the fragments in the projectile rest frame have been obtained in larger momentum intervals than in the previous experiments with heavy ion beams. The main attention was given to the region of high momentum where fragment velocity exceeds the velocity of the projectile nucleus. The obtained data cover about 6 orders of the differential cross section magnitude. It made possible the observation of a transition from the Gaussian shape of the longitudinal momentum spectra in projectile rest frame, expected for the evaporation mechanism, to the exponential shape, typical for the cumulative (pre-equilibrium) processes. The Feynman x distributions for protons are analyzed in the framework of quark-gluon string model. The probabilities of existence of sixand nine-quark clusters are estimated and compared with the results on two-(three-) nucleon short range correlations in nuclei measured at Jefferson Laboratory.