Multiple-source analysis of inclusive proton spectra from58Ni +60Ni Collisions at 876.5 MeV

Experimental inclusive proton spectra of⁵⁸Ni+⁶⁰Ni at 15.1 MeV/u have been decomposed using three moving sources associated with, respectively, equilibrium, deep-inelastic, and preequilibrium processes. For the last, a new expression, taking into account the anisotropy of preequilibrium particles in the source system, has been applied. The high-energy part of the obtained angle-integrated proton spectrum has been compared with predictions of the diabatic dissipation model.     

Nuclear structure study of states in 72Ge and 74Ge with (p,t) reactions

^{74, 76}Ge(p, t) measurements at E_p = 35.4 MeV are reported. It is found that, except for a depression of the ⁷²Ge ground-state energy accompanying the occurrence of a low-lying 0⁺ excited state, the energy level structure of ⁷²Ge is nearly identical to that of ⁷⁴Ge. Dependence of angular distribution shapes at low angles on the transferred neutron configuration is observed, both experimentally and in the DWBA calculations.     

Elastic and inelastic scattering of 79.5 MeV 11B and 87.5 MeV 10B ions

The elastic scattering of 79.5 MeV ¹¹B ions has been studied for seven targets ranging in mass from ²⁴Mg to ¹⁹⁷Au and of 87.5 MeV ¹⁰B ions for three of these targets (^{24, 25}Mg, ⁶⁰Ni). Angular distributions were measured from ~10° c.m. in steps of 0.5°, to angles beyond 40° c.m. where the elastic cross sections are ? 10^?3 of the Rutherford values (except for ¹⁹⁷Au). Inelastic data for exciting the lowest 2⁺ states of ^24,26Mg and ⁶⁰Ni were also obtained. Important odd-A-even-A differences are observed in the ¹¹B elastic angular distributions for the Mg and Al targets; for ¹⁰B scattering these are obscured by projectile quadrupole moment effects on the elastic scattering. The elastic data were analyzed using the optical model with potentials of both Woods-Saxon and double-folding form. The data for both ¹⁰B and ¹¹B are consistent with the potential obtained in the folding model with the M3Y interaction without renormalization. The inelastic data were analyzed by the distorted-waves method.     

T=1, spin-dipole strength in40Ca

Spin-dipole strength in⁴⁰Ca has been studied by inelastic scattering of 500-MeV protons and the dipole response in⁴⁰Ca is compared with the spin-dipole data from the⁴⁰Ca(p, n) reaction and nonspin-dipole data from photonuclear studies.     

Transfer reactions at high energy and ambiguities in heavy-ion potentials

The smaller impact parameters that contribute to transfer reactions between heavy ions at high energies make them more sensitive to different types of optical potentials than is the case at lower energies. This may allow one to distinguish between potentials that otherwise generate similar elastic scattering cross sections within the limited angular region over which typical elastic data are available. We cite as evidence results for nucleon transfers induced by¹⁸O +²⁸Si at 352 MeV which rule out surface transparent potentials.