S. Micheletti

The (n, d) reaction on Cu and Zn isotopes

Abstract Deuteron energy spectra and angular distributions from the (n, d) reaction initiated by 14 MeV neutrons on the isotopes 65 Cu and 66, 68 Zn are given. The angular distributions are fitted with DWBA, and the results are interpreted in terms of the Cu isotope structure as predicted by the unified model.

Study of (p, α) reactions in light nuclei at 38 MeV

Abstract Differential cross sections for (p, α) reactions at E p = 38 MeV have been obtained for 9 Be, 11 B, 12 C, 16 O and 19 F. Some angular distributions show a well-developed diffraction pattern, others do not. The results have been compared with PWBA calculations for four direct mechanisms (pick-up, knock-out, heavy-particle pick-up and heavy-particle knock-out). No single mechanism seems able to reproduce the pattern of any observed distribution for the whole angular range investigated.

A study of proton scattering on A = 92–116 nuclei with extended optical models and the interacting boson approximation

Abstract Differential cross sections for proton elastic and inelastic scattering have been measured at E P = 22.3 MeV for 14 nuclei with 92 ⩽ A ⩽ 116. The energy dependence has been studied, for 104 Pd between 10 and 35 MeV. Nuclear structure effects found in the analysis of elastic scattering are identified with strong couplings between ground and one-phonon states. These couplings are satisfactorily described by traditional collective models, using deformation parameters in agreement with those deduced from electromagnetic data. The transitions to weakly excited states require a more accurate spectroscopic description. Spectroscopic amplitudes taken from the interacting boson model are used. The radial dependence of transition densities is derived from optical model potentials.

Excitation of low-lying states in 144Nd by means of (e,e') scattering

Abstract The low-lying states of 144Nd have been investigated up to an excitation energy of 3.1 MeV by means of high-resolution inelastic electron scattering. Transition charge densities have been extracted for natural-parity states. The experimental data have been compared with the predictions of the quasiparticle-phonon model. The calculations show that both collective and single-particle degrees of freedom are important for describing the low-lying states of 144Nd. A comparison of the present data with data for 142Nd and 142Ce emphasizes the role played by the two valence neutrons outside the N = 82 closed shell.

Compound nucleus and direct effects in the (n, d) reaction on 19F and 23Na at 14 MeV neutron energy

Abstract Differential cross sections for the (n,p) reaction on 19F and the (n,d) reaction of 19F and 23Na have been obtained at En = 14.1 MeV. The analysis of angular distributions requires both direct and compound nucleus contributions, which have been evaluated by DWBA and Hauser-Feshbach theory. The extracted spectroscopic factors have been compared with those predicted on the basis of the shell and collective-rotational models.