Author
A. Pantaleo
Bio: A. Pantaleo is an academic researcher from Istituto Nazionale di Fisica Nucleare. The author has contributed to research in topics: Nuclear reaction & Inelastic scattering. The author has an hindex of 10, co-authored 28 publications receiving 639 citations.
Papers
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TL;DR: In this article, complex fragments of 3 Z ⪅35 have been detected in reverse-kinematics reactions of 93 Nb plus 9 Be, 12 C and 27 Al at bombarding energies of E / A = 11.4, 14.7 and 18.0 MeV.
405 citations
TL;DR: In this paper, a set of mass dependent optical-model parameters which produce acceptable fits at forward angles was derived and the results of this and of a coupled-channels analysis are discussed.
Abstract: Differential cross sections for proton scattering on 61 nuclei with mass numbers between 9 and 70 were measured at 35.2 MeV incident energy. To extend previous measurements further data were collected at 29.7 MeV on 10 nuclei. From a detailed inspection of the data a definite correlation emerges between the elastic and inelastic cross section values at backward angles and the quadrupole deformation parameters ..beta../sub 2/. Nuclear structure effects are also evident at forward angles at the filling of the 1p shell. A set of mass dependent optical-model parameters which produces acceptable fits at forward angles was derived. The imaginary part was found to contain terms connected with the above structure effects. The results of this and of a coupled-channels analysis are discussed.
73 citations
TL;DR: In this paper, the roles of deep-inelastic, fast-fission, and incomplete fusion processes, and the statistical, compound nucleus emission of complex fragments are discussed, from the measured angular distributions, the cross sections for the isotropic, target-like and projectile-like components were extracted.
36 citations
TL;DR: In this article, a collective model for elastic and inelastic scattering of proton nuclei has been proposed, which is satisfactorily described by traditional collective models, using deformation parameters in agreement with those deduced from electromagnetic data.
Abstract: Differential cross sections for proton elastic and inelastic scattering have been measured at ${E}_{p}=22.3$ MeV for 14 nuclei with $92\ensuremath{\le}A\ensuremath{\le}116$. The energy dependence has been studied between 10 and 35 MeV, considering also reaction cross sections at lower incident energies. The long standing sub-Coulomb optical model anomalies are thereby eliminated. 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.
26 citations
TL;DR: Differential cross sections for proton elastic scattering by spherical nuclei were measured at several proton energies between 14 and 44 MeV in this article, where the partial waves involved are those near grazing.
Abstract: Differential cross sections for proton elastic scattering by /sup 15/N, /sup 18/O, /sup 24/Mg, and /sup 40/Ar were measured at several proton energies between 14 and 44 MeV. Previous data on /sup 12/C, /sup 16/O, /sup 24/Mg, /sup 28/Si, and /sup 40/Ca have also been considered. Evidence has been found for a strong enhancement in proton emission at backward angles for scattering by spherical nuclei at incident energies higher than 26 MeV. A phase-shift analysis of all the differential cross sections showed that the partial waves involved are those near grazing. Optical-model fits of good quality have been obtained for collective nuclei, while for spherical nuclei the cross sections at backward angles are not reproduced. The disagreement is not substantially modified when nonstandard radial dependences are given to the optical potential.
26 citations
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TL;DR: In this article, the authors presented new phenomenological optical model potentials for neutrons and protons with incident energies from 1 keV up to 200 MeV, for (near-)spherical nuclides in the mass range 24⩽ A ⩽209 They are based on a smooth, unique functional form for the energy dependence of the potential depths, and on physically constrained geometry parameters.
1,373 citations
TL;DR: In this paper, the energy levels of A = 11 and 12 nuclei with emphasis on material leading to information about the structure of the A =11 and 12 systems were analyzed.
571 citations
TL;DR: The fragment distributions resulting from Au+Au collisions at an incident energy of {ital E}/{ital A}=600 MeV and the mass and the excitation energy of the decaying prefragments were determined.
Abstract: Fragment distributions resulting from $\mathrm{Au}+\mathrm{Au}$ collisions at an incident energy of $E/A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}600\phantom{\rule{0ex}{0ex}}\mathrm{MeV}$ are studied. From the measured fragment and neutron distributions the mass and the excitation energy of the decaying prefragments were determined. A temperature scale was derived from observed yield ratios of He and Li isotopes. The relation between this isotope temperature and the excitation energy of the system exhibits a behavior which is expected for a phase transition. The nuclear vapor regime takes over at an excitation energy of 10 MeV per nucleon, a temperature of 5 MeV, and may be characterized by a density of 0.15--0.3 normal nuclear density.
464 citations
TL;DR: In this article, the decay of 132La to 132Ba has been studied in several works, including some recent papers, but in the opinion of the evaluators, this decay scheme still suffers from incompleteness, especially from the point of view of separate level schemes from the ground state and the isomeric activities.
176 citations
TL;DR: A review of evidence on the properties of the A=12 nuclei is given in this article, with emphasis on material leading to information about the structure of A = 12 systems.
157 citations