M. Cavallaro

The MAGNEX large acceptance spectrometer

The main features of the MAGNEX large acceptance magnetic spectrometer are described. It has a quadrupole + dipole layout and a hybrid detector located at the focal plane. The aberrations due to the large angular (50 msr) and momentum (± 13%) acceptance are reduced by an accurate hardware design and then compensated by an innovative software ray‐reconstruction technique. The obtained resolution in energy, angle and mass are presented in the paper. MAGNEX has been used up to now for different experiments in nuclear physics and astrophysics confirming to be a multipurpose device.

Study of the [sup 19]O states via the ([sup 7]Li,[sup 7]Be) reaction at 52 MeV

The 19F(7Li,7Be)19O reaction at 52 MeV incident energy has been performed at INFN‐LNS in Catania using the MAGNEX large acceptance spectrometer. The use of an algebraic ray‐reconstruction technique has allowed to extract the 19O excitation energy spectrum and the experimental angular distributions. A theoretical analysis based on the Quasi‐particle Random Phase Approximation has described the transitions to the 1p‐1h states of the 19O, in close agreement with the experimental cross sections without using any scaling factor.

First Results from The MAGNEX Large Acceptance Spectrometer

The MAGNEX large‐acceptance spectrometer was commissioned with beams from the LNS Tandem. First results of physical interest are presented. The obtained 10−3 energy resolution confirms the ambitious characteristic of the calculations and allows considering the instrument as an ideal tool for future studies in the field of nuclear spectroscopy and reaction mechanisms at incident energies not far form the Coulomb barrier.

Exploring Light Neutron Rich Nuclei via the (7Li,7Be) Reaction

A systematic study of the nuclei that can be described as an integer number of α particles plus three neutrons via the (7Li,7Be) reaction at about 8 MeV/u has shown the presence of Bound States Embedded in the Continuum in the energy spectra. These are experimental signatures of the dynamical correlations of an easily polarizable core with a single‐particle state of the valence neutron.

First results and planned experiments with the INFN‐LNS ray‐tracing magnetic spectrometer MAGNEX

The MAGNEX large‐acceptance ray‐tracing magnetic spectrometer has recently been used with beams from the INFN‐LNS Tandem accelerator. After an accurate commissioning, the instrument has started an ambitious experimental program. In the first experiment the 19F(7Li,7Be)19O charge‐exchange reaction was studied at 52 MeV incident energy. The 19O excitation energy spectrum was reconstructed and the angular distributions measured. The second experiment was aimed at the study of the 15C via the 13C(18O,16O)15C reaction at 84 MeV incident energy. The ejectiles where detected at forward angles and mass identified by means of an innovative technique. The 15C excitation energy spectra up to about 20 MeV were obtained with a 250 keV FWHM energy resolution. In addition to several known states, the spectra show two unknown resonant‐like structures at 11.4 and 14.0 MeV. The strong population of these structures, together with the measured widths, could indicate the collective nature of these states associated to a corr...