No abstract available

[en] For the previously reported Gamow-Teller transition centered in ⁹⁰Nb at 8.4 MeV, two components are observed in the ⁹⁰Zr (³He,t) ⁹⁰Nb reaction at 80 MeV. The first one of M1 type is centered at 7.2 MeV, the other one of unknown multipolarity at 9.7 MeV

[en] Differential cross sections, excitation functions, and reflection coefficients are presented for the reaction ⁴⁰Ca + ⁴⁰Ca at 55 to 120 MeV (c.m.). The reaction mechanisms and structure in the studied parameters are considered

[en] The isoscalar giant resonance region has been investigated in /sup 58/Ni, /sup 92/Mo, and /sup 120/Sn nuclei by inelastic scattering of /sup 4/He particles at small angles where the quadrupole and monopole states can be distinguished through their angular distributions. A monopole resonance is observed in the three nuclei, exhausting, respectively, 23%, 85%, and 110% of the E0 energy weighted sum rule

[en] The giant quadrupole resonance and the low-lying quadrupole transition have been investigated in /sup 58/Ni, /sup 92/Mo, /sup 120,124/Sn, /sup 140/Ce, and /sup 208/Pb by inelastic scattering of 108.5 MeV ³He particles at very small angles. Anomalous rise of the giant quadrupole resonance cross section is observed to 0⁰. Distorted-wave Born approximation calculations are reported. Possible interpretations of the anomalous effect are discussed

[en] Inelastic ¹²C and ¹⁴N scattering experiments have been performed on ⁹⁰Zr and ²⁰⁸Pb at E12C = 120 MeV, and on ⁴⁰Ca, ⁹⁰Zr, ¹⁹⁷Au, ²⁰⁸Pb, and ²⁰⁹Bi at E14N = 161 MeV. Giant resonances are observed in all spectra. An angular distribution has been measured on a ²⁰⁸Pb target, for which distorted-wave Born-approximation analysis is presented

[en] Inelastic scattering of 110 MeV ³He particles is used to probe the quadrupole strength in the even Mo isotopes. The peak position of the giant quadrupole resonance is found to decrease more rapidly than predicted by the A/sup -1/3/ law, a behavior very similar to that exhibited by the photonuclear giant dipole resonance. The width and strength of the giant quadrupole resonance are practically constant in ⁹²Mo through ¹⁰⁰Mo

[en] The giant monopole resonance in the region of deformed nuclei has been investigated by inelastic scattering of 108.5 MeV ³He at very small scattering angles. Evidence is reported for coupling between the giant monopole and giant quadrupole vibrations, based both on energy shift and transition strength

[en] The study of pion production in heavy ion collisions was mainly motived by the observation of an enhancement of yield from a source of hot or/and dense nuclear matter. At subthreshold incident energies the background of incoherent nucleon-nucleon processes is expected to be strongly reduced, then any collective signal should be better seen. In the data no significant deviation of the cross-sections was observed, excepted may be for the lowest incident energies. An overview of this subject was already presented at the last RIKEN-IN2P3 symposium and in this paper, the author focuses on a particular aspect of charged pions spectra from which one can expect to draw some information about the collision dynamics in the region below 100 MeV per nucleon. It was in one of the first experiment of π production in Ne+NaF collisions at BEVALAC, that a large difference between π and π+ was observed at an angle of zero degrees. The ratio π^-/π⁺ showed a narrow maximum as function of momentum for those pions having a velocity close to the beam. This peak was clearly visible for incident energy above 200 MeV per nucleon, where the projectile velocity better matched the experimental pion acceptance. This effect was easily interpreted in term of the Coulomb interaction between the pions and the fragments of the projectile travelling along the beam axis. A complete theory was developed, which was used to determine the projectile charge after the collision; this was confirmed experimentally in coincidence experiments. Nearly at the same time (more than ten years ago) it was suggested by the authors of reference, working on pion production in heavy ion collisions at higher incident energies, that it might be possible to get some geometrical picture of the collision via the same coulomb process

[en] A fast neutron irradiation facility has been set up at the SARA cyclotron located in Grenoble. This facility provides the possibility to carry out fast neutron irradiation tests at both cryogenic and ambient temperatures. Neutrons are produced by stopping a 20.2 MeV deuteron beam in a 3 mm thick beryllium target. The angular distribution of the neutron flux and the energy spectra from 0 to 40 with respect to the deuteron beam axis were measured. A neutron fluence in the range of 10¹⁴ cm^-2 is available per day, with a small gamma contamination and a small thermal neutron flux. (orig.)