[en] The working conditions of a new on-line electrostatic collection system are presented. The main characteristics are high efficiency (reaching 20%) and short delay time (down to the millisecond). A systematic study of this method, comparing experiment and theory, is done. The device has been successfully used on the one hand for the exotic isotopes research (discovery of ¹⁸⁴Pb) and on the other hand for the study of reactions induced by a ¹²C beam at 86 MeV/nucleon

[en] CANDU heavy water reactors produce tritium in the moderator and coolant circuits through neutron absorption by the deuterium atoms in heavy water. The concentration of tritium, in the form of DTO molecules builds up slowly with time of reactor operation. A typical yearly production rate of tritium is 2400 curie for each megawatt of electricity produced and as a consequence, a 600 megawatt Candu reactor produces 1.4 million curie of tritium per year. Tritium decays to ₃He, a non radioactive species, and has a half life of approximately 12 years. Both Ontario Hydro and AECL are constructing plants to remove tritium from heavy water to maintain the tritium concentration below the equilibrium value. This will result in lower radiation doses to operating personnel and reduce the level of radiation in any releases of heavy water to the environment

[en] The working conditions of a new on-line electrostatic collection system are presented. The main charactersitics are high efficiency (reaching 20%) and short delay time (down to the millisecond). The salient features of specific devices for measurements of absolute cross sections, recoil range distributions and angular distributions are given

[en] This group is engaged in a wide variety of experiments using beams accelerated by the Bevalac. In recent years, interests have ranged from nuclear structure physics to reaction mechanism studies at very high energies. They authors are currently involved in two major development projects. The first is their segmented Cerenkov detector which they have built to measure the interaction mean free paths of secondary fragments produced in relativistic heavy ion collisions. The development of this device was spurred by the observation first in the cosmic rays and later in experiments at the Bevalac that a fraction of projectile fragments produced in relativistic heavy ion collisons have interaction mean free paths that are very much shorter than normal. Anomalons, the particles responsible for this effect, are the subject of great current interest. The second major project is the development of a Cerenkov detector to be used at the HISS facility. This is a novel device, the design of which has been very much influenced by the experience with Cerenkov detectors that the authors have gained during their anomalon experiment. The detector will be a hodoscope of total internal reflection counters capable of measuring both the charge and the velocity of projectile fragments at least up to mass 100

[en] We present cross sections, mean projected recoil ranges and angular distributions of radioactive alpha emitters produced in ¹²C-induced reactions at 1 GeV on targets ranging from Gd to Pb. We use a new technique of on-line electrostatic collection. The wide spectrum of produced isotopes corresponds to nuclei close to the target up to nuclei with as much as 60 nucleons less than the target. The intranuclear cascade calculations can reproduce the main features of nuclei having lost up

[en] Radioactive studies of light neutron rich exotic nuclei have been performed on the LISE line at GANIL. These isotopes were produced via projectile nuclear fragmentation of 60 MeV/nucleon ⁴⁰Ar on Be. Physical separation of the nucleides was achieved through the Projectile Fragment Isotopic Separation (PFIS) method (magnetic analysis and differential stopping power effects). At least 8 nuclei were observed for the first time through β-γ coincidence measurements (⁴⁰S, ³⁸P, ³⁷P, ³⁶Si, ³⁵Si, ²⁴F, ²²O) as well as already known half-lives to provide a check of the procedure (³⁶P, ³⁰Mg, ³²Al)

[en] Published in summary form only

[en] The availability at GANIL of high intensity, high resolution heavy ion beams in the intermediate energy range called for the development of new experimental facilities well adapted to the associated reaction mechanisms. At such energies the stripping is a dominant phenomenon, in atomic physics one may produce hydrogen or helium like ions through the electronic stripping process, in nuclear physics the projectile fragmentation follows from a similar nucleonic stripping. In both cases the secondary fragments have a velocity very close in value and direction to that of the beam. The LISE facility (Ligne d'Ions Super-Epluches: super-stripped ions beam line) has thus been built to cover the needs for both atomic and nuclear physics experiments. (orig./HSI)

[en] This paper reports on nuclei at the limit of nuclear binding which exhibit new properties such as beta-delayed three-proton emission, large total reaction cross-section. The search for two-proton radioactivity of ³⁹Ti was unsuccessful, giving some indication of possible symmetry breaking

[en] The possibility of using secondary reactions as a tool to produce new isotopes is considered. This question is renewed with the emergence of intense beams of energetic heavy ions in the range of 20 to 100 MeV/nucleon. Three different methods are considered. They involve either the in situ production of a secondary radioactive target, which interacts with the primary beam, or the production of a radioactive secondary beam by an inverse fusion or a fragmentation process. Very heavy or very neutron deficient isotopes can be produced by these methods