[en] In an experiment at the SISSI/LISE facility of GANIL, the projectile fragmentation of a ⁷⁸Kr primary beam has been used at 73 MeV/nucleon to produce new isotopes and to study either their β-delayed decay or their isomer γ decay. The results obtained in the search for new isotopes are described where five new isotopes (⁶⁰Ga, ⁶⁴As, ^69,70Kr and ⁷⁴Sr) have been found. However, in contrast to a recent experimental result, no count for ⁶⁹Br was found, whereas other T_z=-1/2 nuclei have been observed with more than 1000 counts. ⁶⁹Br is thus deduced to a proton-unbound nucleus with a half-life shorter than about 100 ns. The influence of these results on our understanding of the astrophysical rp process is discussed. (author) 15 refs.; 5 figs

[en] In an experiment performed at the SISSI/LISE facility, new proton-rich isotopes have been found by means of projectile fragmentation of a primary ⁷⁸Kr beam at 73 MeV/nucleon and measured for the first time β-delayed protons from ⁶⁷Se, ⁷¹Kr, and ⁷⁵Sr. (K.A.)

[en] We have converted the THEMIS solar array (French Pyrenees) into an atmospheric Cherenkov telescope, called CELESTE, sensitive to astrophysical gamma rays above 30 GeV (7x10²⁴ Hz). In early 1998 the Crab nebula was detected at 80 GeV with a preliminary 18 heliostat setup. The full 40 heliostat array has since been commissioned. The STACEE experiment using the same technique in New Mexico is also analysing their first data. Thus, the window between the EGRET instrument and the Cherenkov imagers has been opened. We describe the CELESTE detector and the data analysis, and discuss the prospects for studying AGN (specifically, blazars) and galactic sources in this energy range

[en] The most neutron-deficient isotopes in the N = Z region are an important source of information on the neutron-proton interaction far off stability. The isotopes in this region are characterized by an extreme sensitivity of the deformation to the isospin variations. Here the structure of deformed shells are favoring the high spin states the lifetime of which being sufficient long to be observed after flight time of the order of the microsecond. The study of the decay of this isomeric states permits to approach the structure of the first excited levels of this isotopes. Recent experiments at GANIL with the SISSI - LISE 3 spectrometer were performed to study the neutron deficient nucleus ⁶⁶As. This nucleus was produced in the fragmentation of 70 MeV/u ⁷⁸Kr primary beam in a nickel target. Two new isomeric states have been observed. From the observed γ transitions a decay scheme is proposed

[en] In an experiment at the SISSI/LISE facility of GANIL, we used the projectile fragmentation of a ⁷⁸Kr primary beam at 73 MeV/nucleon to produce new isotopes of astrophysical interest. We obtained clear evidence for the existence of the five new isotopes ⁶⁰Ga, ⁶⁴As, ^69,70Kr, and ⁷⁴Sr. However, we did not find any evidence for ⁶⁹Br, whereas comparable nuclei were observed with more than 1000 counts. The isotope ⁶⁹Br is thus deduced to be a proton-unbound nucleus with a half-life shorter than about 100 ns. The influence of these results on our understanding of the astrophysical RP process is discussed

[en] CELESTE is an atmospheric Cherenkov telescope based on the sampling method which makes use of the de-commissioned THEMIS solar electrical plant in the French Pyrenees. A large (2000 m²) mirror surface area from 40 independent heliostats followed by a secondary optic, a trigger system using analog summing techniques and signal digitization with 1 GHz flash ADCs make possible the detection of cosmic γ-rays down to 30 GeV. This paper provides a detailed technical description of the CELESTE installation