Publications by authors named "C Eleon"
Fast neutron interrogation with the associated particle technique can be used to identify explosives in cargo containers (EURITRACK FP6 project) and unexploded ordnance on the seabed (UNCOSS FP7 project), by detecting gamma radiations induced by 14 MeV neutrons produced in the 2H(3H,α)n reaction. The origin of the gamma rays can be determined in 3D by the detection of the alpha particle, which provides the direction of the opposite neutron and its time-of-flight. Gamma spectroscopy provides the relative counts of carbon, nitrogen, and oxygen, which are converted to chemical fractions to differentiate explosives from other organic substances.
View Article and Find Full Text PDFGamma-ray spectra produced in carbon, nitrogen, oxygen, sodium, aluminium, silicon, chlorine, calcium, chromium, iron, nickel, copper, zinc, and lead by 14 MeV tagged neutrons have been collected with NaI(Tl) detectors of the EURITRACK system, which low-energy threshold has been reduced to 0.6 MeV to detect gamma rays of major elements like iron. The spectra have been compared with Monte Carlo simulations to check the tabulated gamma-ray production data.
View Article and Find Full Text PDFThe SPIRAL2 project, currently under construction at GANIL, will include an isotope separator on line based facility for the production and acceleration of radioactive ion beams. A superconducting linear accelerator will accelerate 5 mA deuterons up to 40 MeV and 1 mA heavy ions up to 14.5 MeV/u.
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- A new system for producing multicharged alkali ions has been developed at GANIL/SPIRAL I using a method called "direct 1+/N+," which combines a surface ionization source with an electron-cyclotron-resonance ion source.
- The system was tested with a primary beam of (48)Ca at 60.3 A MeV, and the direct 1+/N+ process showed experimental evidence with a potential difference of 11 V.
- The charge breeding efficiency for (47)K(5+) was 0.04%, significantly lower than the standard 1+/N+ method's efficiency of 6% for stable potassium ions, with possible reasons discussed in the text.
GANIL has been producing many stable and radioactive ion beams for nearly 25 years. Constant progresses have been made in terms of intensity, stability, and reliability. The intensity for some stable metallic beams now exceeds or approaches the p microA level at an energy up to 95 MeV/u, e.
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