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B Perot, W El Kanawati, C Carasco, C Eleon, V Valkovic, D Sudac, J Obhodas, G Sannie
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...
July 2012: Applied Radiation and Isotopes
W El Kanawati, B Perot, C Carasco, C Eleon, V Valkovic, D Sudac, J Obhodas, G Sannie
Gamma-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. A quantitative approach to subtract the scattered neutron background is also reported...
May 2011: Applied Radiation and Isotopes
N Lecesne, C Eleon, C Feierstein, G Gaubert, Y Huguet, P Jardin, F Lemagnen, R Leroy, J Y Pacquet, F Pellemoine, A Pichard, O Bajeat, S Essabaa, C Lau, F Launay, L Serani, C-E Demonchy
The 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. These primary beams will be used to bombard both thick and thin targets. We are investigating three different techniques to produce the radioactive ion beams: (1) the neutron induced fission of uranium carbide, (2) the direct interaction of deuterons in a uranium carbide target, and (3) the interaction of a heavy ion beam with a target...
February 2008: Review of Scientific Instruments
C Eléon, G Gaubert, P Jardin, M-G Saint-Laurent, J Alcantara, R Alvès Condé, C Barué, D Boilley, J C Cornell, P Delahaye, M Dubois, B Jacquot, P Leherissier, R Leroy, G Lhersonneau, M Marie-Jeanne, L Maunoury, J-Y Pacquet, F Pellemoine, C Pierret, J C Thomas, A C C Villari
In the framework of the production of radioactive ion beams by the isotope separator online method, a new system has been developed at GANIL/SPIRAL I to produce multicharged alkali ions. The principle, referred to as the "direct 1+/N+ method," consists of a surface ionization source associated with a multicharged electron-cyclotron-resonance ion source without an intermediate mass separator. This new system has been tested online using a (48)Ca primary beam at 60.3 A MeV. The experimental evidence of the direct 1+/N+ process has been obtained for a potential difference between the two sources of 11 V and with a 1+/N+ charge breeding efficiency of 0...
February 2008: Review of Scientific Instruments
G Gaubert, C Barué, C Canet, J C Cornell, M Dubois, M Dupuis, C Eleon, J L Flambard, R Frigot, P Jardin, C Leboucher, N Lecesne, P Leherissier, F Lemagnen, R Leroy, J Y Pacquet
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.g., 1.14 p microA for (36)S (65% enriched) at 77 MeV/u, 0.35 p microA for (58)Ni (63% enriched) at 74 MeV/u. Some recent results with Magnesocene using the metallic ions from volatile compounds method should also make possible the production of metallic beams with an intensity greater than 1 p microA...
February 2008: Review of Scientific Instruments
P Mueller, I A Sulai, A C C Villari, J A Alcántara-Núñez, R Alves-Condé, K Bailey, G W F Drake, M Dubois, C Eléon, G Gaubert, R J Holt, R V F Janssens, N Lecesne, Z-T Lu, T P O'Connor, M-G Saint-Laurent, J-C Thomas, L-B Wang
The root-mean-square (rms) nuclear charge radius of 8He, the most neutron-rich of all particle-stable nuclei, has been determined for the first time to be 1.93(3) fm. In addition, the rms charge radius of 6He was measured to be 2.068(11) fm, in excellent agreement with a previous result. The significant reduction in charge radius from 6He to 8He is an indication of the change in the correlations of the excess neutrons and is consistent with the 8He neutron halo structure. The experiment was based on laser spectroscopy of individual helium atoms cooled and confined in a magneto-optical trap...
December 21, 2007: Physical Review Letters
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