J Van Gils
Ghent University
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Featured researches published by J Van Gils.
Nuclear Science and Engineering | 2007
J. Heyse; Cyrillus Wagemans; L. De Smet; O Serot; Jan Wagemans; J Van Gils
Abstract The 234U(n,f) cross section has been measured in the energy range from 0.5 eV to 100 keV at the GELINA neutron time-of-flight facility of the Institute for Reference Materials and Measurements in Geel using highly enriched 234U samples. Two independent measurements were performed: one in a low detection geometry (15% of 2π) and another in a 2π detection geometry. A 235U(n,f) cross-section measurement was performed under the same experimental conditions, allowing a reliable correction for the 235U(n,f) contribution to the yield. Special attention has been given to the strongest resonance at 5.16 eV and to the fission resonance integral If, for which large discrepancies are reported in the literature.
Nuclear Science and Engineering | 2008
C. Wagemans; L. De Smet; S. Vermote; J. Heyse; J Van Gils; O Serot
Abstract The 236U(n,f) cross section has been measured in the energy range from 0.5 eV to 25 keV at the Geel Electron Linear Accelerator neutron time-of-flight facility of the Institute for Reference Materials and Measurements in Geel, Belgium. A highly enriched 236U sample was mounted back-to-back with a 10B sample in the center of a Frisch-gridded ionization chamber, hence realizing a 2π detection geometry. A 235U(n,f) cross-section control measurement was performed in the same experimental conditions. Special attention has been given to the fission resonance integral If and to the strongest resonance at 5.45 eV, for which a resonance analysis has been performed yielding Γf = 1.7 μeV. Both values are highly overestimated in the literature.
Seminar on fission | 2010
Olivier Serot; Cyrillus Wagemans; S. Vermote; J Van Gils
A new cross section measurement for the ^245Cm(n,f) reaction in the thermal energy region has been performed at the GELINA neutron facility of the Institute for Reference Materials and Measurements (IRMM) in Geel, Belgium. The energy of the neutrons is determined applying the time of flight method using a flight path length of about 9 m. In the present work, the incident neutron energy covers 10 meV up to a few eV. A 98.48% enriched ^245Cm sample was mounted back-to-back with a ^10B sample in the centre of a vacuum chamber together with two surface barrier detectors positioned outside the neutron beam. One detector measured the ^10B(n,a)^7Li reaction products for the neutron flux determination, while the second one registered the ^245Cm(n,f) fragments. In this way, the neutron flux can be determined simultaneously with the fission fragments. A control measurement has been performed replacing the ^245Cm sample with a ^235U sample in order to check that the well-known ^235U(n,f) cross section can be reproduced. Our measurement yielded a ^245Cm(nth,f) cross section of 2131±43±173 b and a Westcott factor gf=0.939±0.019.
Proceedings of International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX — PoS(NIC-IX) | 2010
Liesbeth De Smet; C. Wagemans; J. Heyse; S. Vermote; J Van Gils
The 41Ca(n,α)38Ar reaction cross section has been studied with resonance neutrons at the linear accelerator GELINA of the IRMM in Geel (Belgium) and has been determined up to 45 keV using the time-of-flight technique. A dozen resonances have been identified and for most of them the area, the total width, and a value for Γn/Γp could be determined. From the obtained cross section data the Maxwellian averaged cross section (MACS) has been calculated by numerical integration.
4th International workshop on Nuclear Fission and Fission-Product Spectroscopy | 2009
O. Serot; C. Wagemans; S. Vermote; J Van Gils; B. Habert
The fission cross section of 245Cm was measured at the GELINA neutron facility of the Institute for Reference Materials and Measurements (IRMM) in Geel, Belgium, as a function of the incident neutron energy. The energy of the neutrons is determined applying the time of flight method using a flight path length of about 9 m. A highly enriched 245Cm sample (98.48%) was mounted back‐to‐back with a 10B sample in the centre of a vacuum chamber together with two surface barrier detectors positioned outside the neutron beam. One detector measured the 10B(n,α)7Li reaction products for the neutron flux determination, while the second one registered the 245Cm(n,f) fragments. A control measurement has been performed replacing the 245Cm sample with a 235U sample in order to check that the well‐known 235U(n,f) cross section can be reproduced. In comparison with previous 245Cm fission cross section measurements, our preliminary results show a nice improvement of the energy resolution, in particular below 20 eV where ver...
4th International workshop on Nuclear Fission and Fission-Product Spectroscopy | 2009
S. Vermote; Cyrillus Wagemans; O Serot; T Soldner; P Geltenbort; J Van Gils; I AlMahamid; G Tian; L Rao
During the last years, several Cm and Cf isotopes have been studied by our research group in the frame of a systematic investigation of gas emission characteristics in ternary fission. Here we report on new results on the energy distribution and the emission probability of 3H, 4He and He particles emitted in the spontaneous ternary fission of 250Cf (Eexc = 0 MeV) and in the neutron induced ternary fission of 249Cf (Eexc = 6.625 MeV). Both measurements were performed using suited and well‐calibrated ΔE−E telescope detectors, at the IRMM (Geel, Belgium) for the spontaneous fission and at the very intense neutron beam PF1b at the Institute Laue‐Langevin (Grenoble, France) for the neutron induced fission measurement. In this way, the existing database can be enlarged with new results for Z = 98 isotopes, which is important for the systematic investigation. Moreover, the investigation of the ‘isotope couple’ 249Cf(n,f)–250Cf(SF), together with corresponding data for other isotopes, will yield valuable informat...
Nuclear Physics | 2008
S. Vermote; C. Wagemans; O Serot; J. Heyse; J Van Gils; T Soldner; P Geltenbort
Nuclear Physics | 2010
S. Vermote; Cyrillus Wagemans; Olivier Serot; J. Heyse; J Van Gils; T Soldner; P Geltenbort; I AlMahamid; G Tian; L Rao
Physical Review C | 2007
L. De Smet; Cyrillus Wagemans; Jan Wagemans; J. Heyse; J Van Gils
Physical Review C | 2007
L. De Smet; Cyrillus Wagemans; Gert Goeminne; J. Heyse; J Van Gils