Cyriel Wagemans

Experimental determination of the 14 N ( n , p ) 14 C reaction cross section for thermal neutrons

The 17O(n_th,alpha)14C reaction cross section was determined at the high flux reactor of the ILL in Grenoble relative to the known 14N(n_th,p)14C cross section. The 17O(n_th,alpha)14C measurements were performed with several highly enriched oxygen gas samples and the flux calibration was done with 14N_2 from the air. This resulted in a precise value of (244+/-7)mb for the 17O(n_th,alpha)14C cross section.

The 234U(nth, f) cross section revisited

Abstract The 234U(nth,f) cross section previously determined at the high-flux reactor of the Institut Laue-Langevin in Grenoble was revised using a corrected number of atoms in the 234U deposit, yielding a value of (67 ± 14) mb.

Characteristics of the 50V(nth,p)50Ti reaction.

The [sup 50]V([ital n][sub th],[ital p])[sup 50]Ti reaction has been studied at a very clean thermal neutron beam of the ILLs high flux reactor. An accurate cross section value of (0.71[plus minus]0.04) mb has been determined, as well as a value of (0.002 364[plus minus]0.000 008) u for the [sup 50]V-[sup 50]Ti mass difference. Possible applications in nuclear astrophysics and in reactor technology are pointed out.

Measurement of the 77Se,99Ru,101Ruand 123Te(n,α)Cross Sections with Thermal Neutrons

Results of (n,{alpha}) cross section measurements performed at the high flux reactor of the Institute Laue-Langevin in Grenoble (France) are reported. Cross section values are given for the {alpha}{sub 0}, {alpha}{sub 1} and {alpha}{sub 2} transitions in {sup 77}Se(n,{alpha}){sup 74}Ge, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 99}Ru(n,{alpha}){sup 96}Mo, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 101}Ru(n,{alpha}){sup 98}Mo and the {alpha}{sub 0}, {alpha}{sub 1} and {gamma}{alpha} transitions in {sup 123}Te(n,{alpha}){sup 120}Sn. Corresponding resonance data reported in the literature are confronted with these results.

Measurement of the 77Se, 99Ru, 101Ru and 123Te(n,α) Cross Sections with Thermal Neutrons

Results of (n,{alpha}) cross section measurements performed at the high flux reactor of the Institute Laue-Langevin in Grenoble (France) are reported. Cross section values are given for the {alpha}{sub 0}, {alpha}{sub 1} and {alpha}{sub 2} transitions in {sup 77}Se(n,{alpha}){sup 74}Ge, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 99}Ru(n,{alpha}){sup 96}Mo, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 101}Ru(n,{alpha}){sup 98}Mo and the {alpha}{sub 0}, {alpha}{sub 1} and {gamma}{alpha} transitions in {sup 123}Te(n,{alpha}){sup 120}Sn. Corresponding resonance data reported in the literature are confronted with these results.

Measurement of the {sup 77}Se, {sup 99}Ru, {sup 101}Ru and {sup 123}Te(n,{alpha}) Cross Sections with Thermal Neutrons

Results of (n,{alpha}) cross section measurements performed at the high flux reactor of the Institute Laue-Langevin in Grenoble (France) are reported. Cross section values are given for the {alpha}{sub 0}, {alpha}{sub 1} and {alpha}{sub 2} transitions in {sup 77}Se(n,{alpha}){sup 74}Ge, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 99}Ru(n,{alpha}){sup 96}Mo, the {alpha}{sub 0} and {alpha}{sub 1} transitions in {sup 101}Ru(n,{alpha}){sup 98}Mo and the {alpha}{sub 0}, {alpha}{sub 1} and {gamma}{alpha} transitions in {sup 123}Te(n,{alpha}){sup 120}Sn. Corresponding resonance data reported in the literature are confronted with these results.

The ternary alpha energy distribution revisited

The shape of the energy distribution of the particles emitted in ternary fission has been studied since the discovery of the phenomenon for a large variety of fissioning systems. The general tendency of the observations is that most particles have a Gaussian-shaped energy distribution, except the a-particles, for which mostly an important non-Gaussian tailing on the low-energy side is reported. The origin of this tailing is generally ascribed to the decay of ternary ’He particles in an a-particle and a neutron. Since the experiments reported in the literature are rarely optimised for measuring the low-energy part of the aspectrum, we realised good experimental conditions for studying the 235U(nh,f) ternary a energy distribution at the High Flux Reactor of the ILL in Grenoble. Thanks to a very intense and clean neutron beam, a small, very thin sample of highly enriched U could be used, with an activity of only 1.6 Bq. So the measurements could be done without absorber in between the sample and the AE-E detector. With the resulting low detection limit of 6 MeV, a clearly asymmetric energy distribution was obtained, in agreement with most data in the literature.

Experimental determination of the14N(n,p)14Creaction cross section for thermal neutrons

The 17O(n_th,alpha)14C reaction cross section was determined at the high flux reactor of the ILL in Grenoble relative to the known 14N(n_th,p)14C cross section. The 17O(n_th,alpha)14C measurements were performed with several highly enriched oxygen gas samples and the flux calibration was done with 14N_2 from the air. This resulted in a precise value of (244+/-7)mb for the 17O(n_th,alpha)14C cross section.

Experimental determination of the 17o(n_th,alpha)14c reaction cross-section

The 17O(n_th,alpha)14C reaction cross section was determined at the high flux reactor of the ILL in Grenoble relative to the known 14N(n_th,p)14C cross section. The 17O(n_th,alpha)14C measurements were performed with several highly enriched oxygen gas samples and the flux calibration was done with 14N_2 from the air. This resulted in a precise value of (244+/-7)mb for the 17O(n_th,alpha)14C cross section.

Characteristics of the [sup 50]V([ital n][sub th],[ital p])[sup 50]Ti reaction

The [sup 50]V([ital n][sub th],[ital p])[sup 50]Ti reaction has been studied at a very clean thermal neutron beam of the ILLs high flux reactor. An accurate cross section value of (0.71[plus minus]0.04) mb has been determined, as well as a value of (0.002 364[plus minus]0.000 008) u for the [sup 50]V-[sup 50]Ti mass difference. Possible applications in nuclear astrophysics and in reactor technology are pointed out.