High precision neutron inelastic cross sections on 16 O

International audienceThis work reports partial results of a (n, nγ) measurement on 16 O. The γ rays of interest from the inelastic channel were detected using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the Geel Electron Linear Accelerator (GELINA) neutron source. A very thick (32.30(4) mm) SiO 2 target was used. The main goal was to determine the angle-integrated γ-production cross section for the most important transitions. In this work we report the results for the main 16 O transition and we emphasize a consistency check aiming to ensure data reliability. Our results are compared with theoretical calculations performed using the talys 1.8 code and with previously reported experimental data

High precision neutron inelastic cross sections on

This work reports partial results of a (n, nγ) measurement on 16O. The γ rays of interest from the inelastic channel were detected using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the Geel Electron Linear Accelerator (GELINA) neutron source. A very thick (32.30(4) mm) SiO2 target was used. The main goal was to determine the angle-integrated γ-production cross section for the most important transitions. In this work we report the results for the main 16O transition and we emphasize a consistency check aiming to ensure data reliability. Our results are compared with theoretical calculations performed using the TALY

Neutron inelastic cross section measurements on 54Fe

A 54Fe(n, n'γ) cross section measurement was performed at the Geel Electron LINear Accelerator of EC-JRC, Geel using the Gamma Array for Inelastic Neutron Scattering spectrometer and a 235U fission chamber for flux normalization. The experimental results are presented in comparison with talys 1.9 default and tuned calculations. The tuned calculation, implying modifications of the optical model parameters, improved significantly the description of the experimental values and led to interesting conclusions regarding the interaction of the 54Fe nucleus with neutrons. Since the results of these calculations were already presented extensively in a dedicated paper, the present article focuses on details related to the experimental particularities and data analysis procedure

Neutron inelastic cross section measurements for nat Ti

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Neutron-induced inelastic γ-production cross sections on 58,60,64 Ni

International audienceThis paper reports partial results of a (n, n’γ) measurement on nickel. The inelastic channel was measured using the Gamma Array for Inelastic Neutron Scattering (GAINS) spectrometer at the 100-m measurement cabin of the Geel Electron Linear Accelerator (GELINA) neutron source of the European Commission’s Joint Research Centre (EC-JRC) in Geel, Belgium. Using γ spectroscopy, we were able to extract angle-integrated production cross sections for several γ rays but we report here only the results for the main transition in 58 Ni. We discuss however in detail the observed discrepancy between our data and other experiments (especially the work of Voss et al. ). We also shortly comment on the quality of the neutron-target optical model potential in describing the inelastic data in this mass region. The calculations were performed using the talys 1.9 code in the default settings

New equipment for neutron scattering cross-section measurements at GELINA

Two new experimental setups are being developed at European Commission’s Joint Research Centre in Geel, Belgium. The scintillator array ELISA (ELastic and Inelastic Scattering Array) is for high-quality neutron scattering cross section and angular distribution measurements. It has the capability to separate neutron-and photon-induced events via pulse-shape analysis. Inelastic scattering can also be resolved from the elastic channel. The ELISA setup and data analysis procedure were validated by performing measurements using carbon and iron samples. The DELCO spectrometer (Detection of ELectrons from COnversion) is intended for inelastic neutron scattering cross-section measurements in cases where the detection of γ rays is not feasible. The current status of DELCO, results from the first tests, and future prospects will be discussed

Neutron inelastic cross section measurements on 58,60^{58,60}Ni

International audienceA natural nickel sample was used at the GELINA (Geel Electron LINear Accelerator) neutron source of the European Commission, Joint Research Centre, Geel to measure the neutron inelastic cross sections. The GAINS (Gamma Array for Inelastic Neutron Scattering) spectrometer was employed to detect the emitted γ rays while a 235 U fission chamber monitored the neutron flux. We report the preliminary production cross sections corresponding to the first transitions in 58,60 Ni in comparison with previously reported data and with talys 1.9 calculations performed using the default input parameters

Excitation function measurements of the elastic and inelastic scattering of protons in the 1600 to 5300 keV energy range for Li and F

Excitation functions have been obtained for the 19F(p,p’γ)19F (Eγ= 110, 197, 1236, 1349+1357 keV), 7Li(p,nγ)7Be (Eγ = 429 keV) and 7Li (p,p’γ) 7Li (Eγ = 478 keV) reactions for proton energies of 1600 to 5300 keV, with an energy step of 10 and 50 keV. The γ-rays were detected by a HPGe detector placed at an angle of 135° with respect to the beam direction. The purpose of these measurements is to improve the cross-sections accuracies necessary to set up PIGE (Proton Induced Gamma-ray Emission) as an accurate standard less technique for lithium and fluorine, and to test and improve theoretical models and codes such as TALYS 1.9. In parallel, the differential proton elastic scattering cross-sections on 6Li, 7Li, 19F at 165° in the laboratory frame were also measured

The past and the future of the GAINS spectrometer @ GELINA

GAINS (Gamma Array for Inelastic Neutron Scattering), currently installed at the GELINA (Geel Electron Linear Accelerator) neutron source of the EC-JRC (European Commission-Joint Research Centre), is one of the best instruments available worldwide for measuring high resolution, low uncertainty neutron inelastic cross-section data relevant for both fundamental research and nuclear physics applications (like Generation IV facilities). It features 12 HPGe detectors coupled with a 235 U fission chamber for neutron flux monitoring. The paper presents a short history of the GAINS development over the years and reviews some of the main experimental results together with plans for future experiments