Activation analysis is used in this work to measure the flux of a fast neutron beamline at a spallation source over a wide energy spectrum, extending from thermal to hundreds of MeV. The experimental method is based on the irradiation of multiple elements and measurements of activation γ-lines using a High Purity Germanium detector. The method for data analysis is then described in detail, with particular attention to the evaluation of uncertainties. The reactions have been chosen so to cover the whole energy range, using mainly (n, γ) for thermal and epithermal neutrons, and threshold reactions for the fast region. The variety of these reactions allowed for the unfolding of the neutron spectrum, using an algorithm based on a Bayesian statistical model, and limited correlations have been found between the energy groups

Chiesa, D., Nastasi, M., Cazzaniga, C., Rebai, M., Arcidiacono, L., Previtali, E., et al. (2018). Measurement of the neutron flux at spallation sources using multi-foil activation. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 902, 14-24 [10.1016/j.nima.2018.06.016].

Measurement of the neutron flux at spallation sources using multi-foil activation

Chiesa, D
;
Nastasi, M;Cazzaniga, C;Rebai, M;Previtali, E;Gorini, G;
2018

Abstract

Activation analysis is used in this work to measure the flux of a fast neutron beamline at a spallation source over a wide energy spectrum, extending from thermal to hundreds of MeV. The experimental method is based on the irradiation of multiple elements and measurements of activation γ-lines using a High Purity Germanium detector. The method for data analysis is then described in detail, with particular attention to the evaluation of uncertainties. The reactions have been chosen so to cover the whole energy range, using mainly (n, γ) for thermal and epithermal neutrons, and threshold reactions for the fast region. The variety of these reactions allowed for the unfolding of the neutron spectrum, using an algorithm based on a Bayesian statistical model, and limited correlations have been found between the energy groups
Articolo in rivista - Articolo scientifico
Neutron spectrum unfolding, Activation analysis, Fast neutrons, Spallation sources, Gamma-ray and neutron spectroscopy
English
2018
902
14
24
none
Chiesa, D., Nastasi, M., Cazzaniga, C., Rebai, M., Arcidiacono, L., Previtali, E., et al. (2018). Measurement of the neutron flux at spallation sources using multi-foil activation. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 902, 14-24 [10.1016/j.nima.2018.06.016].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/201096
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