Gamma Ray Spectra from Thermal Neutron Capture on Gadolinium-155 and Natural Gadolinium

2019/06/28 by Tanaka, Tomoyuki, Hagiwara, Kaito, Gazzola, Enrico +18 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex)

paper · doi:10.48550/arxiv.1907.00788

Abstract

Natural gadolinium is widely used for its excellent thermal neutron capture cross section, because of its two major isotopes: ^{\rm 155}Gd and ^{\rm 157}Gd. We measured the γ-ray spectra produced from the thermal neutron capture on targets comprising a natural gadolinium film and enriched ^{\rm 155}Gd (in Gd₂O₃ powder) in the energy range from 0.11 MeV to 8.0 MeV, using the ANNRI germanium spectrometer at MLF, J-PARC. The freshly analysed data of the ^{\rm 155}Gd(n, γ) reaction are used to improve our previously developed model (ANNRI-Gd model) for the ^{\rm 157}Gd(n, γ) reaction, and its performance confirmed with the independent data from the ^{\rm nat}Gd(n, γ) reaction. This article completes the development of an efficient Monte Carlo model required to simulate and analyse particle interactions involving the thermal neutron captures on gadolinium in any relevant future experiments.

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