PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Neutrino Physics
Analysis of Gd(n,gamma) reaction with 155, 157 and natural Gd targets taken with JPARC-ANNRI and development of Gd(n,gamma) decay model for Gd-doped neutron/neutrino detectors
A. Ali,* T. Tanaka, T. Sudo, M. Reen, P. Das, R. Dir, Y. Yamada, I. Ou, T. Mori, T. Kayano, Y. Koshio, M. Sakuda, T. Yano, A. Kimura, S. Nakamura, N. Iwamoto, H. Harada, S. Lorenz, M. Wurm, W. Focillon, M. Gonin, G. Collazuol
*corresponding author
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Published on: August 02, 2019
Abstract
The importance of a good model for the $\gamma$-ray energy spectrum from the radiative thermal neutron capture on Gadolinium (Gd)
is specially increased in the present era of Gd-enhanced $\bar{\nu}_e$-search detectors. Its an essential prerequisite for MC studies to evaluate the neutron tagging efficiency, in order to enhance signal sensitivity in the Gd-loaded $\bar{\nu}_e$-search detectors. The $\gamma$-ray spectra produced from the thermal neutron capture on enriched gadolinium targets ($^{\rm 155}$Gd, $^{\rm 157}$Gd and Natural Gd) in the energy range 0.11 MeV to 8.0 MeV, were measured using the ANNRI Germanium Spectrometer at MLF, J-PARC. Based on the data acquired and a GEANT4 simulation of the ANNRI detector, we reported the energy spectrum of $^{\rm 157}$Gd(n, $\gamma$) and developed a $\gamma$-ray emission model of $^{\rm 157}$Gd(n, $\gamma$) in our previous publication. We now present the analysed data of $^{\rm 155}$Gd(n, $\gamma$) and $^{\rm nat}$Gd(n, $\gamma$) reactions, the energy spectra of $\gamma$-rays and an improved model for $^{\rm 155}$Gd(n, $\gamma$), $^{\rm 157}$Gd(n, $\gamma$) and $^{\rm nat}$Gd(n, $\gamma$) reactions. The consistency of the results from the devised model is checked among all the 14 germanium crystals, at the level of 15% spectral shape deviation at 0.2 MeV binning.
DOI: https://doi.org/10.22323/1.340.0120
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