TY - JOUR
T1 - Gamma-ray spectrum from thermal neutron capture on gadolinium-157
AU - Hagiwara, Kaito
AU - Yano, Takatomi
AU - Tanaka, Tomoyuki
AU - Reen, Mandeep Singh
AU - Das, Pretam Kumar
AU - Lorenz, Sebastian
AU - Ou, Iwa
AU - Sudo, Takashi
AU - Yamada, Yoshiyuki
AU - Mori, Takaaki
AU - Kayano, Tsubasa
AU - Dhir, Rohit
AU - Koshio, Yusuke
AU - Sakuda, Makoto
AU - Kimura, Atsushi
AU - Nakamura, Shoji
AU - Iwamoto, Nobuyuki
AU - Harada, Hideo
AU - Wurm, Michael
AU - Focillon, William
AU - Gonin, Michel
AU - Ali, Ajmi
AU - Collazuol, Gianmaria
N1 - Funding Information:
This work is supported by the Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) No. 26104006. It benefited from the use of the neutron beam of the JSNS and the ANNRI detector at the Material and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex.
Publisher Copyright:
© 2019 The Author(s) 2019. Published by Oxford University Press on behalf of the Physical Society of Japan.
PY - 2019/2/1
Y1 - 2019/2/1
N2 - We have measured the $\gamma$-ray energy spectrum from the thermal neutron capture, ${}{157}$Gd$(n,\gamma)$, on an enriched ${157}$Gd target (Gd$ {2}$O$ {3}$) in the energy range from 0.11 MeV up to about 8 MeV. The target was placed inside the germanium spectrometer of the ANNRI detector at J-PARC and exposed to a neutron beam from the Japan Spallation Neutron Source (JSNS). Radioactive sources (${60}$Co, ${137}$Cs, and ${152}$Eu) and the ${35}$Cl($n$,$\gamma$) reaction were used to determine the spectrometer's detection efficiency for $\gamma$ rays at energies from 0.3 to 8.5 MeV. Using a Geant4-based Monte Carlo simulation of the detector and based on our data, we have developed a model to describe the $\gamma$-ray spectrum from the thermal ${}{157}$Gd($n$,$\gamma$) reaction. While we include the strength information of 15 prominent peaks above 5 MeV and associated peaks below 1.6 MeV from our data directly into the model, we rely on the theoretical inputs of nuclear level density and the photon strength function of ${}{158}$Gd to describe the continuum $\gamma$-ray spectrum from the ${}{157}$Gd($n$,$\gamma$) reaction. Our model combines these two components. The results of the comparison between the observed $\gamma$-ray spectra from the reaction and the model are reported in detail.
AB - We have measured the $\gamma$-ray energy spectrum from the thermal neutron capture, ${}{157}$Gd$(n,\gamma)$, on an enriched ${157}$Gd target (Gd$ {2}$O$ {3}$) in the energy range from 0.11 MeV up to about 8 MeV. The target was placed inside the germanium spectrometer of the ANNRI detector at J-PARC and exposed to a neutron beam from the Japan Spallation Neutron Source (JSNS). Radioactive sources (${60}$Co, ${137}$Cs, and ${152}$Eu) and the ${35}$Cl($n$,$\gamma$) reaction were used to determine the spectrometer's detection efficiency for $\gamma$ rays at energies from 0.3 to 8.5 MeV. Using a Geant4-based Monte Carlo simulation of the detector and based on our data, we have developed a model to describe the $\gamma$-ray spectrum from the thermal ${}{157}$Gd($n$,$\gamma$) reaction. While we include the strength information of 15 prominent peaks above 5 MeV and associated peaks below 1.6 MeV from our data directly into the model, we rely on the theoretical inputs of nuclear level density and the photon strength function of ${}{158}$Gd to describe the continuum $\gamma$-ray spectrum from the ${}{157}$Gd($n$,$\gamma$) reaction. Our model combines these two components. The results of the comparison between the observed $\gamma$-ray spectra from the reaction and the model are reported in detail.
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U2 - 10.1093/ptep/ptz002
DO - 10.1093/ptep/ptz002
M3 - Article
AN - SCOPUS:85074141995
VL - 2019
JO - Progress of Theoretical and Experimental Physics
JF - Progress of Theoretical and Experimental Physics
SN - 2050-3911
IS - 2
M1 - 023D01
ER -