Details

Autor(en) / Beteiligte

• Hagiwara, Kaito
• Yano, Takatomi
• Tanaka, Tomoyuki
• Reen, Mandeep Singh
• Das, Pretam Kumar
• Lorenz, Sebastian
• Ou, Iwa
• Sudo, Takashi
• Yamada, Yoshiyuki
• Mori, Takaaki
• Kayano, Tsubasa
• Dhir, Rohit
• Koshio, Yusuke
• Sakuda, Makoto
• Kimura, Atsushi
• Nakamura, Shoji
• Iwamoto, Nobuyuki
• Harada, Hideo
• Wurm, Michael
• Focillon, William
• Gonin, Michel
• Ali, Ajmi
• Collazuol, Gianmaria

Titel

Gamma-ray spectrum from thermal neutron capture on gadolinium-157

Ist Teil von

• Progress of theoretical and experimental physics, 2019-02, Vol.2019 (2)

Ort / Verlag

Oxford University Press

Erscheinungsjahr

2019

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract 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.