TY - JOUR
T1 - Angular correlation of the two gamma rays produced in the thermal neutron capture on gadolinium-155 and gadolinium-157
AU - Goux, Pierre
AU - Glessgen, Franz
AU - Gazzola, Enrico
AU - Reen, Mandeep Singh
AU - Focillon, William
AU - Gonin, Michel
AU - Tanaka, Tomoyuki
AU - Hagiwara, Kaito
AU - Ali, Ajmi
AU - Sudo, Takashi
AU - Koshio, Yusuke
AU - Sakuda, Makoto
AU - Collazuol, Gianmaria
AU - Kimura, Atsushi
AU - Nakamura, Shoji
AU - Iwamoto, Nobuyuki
AU - Harada, Hideo
AU - Wurm, Michael
N1 - Publisher Copyright:
© The Author(s) 2023.
PY - 2023/6/1
Y1 - 2023/6/1
N2 - The ANNRI-Gd collaboration studied in detail the single γ -ray spectrum produced from the thermal neutron capture on 155Gd and 157Gd in our previous publications. Gadolinium targets were exposed to a neutron beam provided by the Japan Spallation Neutron Source (JSNS) in J-PARC, Japan. In the present analysis, one new additional coaxial germanium crystal was used in combination with the 14 germanium crystals in the cluster detectors to study the angular correlation of the two γ rays emitted in the same neutron capture. We present for the first time angular correlation functions for two γ rays produced during the electromagnetic cascade transitions in the (n, γ ) reactions on 155Gd and 157Gd. As expected, we observe mild angular correlations for the strong, but rare transitions from the resonance state to the two energy levels of known spin-parities. Contrariwise, we observe negligibly small angular correlations for arbitrary pairs of two γ rays produced in the majority of cascade transitions from the resonance state to the dense continuum states.
AB - The ANNRI-Gd collaboration studied in detail the single γ -ray spectrum produced from the thermal neutron capture on 155Gd and 157Gd in our previous publications. Gadolinium targets were exposed to a neutron beam provided by the Japan Spallation Neutron Source (JSNS) in J-PARC, Japan. In the present analysis, one new additional coaxial germanium crystal was used in combination with the 14 germanium crystals in the cluster detectors to study the angular correlation of the two γ rays emitted in the same neutron capture. We present for the first time angular correlation functions for two γ rays produced during the electromagnetic cascade transitions in the (n, γ ) reactions on 155Gd and 157Gd. As expected, we observe mild angular correlations for the strong, but rare transitions from the resonance state to the two energy levels of known spin-parities. Contrariwise, we observe negligibly small angular correlations for arbitrary pairs of two γ rays produced in the majority of cascade transitions from the resonance state to the dense continuum states.
U2 - 10.1093/ptep/ptad059
DO - 10.1093/ptep/ptad059
M3 - Article
AN - SCOPUS:85161701731
SN - 2050-3911
VL - 2023
JO - Progress of Theoretical and Experimental Physics
JF - Progress of Theoretical and Experimental Physics
IS - 6
M1 - ptad059
ER -