Measurement of high-energy prompt fission
-ray emission in
U (
)
Makii, Hiroyuki
; Nishio, Katsuhisa
; Hirose, Kentaro
; Orlandi, R.
; L
guillon, R.*; Ogawa, Tatsuhiko
; Soldner, T.*; K
ster, U.*; Hambsch, F.-J.*; Kawano, Toshihiko*; A
che, M.*; Astier, A.*; Czajkowski, S.*; Frost, R. J. W.*; Guo, S.*; Mathieu, L.*; Otsuki, Tsutomu*; Petrache, C. M.*; Pollitt, A.*; Sekimoto, Shun*; Takamiya, Koichi*; Tsekhanovich, I.*
Prompt fission
-ray spectra (PFGS) are important as they allow us to study the structure and de-excitation process of neutron-rich fission fragments. They are also required for the design of the Gen-IV fast reactors and advanced light-water reactors. For spontaneous fission of
Cf,
Cf(sf), prompt fission
rays were observed up to energies of about
20 MeV. For neutron-induced fissions, however, the measured PFGS are limited below
= 9
10 MeV. In this work we extended the measurement of the PFGS for cold neutron-induced fission of
U up to
20 MeV by gaining a factor of about 10
in statistics compared to the measurements performed so far. The measurement was carried out at the PF1B cold-neutron facility of the ILL, Grenoble, France. The spectrum exhibits local bump structures at
4 MeV and
6 MeV and also a broad one at
15 MeV. In this contribution, we will discuss the origins of the bump structures in comparison with the statistical Hauser-Feshbach model calculation.