Measurement of high-energy prompt gamma-rays from the fission of 235U(nth,f)
We propose to measure the prompt fission gamma-ray spectrum (PFGS) for thermal neutron-induced fission of 235U up to energies high enough to observe the giant dipole resonance (GDR) of fission fragments for the first time in neutron-induced fission. We will use newly developed high-efficiency LaBr3(Ce) detectors (4" diameter x 5" length). The experimental program is also connected to the decommissioning of the nuclear-fuel debris in damaged Fukushima atomic power plants in Japan. The decommissioning must be done without reaching the criticality of the fuel debris. This necessitates a surveillance detector to moitor the fission rate in the debris. The prompt gamma-rays in fission with energies larger than 6 MeV, which corresponds to the highest energy for background gamma-rays from the debris, would be detected to monitor the fission rate. The surveillance detector is designed to be sensitive to the high-energy region of PFGS including the GDR.
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NISHIO Katsuhisa; AICHE MOURAD; Andrei Andreyev; ASTIER Alain; AUDOUIN Laurent; CZAJKOWSKI Serge; ENDOU Yoshihiro; FROST Robert; GUO Song; HAMBSCH Franz-Josef; HIROSE Kentaro; JENKINS David; JURADO Beatriz; KOESTER Ulli; LEGUILLON Romain; MAKII Hiroyuki; MARINI Paola; MATHIEU Ludovic; NESVIZHEVSKY Valery; NISHINAKA Ichiro; OBERSTEDT Stephan; Tatsuhiko Ogawa; ORLANDI Riccardo; PETRACHE Costel; POLLITT Andrew; SMITH Gavin; SOLDNER Torsten; TASSAN-GOT Laurent and TSEKHANOVICH Igor. (2015). Measurement of high-energy prompt gamma-rays from the fission of 235U(nth,f). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.3-07-363
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