Speaker
Andreas Oberstedt
(Örebro University)
Description
A challenging task within the modelling of new generation reactor neutron kinetics is the calculation of the gamma-heat deposition e.g. in steel and ceramics reflectors without UO2 blankets, which is required to be known with an uncertainty as low as 7.5%. A major difficulty in measuring the competition between neutron and gamma-ray emission during fission fragment de-excitation is the suppression of background gamma-rays induced by prompt fission neutrons in the gamma-detector. A common method is to distinguish between gamma-rays and neutrons by their respective different time-of-flight, which however is limited by the timing resolution of the detector (not better than 5 ns for NaI). A promising approach seems to be the use of recently developed cerium-doped lanthanum halide crystal scintillation detectors.
Recently we performed an experiment at the 10 MW research reactor at the Institute of Isotopes in Budapest, dedicated to the measurement of the fission-fragment mass and kinetic energy distribution as well as prompt fission gamma-rays from thermal (cold) neutrons on 235U. The gamma-rays were measured with three LaCl3:Ce detectors and one LaBr3:Ce detector. We report on the status of the data analysis and present experimental results from the experiments as obtained thus far.
Author
Andreas Oberstedt
(Örebro University)
Co-authors
Alf Göök
(TU Darmstadt and Örebro University)
Daniel Cano-Ott
(CIEMAT Madrid)
Franz-Josef Hambsch
(EC-JRC IRMM Geel)
Johan Karlsson
(Örebro University)
Karman Takacs
(IKI Budapest)
Lazlo Szentmiklosi
(IKI Budapest)
Robert Billnert
(Örebro University)
Ruxandra Borcea
(EC-JRC IRMM Geel)
Stephan Oberstedt
(EC-JRC IRMM Geel)
Tamas Belgya
(IKI Budapest)
Trino Martinez Perez
(CIEMAT Madrid)
Zoltan Kis
(IKI Budapest)
