Title: A Fast Ionization Chamber for Fission Cross-section Measurements at n_TOF
Authors: CALVIANI M.CENNINI P.KARADIMOS D.KETLEROV V.KONOVALOV V.FURMAN W.GOVERDOWSKI A.VLACHOUDIS V.ZANINI L.THE N_tof Collaboration
Citation: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP vol. 594 no. 2 p. 220-227
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2008
JRC N°: JRC47583
ISSN: 0168-9002
URI: http://dx.doi.org/10.1016/j.nima.2008.06.006
http://publications.jrc.ec.europa.eu/repository/handle/JRC47583
DOI: 10.1016/j.nima.2008.06.006
Type: Articles in Journals
Abstract: An ionization chamber with fast timing properties was built at CERN for measuring fission crosssections of minor actinides at the n_TOF neutron beam. The design of this new chamber and of the front-end electronics was optimized to match the innovative features of the n_TOF facility, in particular the high instantaneous neutron flux and low background. For the most radioactive isotopes, a special version of the chamber, designed according to the ISO2919 standards, was built in order to comply with the radioprotection requirements at CERN. The detector and front-end electronics are here described, together with the simulated and measured response to fission fragments and a-particles. The performances of the chamber during the first measurement campaign at n_TOF are presented, focusing in particular on the fast time response, the good background rejection capability, low-background and high detection efficiency.
JRC Institute:Institute for Reference Materials and Measurements

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