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|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|
|Type:||Articles in periodicals and books|
|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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