Development of a liquid scintillator based active fission target for FIPPS

F. Kandzia (1) , G. Belier (2) , C. Michelagnoli (1) , J. Aupiais (2) , M. Barani , J. Dudouet (3) , Ch. E. Düllmann , Ł. W. Iskra , M. Jentschel (1) , Y.H. Kim (1) , U. Köster (1) , A. Turturica

1 ILL - Institut Laue-Langevin
2 DAM - Direction des Applications Militaires
3 IPNL - Institut de Physique Nucléaire de Lyon

An active fission target has been developed for the FIPPS instrument at ILL, enabling for the first time an efficient suppression of $\upbeta $-delayed $\upgamma $ rays in high-resolution and high-efficiency $\upgamma $-ray spectroscopy of fission fragments at a neutron beam. The target is based on a liquid scintillator in which the actinide is dissolved, resulting in a 4$\pi $ fragment detection. Measurements have been performed with $^{233, 235}$U, with a fission tagging efficiency of 97.8(25)%. The high efficiency, together with the good time resolution of the scintillator target, provide high-selectivity data for $\upgamma $-ray spectroscopy studies of fission fragments.

Domaines: Instrumentations et Détecteurs [physics.ins-det]

F. Kandzia, G. Belier, C. Michelagnoli, J. Aupiais, M. Barani, et al.. Development of a liquid scintillator based active fission target for FIPPS. Eur.Phys.J.A, 2020, 56 (8), pp.207. ⟨10.1140/epja/s10050-020-00201-0⟩. ⟨hal-02934068⟩