Development of a liquid scintillator based active fission target for FIPPS
Résumé
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.
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