Instrumentation for correlated prompt n – γ emission studies in coincidence with fission fragments

Marin, S.; Tolstukhin, I. A.; Giha, N. P.; Oberling, M. B.; Knaack, R. A.; Kay, B. P.; Duke, D. L.; Montoya, K. B.; Connolly, D.; Loveland, W.; Chemey, A.; Pozzi, S. A.; Tovesson, F.

doi:10.1016/j.nima.2023.168027

Title: Instrumentation for correlated prompt n – γ emission studies in coincidence with fission fragments

Journal Article · Mon Jan 09 00:00:00 EST 2023 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2023.168027· OSTI ID:1989471

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University of Michigan, Ann Arbor, MI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Colorado School of Mines, Golden, CO (United States)
Oregon State University, Corvallis OR (United States)

Recent theoretical and experimental results have brought renewed interest and focus on the topic of fission fragment angular momentum. Measurements of neutrons and rays in coincidence with fission fragments remain the most valuable tool in the exploration of fission physics. To achieve these scientific goals, we have developed a system that combines a state-of-the-art fission fragment detector and n – γ radiation detectors. A new twin Frisch-gridded ionization chamber has been designed and constructed for use with a spontaneous fission source and an array of forty trans-stilbene organic scintillators (FS-3) at Argonne National Laboratory. The new ionization chamber design we present in this work aims at minimizing particle attenuation in the chamber walls, and provides a compact apparatus that can be fit inside existing experimental systems. The ionization chamber is capable of measuring fission fragment masses and kinetic energies, whereas the FS-3 provides neutron and γ-ray multiplicities and spectra. Here, the details of both detector assemblies are presented along with the first experimental results of this setup. Planned event-by-event analysis and future experiments are briefly discussed.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003920

OSTI ID:: 1989471

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1048; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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