Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout

Sweany, M.; Galindo-Tellez, A.; Brown, J.; Brubaker, E.; Dorrill, R.; Druetzler, A.; Kaneshige, N.; Learned, J.; Nishimura, K.; Bae, W.

doi:10.1016/j.nima.2019.02.063

Interaction position, time, and energy resolution in organic scintillator bars with dual-ended readout

Journal Article · Sun Feb 24 23:00:00 EST 2019 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2019.02.063· OSTI ID:1497634

Sweany, M. ^[1]; Galindo-Tellez, A. ^[2]; Brown, J. ^[1]; Brubaker, E. ^[1]; Dorrill, R. ^[2]; Druetzler, A. ^[2]; Kaneshige, N. ^[2]; Learned, J. ^[2]; Nishimura, K. ^[2]; Bae, W. ^[2]

Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Univ. of Hawaii, Honolulu, HI (United States)

We report on the position, timing, and energy resolution of a range of plastic scintillator bars and reflector treatments using dual-ended silicon photomultiplier readout. These measurements are motivated by the upcoming construction of an optically segmented single-volume neutron scatter camera, in which neutron elastic scattering off of hydrogen is used to kinematically reconstruct the location and energy of a neutron-emitting source. For this application, interaction position resolutions of about 10 mm and timing resolutions of about 1 ns are necessary to achieve the desired efficiency for fission-energy neutrons. The results presented here indicate that this is achievable with an array of 5 x 5 x 190 mm³ bars of EJ-204 scintillator wrapped in Teflon tape, read out with SensL’s J-series 6 x 6 mm² silicon photomultipliers. With two independent setups, we also explore the systematic variability of the position resolution, and show that, in general, using the difference in the pulse arrival time at the two ends is less susceptible to systematic variation than using the log ratio of the charge amplitude of the two ends. Finally, we measure a bias in the absolute time of interactions as a function of position along the bar: the measured interaction time for events at the center of the bar is 100 ps later than interactions near the SiPM.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1497634

Alternate ID(s):: OSTI ID: 1636365
OSTI ID: 1597562

Report Number(s):: SAND--2019-1708J; 672631

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 927; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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