Time-of-Flight and Position Resolution in Proposed Detectors DR. WILLIAM TIREMAN NORTHERN MICHIGAN UNIVERSITY MR. DANIEL WILBERN NMU RESEARCH ASSISTANT

Goals  Measure the dispersion in the time-of-flight of cosmic rays between two plastic scintillator detectors  Measure the position resolution for a cosmic ray hit on the test detector

Neutron Research Red – charged particle taggers Green – Neutron Bars Neutrons knock protons out and they scatter up and down into the detectors Picture from: Dr. Andrei Semenov, University of Regina, Canada

Pictures from: Dr. Andrei Semenov, University of Regina, Canada

General Detector Setup/Circuit

Measurement Parameters

Typical Spectra

Plan A – 120 o Bend Configuration

Plan B – 90 o Configuration

Conclusion ConfigurationPosition Resolution (cm) Position ΔT FWHM (ps) Time Dispersion (ps) Plan A8.91 ± ± 9316 ± 15 Plan B6.78 ± ± 6235 ± 7 Madey et. al.< 2.5NA155 ± 5

References Madey, R. et al. (1983). Large volume neutron detectors with subnanosecond time dispersions. Nuclear Instruments and Methods in Physics Research, 214(2-3), doi: / (83)

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