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Now showing items 1 - 4 of 4

  • Applications of (CLYC)-L-7 scintillators in fast neutron spectroscopy

    Brown, T.   Chowdhury, P.   Doucet, E.   Jackson, E. G.   Lister, C. J.   Mitchell, A. J.   Morse, C.   Rogers, A. M.   Wilson, G. L.   D'Olympia, N.   Devlin, M.   Fotiades, N.   Gomez, J. A.   Mosby, S. M.   Nelson, R. O.  

    The capabilities of Li-7-enriched Cs-2 (LiYCl6)-Li-7 ((CLYC)-L-7) scintillation detectors for fast neutron spectroscopy are explored in benchmark experiments that exploit its excellent pulse-shape discrimination between neutrons and gamma rays, and its unprecedented approximate to 10% energy resolution for fast neutrons in the few MeV range, obtained through the Cl-35(n,p) reaction. Energy- and angle-resolved elastic and inelastic neutron scattering cross-section measurements of Fe-56(n,n') were performed at Los Alamos National Laboratory with a pulsed white neutron source and an array of 1'' x 1'' (CLYC)-L-7 crystals. The results convincingly establish the utility of this dual n/gamma scintillator for fast neutron spectroscopy. Intrinsic efficiency measurements of both 1'' x 1'' and the first ever 3'' x 3'' C7LYC crystal have been initiated, using mono-energetic fast neutron beams at UMass Lowell generated via the Li-7(p,n) reaction. The spectroscopic capabilities and potential of (CLYC)-L-7 are discussed in the context of developing this emerging scintillator for targeted science applications.
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  • Optimizing Cs2LiYCl6 for fast neutron spectroscopy

    D'Olympia, N.   Chowdhury, P.   Guess, C. J.   Harrington, T.   Jackson, E. G.   Lakshmi, S.   Lister, C. J.   Glodo, J.   Hawrami, R.   Shah, K.   Shirwadkar, U.  

    Cs2UYCl6 (CLYC) has generated recent interest as a thermal neutron detector due to its excellent n/gamma-ray pulse-shape discrimination and energy resolution. Here, the capabilities of CLYC as a fast neutron detector and spectrometer are reported. A 1 in. x 1 in. CLYC detector was used to measure the response of mono-energetic neutrons over a range of 0.8-2.0 MeV produced via the Li-7(p,n) reaction at the University of Massachusetts Lowell 5.5 MV Van de Graaff accelerator. A broad continuum from the Li-6(n, alpha) reaction was observed, as well as additional peaks below the thermal capture peak. Based on possible reactions in CLYC, the additional peaks are determined to be due to the Cl-35(n,p)S-35 reaction, with a Q-value of +615 keV, and corroborated in simulations using MCNPX. The average resolution of 9% for these peaks makes CLYC a promising candidate for a fast neutron spectrometer. Published by Elsevier B.V.
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  • Sub-nanosecond nuclear half-life and time-of-flight measurements with CeBr3

    D'Olympia, N.   Lakshmi, S.   Chowdhury, P.   Jackson, E. G.   Glodo, J.   Shah, K.  

    CeBr3 is a new fast scintillator with timing and energy resolution similar to LaBr3:Ce. The excellent timing resolution, measured here to be 93 ps at 511 keV for 1 cm(3) crystals, naturally lends itself to direct electronic measurements of excited nuclear state lifetimes in the nanosecond and sub-nanosecond range. To demonstrate this, half-lives of a 1.40 ns isomer in Sm-152 and 537 ps isomer in Hf-177 were directly measured using the delayed coincidence technique. With its fast timing, high light output and high efficiency, the possibility of CeBr3 as a time-of-flight PET detector was also explored through gamma-ray time-of-flight measurements. Published by Elsevier B.V.
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  • Pulse-shape analysis of CLYC for thermal neutrons, fast neutrons, and gamma-rays

    D'Olympia, N.   Chowdhury, P.   Lister, C. J.   Glodo, J.   Hawrami, R.   Shah, K.   Shirwadkar, U.  

    Cs2LiYCl6:Ce (CLYC) has been demonstrated to be sensitive to thermal neutrons via the Li-6(n, alpha)t reaction, and recently to fast neutrons via the Cl-35(n,p) reaction. The scintillation properties of CLYC have been investigated in more detail to further understand its capabilities. Pulses from thermal neutron, fast neutron, and gamma-ray induced excitations were captured, digitized over a 16 mu s time range, and analyzed to identify the scintillation mechanisms responsible for the observed shapes. Additionally, the timing resolutions of CLYC crystals of different sizes were measured in coincidence with a fast CeBr3 scintillator. The effect of high count rates on fast neutron energy resolution and pulse-shape discrimination was investigated up to 45 kHz. Published by Elsevier B.V.
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