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Now showing items 1 - 16 of 42945

  • 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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  • Ameliorating neutron damage in orthogonal-strip planar germanium detectors

    Jackson, E. G.   Hull, E. L.   Lister, C. J.   Pehl, R. H.  

    The segmentation of the electrodes of germanium detectors facilitates gamma ray imaging and tracking. Replacing the traditional n-type lithium drifted contact is a key to Finer segmentation. Amorphous-germanium is a promising alternative contact technology, and large, highly segmented detectors have been fabricated. One factor in adopting any new detector technology is its robustness in hostile environments. Therefore, to explore the effects of neutron damage on position sensitive amorphous-contact germanium gamma-ray detectors and investigate methods for mitigation and repair or damage, two detectors were intentionally exposed to a non-uniform neutron fluence of greater than 4(1) x 10(9) n/cm(2) produced in the Li-7(p, n)Be-7 reaction at the UMass Lowell Van-de-Graati accelerator. Post-irradiation tests were made on the counters by varying the electric field, the charge deposition rate, the operating temperature, and utilizing various annealing cycles in order to ascertain the robustness of their performance after irradiation. (C) 2014 Elsevier B.V. All rights reserved.
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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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  • 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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  • A QUALITY IMPROVEMENT PROJECT TO REDUCE INAPPROPRIATE BLOOD TESTING FOR HIP FRACTURE PATIENTS

    Jackson, E. G.   Stowe, S.  

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  • Laird G. Jackson, MD, FACMG

    Moran, Kathy  

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  • Dr. Laird G. Jackson Festschrift

    Noon, Sarah E.; Deardorff, Matthew A.; Krantz, Ian D.  

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  • Dr. Laird G. Jackson Festschrift

    Noon, Sarah E.   Deardorff, Matthew A.   Krantz, Ian D.  

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  • G. Jackson Rees (Liverpool, England)

    Brown, T. C. K.  

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  • G. Jackson Rees (Liverpool, England)

    T.C.K. Brown  

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  • G. Jackson Rees (Liverpool, England)

    T.C.K. Brown  

    No abstract is available for this article.
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  • On the Iterates of Jackson Type Operator $${G_{s,n}}$$ G s , n

    Zapryanova, T.; Souroujon, D.  

    In this paper, we study the limit of the iterates of a large class of linear bounded operators preserving constants. We obtain in addition the limit of the iterates of algebraic version of the trigonometric Jackson integrals. The proofs are based on spectral theory of linear operators.
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  • On the Iterates of Jackson Type Operator $${G_{s,n}}$$ G s , n

    Zapryanova, T.   Souroujon, D.  

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  • Trees as Crop Plants.by M. G. R. Cannell; J. E. Jackson

    Review by: Christine Cahalan  

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  • Trees as Crop Plants.by M. G. R. Cannell; J. E. Jackson

    Review by: Christine Cahalan  

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  • E G Gerald Roberts

    Owens   Geraint  

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