Browsing by Author "Currie, S. A."

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    A new method for measuring the neutron lifetime using an in situ neutron detector
    Morris, C. L.; Adamek, E. R.; Broussard, L. J.; Callahan, N. B.; Clayton, S. M.; Cude-Woods, C.; Currie, S. A.; Ding, X.; Fox, W.; Hickerson, K. P.; Hoffbauer, M. A.; Holley, A. T.; Komives, A.; Liu, C. Y.; Makela, M.; Pattie, R. W., Jr.; Ramsey, J.; Salvat, D. J.; Saunders, A.; Seestrom, S. J.; Sharapov, E. I.; Sjue, S. K.; Tang, Z.; Vanderwerp, J.; Vogelaar, R. Bruce; Walstrom, P. L.; Wang, Z.; Wei, Wanchun; Wexler, J. W.; Womack, T. L.; Young, A. R.; Zeck, B. A. (2017-05)
    In this paper, we describe a new method for measuring surviving neutrons in neutron lifetime measurements using bottled ultracold neutrons (UCN), which provides better characterization of systematic uncertainties and enables higher precision than previous measurement techniques. An active detector that can be lowered into the trap has been used to measure the neutron distribution as a function of height and measure the influence of marginally trapped UCN on the neutron lifetime measurement. In addition, measurements have demonstrated phase-space evolution and its effect on the lifetime measurement. (C) 2017 Author(s).
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    Performance of the Los Alamos National Laboratory spallation-driven solid-deuterium ultra-cold neutron source
    Saunders, A.; Makela, M.; Bagdasarova, Y.; Back, H. O.; Boissevain, J. G.; Broussard, L. J.; Bowles, T. J.; Carr, Rachel E.; Currie, S. A.; Filippone, B. W.; Garcia, A.; Geltenbort, P.; Hickerson, K. P.; Hill, R. E.; Hoagland, J.; Hoedl, S. A.; Holley, A. T.; Hogan, G.; Ito, T. M.; Lamoreaux, Steve; Liu, Chen-Yu; Liu, J.; Mammei, R. R.; Martin, J.; Melconian, D.; Mendenhall, M. P.; Morris, C. L.; Mortensen, R. N.; Pattie, R. W., Jr.; Pitt, M.; Plaster, B.; Ramsey, J.; Rios, R.; Sallaska, A. L.; Seestrom, S. J.; Sharapov, E. I.; Sjue, S.; Sondheim, W. E.; Teasdale, W.; Young, A. R.; VornDick, B.; Vogelaar, R. Bruce; Wang, Z.; Xu, Yanping (AIP Publishing, 2013-01)
    In this paper, we describe the performance of the Los Alamos spallation-driven solid-deuterium ultra-cold neutron (UCN) source. Measurements of the cold neutron flux, the very low energy neutron production rate, and the UCN rates and density at the exit from the biological shield are presented and compared to Monte Carlo predictions. The cold neutron rates compare well with predictions from the Monte Carlo code MCNPX and the UCN rates agree with our custom UCN Monte Carlo code. The source is shown to perform as modeled. The maximum delivered UCN density at the exit from the biological shield is 52(9) UCN/cc with a solid deuterium volume of similar to 1500 cm(3). (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4770063]