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Evan Adamek
Indiana University Bloomington
23Publications
4H-index
56Citations
Publications 24
Newest
#1Nathan CallahanH-Index: 5
#2Chen-Yu LiuH-Index: 3
Last.B. A. ZeckH-Index: 7
view all 40 authors...
In the UCN{\tau} experiment, ultracold neutrons (UCN) are confined by magnetic fields and the Earth's gravitational field. Field-trapping mitigates the problem of UCN loss on material surfaces, which caused the largest correction in prior neutron experiments using material bottles. However, the neutron dynamics in field traps differ qualitatively from those in material bottles. In the latter case, neutrons bounce off material surfaces with significant diffusivity and the population quickly reach...
Source
#1B. PlasterH-Index: 5
#2Evan AdamekH-Index: 4
Last.B. A. ZeckH-Index: 7
view all 94 authors...
The UCNA experiment was designed to measure the neutron \betaasymmetry parameter A_0using polarized ultracold neutrons (UCN). UCN produced via downscattering in solid deuterium were polarized via transport through a 7 T magnetic field, and then directed to a 1 T solenoidal electron spectrometer, where the decay electrons were detected in electron detector packages located on the two ends of the spectrometer. A value for A_0was then extracted from the asymmetry in the numbers of counts i...
#1B. PlasterH-Index: 13
#2Evan AdamekH-Index: 4
Last.T. J. BowlesH-Index: 28
view all 94 authors...
Source
#1Nathan CallahanH-Index: 5
#2Chen-Yu LiuH-Index: 3
Last.B. A. ZeckH-Index: 7
view all 40 authors...
In the UCN{\tau} experiment, ultracold neutrons (UCN) are confined by magnetic fields and the Earth's gravitational field. Field-trapping mitigates the problem of UCN loss on material surfaces, which caused the largest correction in prior neutron experiments using material bottles. However, the neutron dynamics in field traps differ qualitatively from those in material bottles. In the latter case, neutrons bounce off material surfaces with significant diffusivity and the population quickly reach...
#1X. SunH-Index: 1
#2Evan AdamekH-Index: 4
Last.B. A. ZeckH-Index: 7
view all 60 authors...
It has been proposed recently that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in experiments that use two different measurement techniques. One of the possible final states discussed includes a single χ along with an e^+e^− pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with ∼4π acceptance us...
7 CitationsSource
#1Takeyasu M. ItoH-Index: 19
#2Evan AdamekH-Index: 4
Last.Albert YoungH-Index: 24
view all 26 authors...
The ultracold neutron (UCN) source at Los Alamos National Laboratory (LANL), which uses solid deuterium as the UCN converter and is driven by accelerator spallation neutrons, has been successfully operated for over 10 years, providing UCN to various experiments, as the first production UCN source based on the superthermal process. It has recently undergone a major upgrade. This paper describes the design and performance of the upgraded LANL UCN source. Measurements of the cold neutron spectrum a...
5 CitationsSource
#1Nathan CallahanH-Index: 5
#2Chen-Yu LiuH-Index: 3
Last.B. A. ZeckH-Index: 7
view all 40 authors...
Source
#1Robert W. Pattie (LANL: Los Alamos National Laboratory)H-Index: 12
#2Evan Adamek (IU: Indiana University Bloomington)H-Index: 4
Last.B. A. Zeck (NCSU: North Carolina State University)H-Index: 7
view all 27 authors...
Abstract We report on the evaluation of commercial electroless nickel phosphorus (NiP) coatings for ultracold neutron (UCN) transport and storage. The material potential of 50 μ m thick NiP coatings on stainless steel and aluminum substrates was measured to be V F = 213 ( 5 . 2 ) neV using the time-of-flight spectrometer ASTERIX at the Lujan Center. The loss per bounce probability was measured in pinhole bottling experiments carried out at ultracold neutron sources at Los Alamos Neutron Science ...
3 CitationsSource
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