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107 results on '"Morris C.L."'

1. Search for neutron dark decay: n → χ + e+e−

Author

Sun X., Adamek E., Allgeier B., Blatnik M., Bowles T.J., Broussard L.J., Brown M.A.-P., Carr R., Clayton S., Cude-Woods C., Currie S., Dees E.B., Ding X., Filippone B.W., García A., Geltenbort P., Hasan S., Hickerson K.P., Hoagland J., Hong R., Hogan G.E., Holley A.T., Ito T.M., Kneckt A., Liu C.-Y., Liu J., Makela M., Mammei R., Martin J.W., Melconian D., Mendenhall M.P., Moore S.D., Morris C.L., Nepal S., Nouri N., Pattie R.W., Galván A.P., Phillips II D.G., Picker R., Pitt M.L., Plaster B., Ramsey J.C., Rios R., Salvat D.J., Saunders A., Sondheim W., Sjue S., Slutsky S., Swank C., Swift G., Tatar E., Vogelaar R.B., VornDick B., Wanchun W., Wang Z., Wexler J., Womack T., Wrede C., Young A.R., and Zeck B.A.

Subjects
Physics, QC1-999
Abstract

In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. 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 using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). We use the timing information of coincidence events to select candidate dark sector particle decays by applying a timing calibration and selecting events within a physically-forbidden timing region for conventional n → p + e- + ν̅e decays. The summed kinetic energy (Ee+e−) from such events is reconstructed and used to set limits, as a function of the χ mass, on the branching fraction for this decay channel.

Published
2019
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2. Final results for the neutron β-asymmetry parameter A0 from the UCNA experiment

Author

Plaster B., Adamek E., Allgeier B., Anaya J., Back H.O., Bagdasarova Y., Berguno D.B., Blatnik M., Boissevain J.G., Bowles T.J., Broussard L.J., Brown M.A.-P., Carr R., Clark D.J., Clayton S., Cude-Woods C., Currie S., Dees E.B., Ding X., Du S., Filippone B.W., García A., Geltenbort P., Hasan S., Hawari A., Hickerson K.P., Hill R., Hino M., Hoagland J., Hoedl S.A., Hogan G.E., Hona B., Hong R., Holley A.T., Ito T.M., Kawai T., Kirch K., Kitagaki S., Knecht A., Lamoreaux S.K., Liu C.-Y., Liu J., Makela M., Mammei R.R., Martin J.W., Meier N., Melconian D., Mendenhall M.P., Moore S.D., Morris C.L., Mortensen R., Nepal S., Nouri N., Pattie R.W., Pérez Galván A., Phillips II D.G., Pichlmaier A., Picker R., Pitt M.L., Ramsey J.C., Rios R., Russell R., Sabourov K., Sallaska A.L., Salvat D.J., Saunders A., Schmid R., Seestrom S.J., Servicky C., Sharapov E.I., Sjue S.K.L., Slutsky S., Smith D., Sondheim W.E., Sun X., Swank C., Swift G., Tatar E., Teasdale W., Terai C., Tipton B., Utsuro M., Vogelaar R.B., VornDick B., Wang Z., Wehring B., Wexler J., Womack T., Wrede C., Xu Y.P., Yan H., Young A.R., Yuan J., and Zeck B.A.

Subjects
Physics, QC1-999
Abstract

The UCNA experiment was designed to measure the neutron β-asymmetry parameter A0 using 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 A0 was then extracted from the asymmetry in the numbers of counts in the two detector packages. We summarize all of the results from the UCNA experiment, obtained during run periods in 2007, 2008–2009, 2010, and 2011–2013, which ultimately culminated in a 0.67% precision result for A0.

Published
2019
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3. Status of the UCNτ experiment

Author

Pattie R.W., Callahan N.B., Cude-Woods C., Adamek E.R., Adams M., Barlow D., Blatnik M., D. Bowman, Broussard L.J., Clayton S., Currie S., Dees E.B., Ding X., Fellers D., Fox W., Fries E., Gonzalez F., Geltenbort P., Hickerson K.P., Hoffbauer M.A., Hoffman K., Holley A.T., Howard D., Ito T.M., Komives A., Liu C.Y., M. Makela, Medina J., Morley D., Morris C.L., O'Connor T., Penttilä S.I., Ramsey J.C., Roberts A., Salvat D., Saunders A., Seestrom S.J., Sharapov E.I., Sjue S.K.L., Snow W.M., Sprow A., Vanderwerp J., Vogelaar B., P.L. Walstrom, Wang Z., Weaver H., Wexler J., Womack T.L., Young A.R., and Zeck B.A.

Subjects
Physics, QC1-999
Abstract

The neutron is the simplest nuclear system that can be used to probe the structure of the weak interaction and search for physics beyond the standard model. Measurements of neutron lifetime and β-decay correlation coefficients with precisions of 0.02% and 0.1%, respectively, would allow for stringent constraints on new physics. The UCNτ experiment uses an asymmetric magneto-gravitational UCN trap with in situ counting of surviving neutrons to measure the neutron lifetime, τn = 877.7s (0.7s)stat (+0.4/−0.2s)sys. We discuss the recent result from UCNτ, the status of ongoing data collection and analysis, and the path toward a 0.25 s measurement of the neutron lifetime with UCNτ.

Published
2019
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5. Demonstration of sub-micron UCN position resolution using room-temperature CMOS sensor

Author

Lin, S., Baldwin, J.K., Blatnik, M., Clayton, S.M., Cude-Woods, C., Currie, S.A., Filippone, B., Fries, E.M., Geltenbort, P., Holley, A.T., Li, W., Liu, C.-Y., Makela, M., Morris, C.L., Musedinovic, R., O’Shaughnessy, C., Pattie, R.W., Jr., Salvat, D.J., Saunders, A., Sharapov, E.I., Singh, M., Sun, X., Tang, Z., Uhrich, W., Wei, W., Wolfe, B., Young, A.R., and Wang, Z.

Published
2023
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7. Characterization of electroless nickel-phosphorus plating for ultracold-neutron storage

Author

Akatsuka, H., Andalib, T., Bell, B., Berean-Dutcher, J., Bernier, N., Bidinosti, C.P., Cude-Woods, C., Currie, S.A., Davis, C.A., Franke, B., Gaur, R., Giampa, P., Hansen-Romu, S., Hassan, M.T., Hatanaka, K., Higuchi, T., Gibson, C., Ichikawa, G., Ide, I., Imajo, S., Ito, T.M., Jamieson, B., Kawasaki, S., Kitaguchi, M., Klassen, W., Korkmaz, E., Kuchler, F., Lang, M., Lavvaf, M., Lindner, T., Makela, M., Mammei, J., Mammei, R., Martin, J.W., Matsumiya, R., Miller, E., Mishima, K., Momose, T., Morawetz, S., Morris, C.L., Ong, H.J., O’Shaughnessy, C.M., Pereira-Wilson, M., Picker, R., Piermaier, F., Pierre, E., Schreyer, W., Sidhu, S., Stang, D., Tiepo, V., Vanbergen, S., Wang, R., Wong, D., and Yamamoto, N.

Published
2023
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8. Projection imaging with ultracold neutrons

Author

Kuk, K., Cude-Woods, C., Chavez, C.R., Choi, J.H., Estrada, J., Hoffbauer, M., Holland, S.E., Makela, M., Morris, C.L., Ramberg, E., Adamek, E.R., Bailey, T., Blatnik, M., Broussard, L.J., Brown, M.A.-P., Callahan, N.B., Clayton, S.M., Currie, S., Filippone, B.W., Fries, E.M., Geltenbort, P., Gonzalez, F., Hassan, M.T., Hayen, L., Hickerson, K.P., Holley, A.T., Ito, T.M., Liu, C.-Y., Merkel, P., Musedinovic, R., O’Shaughnessy, C., Pattie, R.W., Jr., Plaster, B., Salvat, D.J., Saunders, A., Sharapov, E.I., Sun, X., Tang, Z., Wei, W., Wexler, J.W., Young, A.R., and Wang, Zhehui

Published
2021
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9. Evaluation of commercial nickel–phosphorus coating for ultracold neutron guides using a pinhole bottling method

Author

Pattie, R.W., Jr, Adamek, E.R., Brenner, T., Brandt, A., Broussard, L.J., Callahan, N.B., Clayton, S.M., Cude-Woods, C., Currie, S.A., Geltenbort, P., Ito, T.M., Lauer, T., Liu, C.Y., Majewski, J., Makela, M., Masuda, Y., Morris, C.L., Ramsey, J.C., Salvat, D.J., Saunders, A., Schroffenegger, J., Tang, Z., Wei, W., Wang, Z., Watkins, E., Young, A.R., and Zeck, B.A.

Published
2017
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10. Detection system for neutron β decay correlations in the UCNB and Nab experiments

Author

Broussard, L.J., Zeck, B.A., Adamek, E.R., Baeßler, S., Birge, N., Blatnik, M., Bowman, J.D., Brandt, A.E., Brown, M., Burkhart, J., Callahan, N.B., Clayton, S.M., Crawford, C., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Fomin, N., Frlez, E., Fry, J., Gray, F.E., Hasan, S., Hickerson, K.P., Hoagland, J., Holley, A.T., Ito, T.M., Klein, A., Li, H., Liu, C.-Y., Makela, M.F., McGaughey, P.L., Mirabal-Martinez, J., Morris, C.L., Ortiz, J.D., Pattie, R.W., Jr., Penttilä, S.I., Plaster, B., Počanić, D., Ramsey, J.C., Salas-Bacci, A., Salvat, D.J., Saunders, A., Seestrom, S.J., Sjue, S.K.L., Sprow, A.P., Tang, Z., Vogelaar, R.B., Vorndick, B., Wang, Z., Wei, W., Wexler, J., Wilburn, W.S., Womack, T.L., and Young, A.R.

Published
2017
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12. Position-sensitive detection of ultracold neutrons with an imaging camera and its implications to spectroscopy

Author

Wei, Wanchun, Broussard, L.J., Hoffbauer, M.A., Makela, M., Morris, C.L., Tang, Z., Adamek, E.R., Callahan, N.B., Clayton, S.M., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Geltenbort, P., Hickerson, K.P., Holley, A.T., Ito, T.M., Leung, K.K., Liu, C.-Y., Morley, D.J., Ortiz, Jose D., Pattie, R.W., Jr., Ramsey, J.C., Saunders, A., Seestrom, S.J., Sharapov, E.I., Sjue, S.K., Wexler, J., Womack, T.L., Young, A.R., Zeck, B.A., and Wang, Zhehui

Published
2016
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14. A multilayer surface detector for ultracold neutrons

Author

Wang, Zhehui, Hoffbauer, M.A., Morris, C.L., Callahan, N.B., Adamek, E.R., Bacon, J.D., Blatnik, M., Brandt, A.E., Broussard, L.J., Clayton, S.M., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Gao, J., Gray, F.E., Hickerson, K.P., Holley, A.T., Ito, T.M., Liu, C.-Y., Makela, M., Ramsey, J.C., Pattie, R.W., Jr., Salvat, D.J., Saunders, A., Schmidt, D.W., Schulze, R.K., Seestrom, S.J., Sharapov, E.I., Sprow, A., Tang, Z., Wei, W., Wexler, J., Womack, T.L., Young, A.R., and Zeck, B.A.

Published
2015
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19. Sealed drift tube cosmic ray veto counters

Author

Rios, R., Tatar, E., Bacon, J.D., Bowles, T.J., Hill, R., Green, J.A., Hogan, G.E., Ito, T.M., Makela, M., Morris, C.L., Mortenson, R., Pasukanics, F.E., Ramsey, J., Saunders, A., Seestrom, S.J., Sondheim, W.E., Teasdale, W., Saltus, M., Back, H.O., Cottrell, C.R., Holley, A.T., Pattie, R.W., Jr., Young, A.R., Broussard, L.J., Filippone, B.W., Hickerson, K.P., Liu, J., Mendenhall, M.P., Plaster, B., Mammei, R.R., Pitt, M.L., Vogelaar, R.B., and Martin, J.W.

Published
2011
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20. Investigation of solid [formula omitted], [formula omitted] and [formula omitted] for ultracold neutron production

Author

Atchison, F., Blau, B., Bodek, K., van den Brandt, B., Bryś, T., Daum, M., Fierlinger, P., Frei, A., Geltenbort, P., Hautle, P., Henneck, R., Heule, S., Holley, A., Kasprzak, M., Kirch, K., Knecht, A., Konter, J.A., Kuźniak, M., Liu, C.-Y., Morris, C.L., Pichlmaier, A., Plonka, C., Pokotilovski, Y., Saunders, A., Shin, Y., Tortorella, D., Wohlmuther, M., Young, A.R., Zejma, J., and Zsigmond, G.

Published
2009
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21. Multi-wire proportional chamber for ultra-cold neutron detection

Author

Morris, C.L., Bowles, T.J., Gonzales, J., Hill, R., Hogan, G., Makela, M., Mortenson, R., Ramsey, J., Saunders, A., Seestrom, S.J., Sondheim, W.E., Teasdale, W., Back, H.O., Pattie, R.W., Jr., Holley, A.T., Young, A.R., Broussard, L.J., Hickerson, K.P., Liu, J., Mendenhall, M.P., Plaster, B., Mammei, R.R., Pitt, M., Vogelaar, R.B., Rios, R., and Martin, J.

Published
2009
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22. Exploring signatures of different physical processes for fusion with scattering muon tomography

Author

Klimenko, A.V., Priedhorsky, W.C., Borozdin, K.N., Morris, C.L., Schultz, L.J., and Green, A.J.

Subjects
Tomography -- Research, Attenuation -- Research, Cosmic rays -- Research, Electromagnetic waves -- Scattering, Electromagnetic waves -- Research, Business, Electronics, Electronics and electrical industries
Abstract

The success of scattering muon tomography has prompted us to explore cosmic ray flux attenuation, electro-magnetic shower induction, and muouic X-ray emission as additional means for the non-destructive assay of small and medium size objects. We report on the value of the signatures of these processes as an adjunct to multiple scattering muon tomography. We discuss our experiments and the Monte-Carlo calculations of these processes, the type of information that can be drawn from their signatures, the cost and the value of this information. We discuss the general requirements for detector systems to make use of cosmic ray flux attenuation, induction of electro-magnetic showers, and muonic X-rays in muon tomography. We find that the attenuation of the cosmic ray flux allows for the inference of the density distribution for objects of automobile size and smaller with exposure times of order a few minutes. Our preliminary experiments and calculations have shown that using muonic X-rays to identify composition is exceedingly difficult, requiring months of exposure. Our experiments are not yet sensitive enough to detect muonic x-rays at the rates expected from previous accelerator experiments. Index Terms--Cosmic ray flux attenuation, electromagnetic showers, muon tomography, muonic x-rays.

Published
2007

23. Improved limits on Fierz Interference using asymmetry measurements from the UCNA experiment

Author

Sun, X., Adamek, E., Allgeier, B., Bagdasarova, Y., Berguno, D.B., Blatnik, M., Bowles, T.J., Broussard, L.J., Brown, M.A.-P., Carr, R., Clayton, S., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hasan, S., Hickerson, K.P., Hoagland, J., Hong, R., Holley, A.T., Ito, T.M., Knecht, A., Liu, C.-Y., Liu, J., Makela, M., Mammei, R., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, S.D., Morris, C.L., Nepal, S., Nouri, N., Pattie, R.W., Pérez Galván, A., Phillips, D.G., Picker, R., Pitt, M.L., Plaster, B., Salvat, D.J., Saunders, A., Sharapov, E.I., Sjue, S., Slutsky, S., Sondheim, W., Swank, C., Tatar, E., Vogelaar, R.B., Vorndick, B., Wang, Z., Wei, W., Wexler, J.W., Womack, T., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), ILL, and UCNA

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

The Ultracold Neutron Asymmetry (UCNA) experiment was designed to measure the $\beta$-decay asymmetry parameter, $A_0$, for free neutron decay. In the experiment, polarized ultracold neutrons are transported into a decay trap, and their $\beta$-decay electrons are detected with $\approx 4\pi$ acceptance into two detector packages which provide position and energy reconstruction. The experiment also has sensitivity to $b_{n}$, the Fierz interference term in the neutron $\beta$-decay rate. In this work, we determine $b_{n}$ from the energy dependence of $A_0$ using the data taken during the UCNA 2011-2013 run. In addition, we present the same type of analysis using the earlier 2010 $A$ dataset. Motivated by improved statistics and comparable systematic errors compared to the 2010 data-taking run, we present a new $b_{n}$ measurement using the weighted average of our asymmetry dataset fits, to obtain $b_{n} = 0.066 \pm 0.041_{\text{stat}} \pm 0.024_{\text{syst}}$ which corresponds to a limit of $-0.012 < b_{n} < 0.144$ at the 90% confidence level., Comment: 6 pages, 3 figures. Submission to PRC

Published
2019

26. Search for neutron dark decay: n $\rightarrow \chi + e^+e^-$

Author

Sun, X., Adamek, E., Allgeier, B., Blatnik, M., Bowles, T.J., Broussard, L.J., Brown, M.A.P., Carr, R., Clayton, S., Cude-Woods, C., Currie, S., Dees, E.B., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hasan, S., Hickerson, K.P., Hoagland, J., Hong, R., Hogan, G.E., Holley, A.T., Ito, T.M., Kneckt, A., Liu, C.Y., Liu, J., Makela, M., Mammei, R., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, S.D., Morris, C.L., Nepal, S., Nouri, N., Pattie, R.W., Galván, A.P., II, D.G.Phillips, Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Salvat, D.J., Saunders, A., Sondheim, W., Sjue, S., Slutsky, S., Swank, C., Swift, G., Tatar, E., Vogelaar, R.B., Vorndick, B., Wanchun, W., Wang, Z., Wexler, J., Womack, T., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), and ILL

Subjects
energy: kinetic, branching ratio: upper limit, n: decay, n: branching ratio, talk: Grenoble 2018/05/24, calibration, dark matter, mass dependence, electron: pair production, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, n: lifetime, acceptance, experimental results
Abstract

International audience; In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. 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 using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). We use the timing information of coincidence events to select candidate dark sector particle decays by applying a timing calibration and selecting events within a physically-forbidden timing region for conventional n → p + e- + ν̅e decays. The summed kinetic energy (Ee+e−) from such events is reconstructed and used to set limits, as a function of the χ mass, on the branching fraction for this decay channel.

Published
2018
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27. The construction and operating characteristics of a cathode strip chamber system designed to measure the reaction vertices of a stopping kaon beam

Author

Ahmed, M.W., Androic, D., Bertovic, I., Bjoraker, J., Chrien, R., Cui, X., Dehnhard, D., Empl, A., Furic, M., Gerald, J., Gill, R., Hungerford, E.V., Juengst, H., Lan, K.J., Liu, J.H., Morris, C.L., O'Donnell, J.M., Peng, J.C., Petkovic, T., Pile, P., Planinic, M., Riedel, C.M., Rusek, A., Sutter, R., Tang, L., Thiessen, H.A., Youn, M., and Zeps, V.

Published
2001
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28. Search for the Neutron Decay n$\rightarrow$ X+$\gamma$ where X is a dark matter particle

Author

Tang, Z., Blatnik, M., Broussard, L.J., Choi, J.H., Clayton, S.M., Cude-Woods, C., Currie, S., Fellers, D.E., Fries, E.M., Geltenbort, P., Gonzalez, F., Ito, T.M., Liu, C.Y., MacDonald, S.W.T., Makela, M., Morris, C.L., O'Shaughnessy, C.M., Pattie, R.W., Plaster, B., Salvat, D.J., Saunders, A., Wang, Z., Young, A.R., Zeck, B.A., Institut Laue-Langevin ( ILL ), ILL, and Institut Laue-Langevin (ILL)

Subjects
Automatic Keywords, gamma ray, dark matter: decay modes, n: decay, High Energy Physics::Experiment, n: lifetime, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

In a recent paper submitted to Physical Review Letters, Fornal and Grinstein have suggested that the discrepancy between two different methods of neutron lifetime measurements, the beam and bottle methods can be explained by a previously unobserved dark matter decay mode, n$\rightarrow$ X+$\gamma$ where X is a dark matter particle. We have performed a search for this decay mode over the allowed range of energies of the monoenergetic gamma ray for X to be a dark matter particle. We exclude the possibility of a sufficiently strong branch to explain the lifetime discrepancy with greater than 4 sigma confidence., Comment: 6 pages 3 figures

Published
2018
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29. New result for the neutron $\beta$-asymmetry parameter $A_0$ from UCNA

Author

Brown, M.A.-P., Dees, E.B., Adamek, E., Allgeier, B., Blatnik, M., Bowles, T.J., Broussard, L.J., Carr, R., Clayton, S., Cude-Woods, C., Currie, S., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hasan, S., Hickerson, K.P., Hoagland, J., Hong, R., Hogan, G.E., Holley, A.T., Ito, T.M., Knecht, A., Liu, C.-Y., Liu, J., Makela, M., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, S.D., Morris, C.L., Nepal, S., Nouri, N., Pattie, R.W., Pérez Galván, A., Phillips, D.G., Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Salvat, D.J., Saunders, A., Sondheim, W., Seestrom, S.J., Sjue, S., Slutsky, S., Sun, X., Swank, C., Swift, G., Tatar, E., Vogelaar, R.B., Vorndick, B., Wang, Z., Wexler, J., Womack, T., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), ILL, UCNA, and Institut Laue-Langevin ( ILL )

Subjects
electron, axial-vector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], weak coupling, Automatic Keywords, statistics, S017AV, correlation, High Energy Physics::Experiment, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, n: spin, S017BA, asymmetry, experimental results
Abstract

The neutron $\beta$-decay asymmetry parameter $A_0$ defines the correlation between the spin of the neutron and the momentum of the emitted electron, which determines $\lambda=\frac{g_{A}}{g_{V}}$, the ratio of the axial-vector to vector weak coupling constants. The UCNA Experiment, located at the Ultracold Neutron facility at the Los Alamos Neutron Science Center, is the first to measure such a correlation coefficient using ultracold neutrons (UCN). Following improvements to the systematic uncertainties and increased statistics, we report the new result $A_0 = -0.12054(44)_{\mathrm{stat}}(68)_{\mathrm{syst}}$ which yields $\lambda\equiv \frac{g_{A}}{g_{V}}=-1.2783(22)$. Combination with the previous UCNA result and accounting for correlated systematic uncertainties produces $A_0=-0.12015(34)_{\mathrm{stat}}(63)_{\mathrm{syst}}$ and $\lambda\equiv \frac{g_{A}}{g_{V}}=-1.2772(20)$., Comment: 9 pages, 7 figures, updated to as-published version

Published
2018
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30. Measurement of the parity violating asymmetry Aγ in [formula omitted]

Author

Snow, W.M, Bazhenov, A, Blessinger, C.S, Bowman, J.D, Chupp, T.E, Coulter, K.P, Freedman, S.J, Fujikawa, B.K, Gentile, T.R, Greene, G.L, Hansen, G, Hogan, G.E, Ishimoto, S, Jones, G.L, Knudson, J.N, Kolomenski, E, Lamoreaux, S.K, Leuschner, M.B, Masaike, A, Masuda, Y, Matsuda, Y, Morgan, G.L, Morimoto, K, Morris, C.L, Nann, H, Penttilä, S.I, Pirozhkov, A, Pomeroy, V.R, Rich, D.R, Serebrov, A, Sharapov, E.I, Smith, D.A, Smith, T.B, Welsh, R.C, Wietfeldt, F.E, Wilburn, W.S, Yuan, V.W, and Zerger, J

Published
2000
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32. An 800-MeV proton radiography facility for dynamic experiments

Author

King, N.S.P, Ables, E, Adams, Ken, Alrick, K.R, Amann, J.F, Balzar, Stephen, Barnes Jr, P.D, Crow, M.L, Cushing, S.B, Eddleman, J.C, Fife, T.T, Flores, Paul, Fujino, D, Gallegos, R.A, Gray, N.T, Hartouni, E.P, Hogan, G.E, Holmes, V.H, Jaramillo, S.A, Knudsson, J.N, London, R.K, Lopez, R.R, McDonald, T.E, McClelland, J.B, Merrill, F.E, Morley, K.B, Morris, C.L, Naivar, F.J, Parker, E.L, Park, H.S, Pazuchanics, P.D, Pillai, C, Riedel, C.M, Sarracino, J.S, Shelley Jr, F.E, Stacy, H.L, Takala, B.E, Thompson, Richard, Tucker, H.E, Yates, G.J, Ziock, H.-J, and Zumbro, J.D

Published
1999
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33. First direct constraints on Fierz interference in free neutron $\beta$ decay

Author

Hickerson, K.P., Sun, X., Bagdasarova, Y., Bravo-Berguño, D., Broussard, L.J., Brown, P., Carr, R., Currie, S., Ding, X., Filippone, B.W., GarcÍa, A., Geltenbort, P., Hoagland, J., Holley, A.T., Hong, R., Ito, T.M., Knecht, A., Liu, C.-Y, Liu, J.L., Makela, M., Mammei, R.R., Martin, J.W., Melconian, D., Mendenhall, M.P., Moore, § S.D., Morris, C.L., Pattie, R.W., Pérez Galván, A., Picker, R., Pitt, M.L., Plaster, B., Ramsey, J.C., Rios, R., Saunders, A., Seestrom, S.J., Sharapov, E.I., Sondheim, W.E., Tatar, E., Vogelaar, R.B., Vorndick, B., Wrede, C., Young, A.R., Zeck, B.A., Institut Laue-Langevin (ILL), ILL, and Institut Laue-Langevin ( ILL )

Subjects
Particle physics, scale: TeV, Astrophysics::High Energy Astrophysical Phenomena, interference, n: decay, Weak interaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Interference (wave propagation), 01 natural sciences, Standard Model, Nuclear physics, weak interaction, statistical analysis, 0103 physical sciences, Fierz-Pauli equation, Neutron, Tensor, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Nuclear Experiment, Monte Carlo, Physics, Spectrometer, 010308 nuclear & particles physics, precision measurement, new physics, n: decay rate, Electroweak interaction, semileptonic decay, coupling: tensor, Beta decay, High Energy Physics::Experiment, spectrometer, experimental results
Abstract

Precision measurements of free neutron $\beta$-decay have been used to precisely constrain our understanding of the weak interaction. However the neutron Fierz interference term $b_n$, which is particularly sensitive to Beyond-Standard-Model tensor currents at the TeV scale, has thus far eluded measurement. Here we report the first direct constraints on this term, finding $b_n = 0.067 \pm 0.005_{\text{stat}} {}^{+0.090}_{- 0.061}{}_{\text{sys}}$, consistent with the Standard Model. The uncertainty is dominated by absolute energy reconstruction and the linearity of the beta spectrometer energy response.

Published
2017
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34. Experimental study of the 12C(K-stopped, pi0)12Blambda reaction

Author

Ahmed, M.W., Cui, X., Empl, A., Hungerford, E.V., Lan, K.J., Youn, M, Chrien, R.E., Gill, R., Pile, P., Rusek, A., Sutter, R., Bjoraker, J., Dehnhard, D., O'Donell, J.M., Gerald, J., Liu, J.H., Peng, J.C., Morris, C.L., Riedel, C.M., Thiessen, H.A., Androić, Darko, Bertović, Igor, Furić, Miroslav, Petković, Tomislav, Planinić, Mirko, Tang, L., and Zeps, V.

Subjects
nuclei with mass number 6 to 19, kaon-nucleus reactions, pion production, hypernuclei
Abstract

The (K-stopped, pi0) strangeness and charge changing reaction was investigated by producing a 12Blambda hypernucleus from a carbon target. The branching ratio for K- capture to the ground and p-shell states of this hypernucleus was found to be (0.28 +- 0.08)x10-3 and (0.35 +- 0.09)x10-3, respectively, which after correction for isospin was lower than a previously measured value for the 12C(K-stopped, pi-)12Clambda reaction, but still above the theoretical predictions for the ground state. The experiment obtained a missing-mass resolution comparable to in-flight reactions, however the higher background and lower selectivity of the K-stopped reaction limits its usefulness in experimental study of the 12C(K-stopped, pi0)12Blambda reaction.

Published
2003

35. Inexpensive and practical sealed drift-tube neutron detector

Author

Wang, Zhehui, Morris, C.L., Makela, M.F., Bacon, J.D., Baer, E.E., Brockwell, M.I., Brooks, B.J., Clark, D.J., Green, J.A., Greene, S.J., Hogan, G.E., Langan, R., Murray, M.M., Pazuchanics, F.E., Phelps, M.P., Ramsey, J.C., Reimus, N.P., Roybal, J.D., Saltus, A., Saltus, M., Shimada, R., Spaulding, R.J., Wood, J.G., and Wysocki, F.J.

Published
2009
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36. Analyzing powers for the pi^-pvector to pi^o n reaction across the Delta (1232) resonance

Author

Gaulard, C.V., Riedel, C.M., Comfort, J.R., Amann, J.F., Beddo, M.E., Boudrie, R.L., Burleson, Cole, P.L., Craig, K.K., Espy, M.A., Isenhower, L.D., Kasprzyk, T.E., Knight, R.K., Morris, C.L., Penttilä, S., Rigsby, D., Sadler, M.E., Six, E., Spinka, H.M., Supek, Ivan, Wagner, G.J., and Zhao, Q.

Subjects
Nuclear Theory, analyzing powers, polarized proton, phase-shift analyses, Delta(1232) resonance, Nuclear Experiment
Abstract

High quality analyzing powers for the pi^-pvector to pi^0 n reaction have been obtained with a polarized proton target over a broad angular range at incident kinetic energies of 98.1, 138.8, 165.9, and 214.4 MeV. This experiment nearly doubled the existing N single-charge-exchange database for energies ranging from 10 to 230 MeV, with 36 new analyzing powers. The Neutral Meson Spectrometer was used to detect the outgoing neutral pions. The data are well described by recent phase-shift analyses. When combined with high-precision and accurate cross section data at the same energies, the data can provide a good test of the degree of isospin breaking in the region of the Delta (1232) resonance. They will also be helpful for constraining the evaluation of the pion-nucleon term from the scattering amplitudes.

Published
1999
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37. Exclusive Compton Scattering on the Proton

Author

Chen, J.P., Chudakov, E., DeJager, C., Degtyarenko, P., Ent, R., Gomez, J., Hansen, O., Keppel, C., Klein, F., Kuss, M., LeRose, J., Liang, M., Michaels, R., Mitchell, J., Liyanage, N., Rutt, P., Saha, A., Wojtsekhowski, B., Bouwhuis, M., Chang, T.H., Holt, R.J., Nathan, A.M., Roedelbronn, M., Wijesooriya, K., Williamson, S.E., Dodge, G., Hyde-Wright, C., Radyushkin, A., Sabatie, F., Weinstein, L.B., Ulmer, P., Bosted, P.E., Finn, J.M., Jones, M., Churchwell, S., Howell, C., Gilman, R., Glashausser, C., Jiang, X., Ransome, R., Strauch, S., Berthot, J., Bertin, P.Y., Fonvieille, H., Roblin, Y., Bertozzi, W., Gilad, S., Rowntree, D., Zu, Z., Brown, D., Chang, G., Afanasev, A., Egiyan, K., Hoohauneysan, E., Ketikyan, A., Petrosyan, Artem, Shahinyan, A., Voskanyan, H., Boeglin, W., Markowitz, P., Hines, J., Strobel, G., Templon, J., Feldman, G., Morris, C.L., Gladyshev, V., Lindgren, R.A., Calarco, J., Hersman, W., Leuschner, M., Gasparian, A., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and HALL A

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

38. Measurement of Asymetries of Pion Single Charge Exchange on Polarized 3^He at 200 MeV

Author

Zhao, Q., Burleson, G.R., Blanchard, G.R., Chang, S., Gibbs, T.H., Park, W., Espz, B.K., Dehnhard, M.A., Larson, D.K., O'Donnell, B.C., Palarczyk, J.M., Cummings, M., Hausser, W., Pasyuk, O.F., Amann, J.F., Boudrie, R.L., Riedel, R.L., Morris, C.L., Penttila, S., Comfort, J.R., Gaulard, C.V., Glass, G., and Supek, Ivan

Subjects
Physics::Instrumentation and Detectors, Nuclear Theory, Nuclear Experiment
Abstract

Asymmetries for the (–,0) reaction on polarized 3He were measured using a 200-MeV pion beam at LAMPF. The 0's were detected with the neutral meson spectrometer in coincidence with the recoiling tritons. A recoil triton detector, consisting of scintillation-counter telescopes and a wire chamber, was used to measure the time-of-flight, energy loss, and direction of the tritons. The polarized gaseous 3He target, developed at TRIUMF, was modified to run with two diode lasers; the polarization reached 65%. The asymmetries between lab = 60° and 105° were found to be strongly angle dependent. The results are compared with theoretical calculations.

Published
1999

39. Analyzing powers for the Pi- P(Polarized) -> Pio N Reaction across the Delta (1232) Resonance

Author

Gaulard, C.V., Comfort, C.J.R., Craig, K.K., Six, E., Amann, J.F., Boudrie, R.L., Morris, C.L., Penttila, S., Riedl, C.M., Beddo, M.E., Burleson, G.R., Zhao, Q., Isenhower, L.D., Knight, K.R., Rigsby, D., Sadler, M.E., Kasprzyk, T.E., Spinka, H.M., Cole, P.L., Espy, M.A., Supek, Ivan, and Wagner, G.J.

Subjects
Analyzing power, Delta resonance, LAMP experiment 1178
Abstract

In the LAMPF experiment Pi- P(Polarized) -> Pio N reaction have been obtained over a broad angular range at incident kinetic energies of 98.1, 138.8, 165.9 and 214.4 MeV. High quality data for this change-exchange reaction are sparse. Analyzing-power measurements for the PiN system are particularly sensitive to the interference between partial waves, and can provide crucial information for partial-wave decompositions of the PiN amplitudes. These measurements will help to quantify topics such as the violation of isospin invariance in the PiN system across the Delta(1232) resonance and the negative-energy extrapolation of the PiN amplitudes for extraction of the PiN sigma term.

Published
1997

40. 3He and 4He production by 800 MeV protons from 12C, Ti, and Pb at forward angles

Author

Barlow, D.B., Nefkens, B.M.K., Pillai, C., Price, J.W., Šlaus, Ivo, Wang, M.J., Wightman, J.A., Jones, K.W., Leitch, M.J., Mishra, C.S., Morris, C.L., Peng, J-C., Teng, P.K., and Tinsley, J.M.

Subjects
Nuclear Theory, Nuclear Experiment, 3He production cross section, nucleon-nucleon scattering
Abstract

The doubly differential cross section for the production of 3He and 4He by 800 MeV protons from 12C, Ti, and Pb has been measured at laboratory angles of 6° and 15°. The momentum of the detected helium nuclei varied from 1 to 2 GeV/c, the maximum being well above the incident proton momentum of 1.46 GeV/c. The cross sections were found to increase with increasing target mass and decrease with increasing momentum and scattering angle. In our momentum region, the 3He production cross section is 1.5– 10 times larger than 4He depending on the target and the momentum. The data are consistent with the hypothesis that the dominant reaction mechanism is a direct process where the initial nucleon-nucleon scattering is followed by a sequential pickup of neutrons.

Published
1992
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41. Search for Neutral Pions from the Spontaneous Fission of 252Cf

Author

Knudson, J.N., Morris, C.L., Bowman, J.D., Sailor, W.C., Seestrom, S.J., Supek, Ivan, Sadler, M.E., and Isenhower, D.I.

Subjects
spontaneous fission
Abstract

A search for Pi^0's arising from the spontaneous fission of 252Cf using the LAMPF Pi^0 spectrometer has yielded no evidence for this process. We obtain an upper limit of 1.4x10^11 with a 90% confidence level for the branching ratio of Pi^0's produced at rest in the spontaneous fission of 252Cf.

Published
1991

43. Determination of the Gamow-Teller Quenching Factor via the90Zr(n, p) Reaction at 293 MeV.

Author

Yako, K., Sakai, H., Greenfield, M.B., Hatanaka, K., Hatano, M., Kamiya, J., Kitamura, Y., Maeda, Y., Morris, C.L., Okamura, H., Rapaport, J., Saito, T., Sakemi, Y., Sekiguchi, K., Shimizu, Y., Suda, K., Tamii, A., Uchigashima, N., and Wakasa, T.

Subjects
RESONANCE, ISOBARIC spin
Abstract

The double differential cross sections at 0°–12° were measured for the 90Zr(n,p) reaction at 293 MeV in a wide excitation energy region of 0–70 MeV. The experiment was performed by using the (n,p) facility at the Research Center for Nuclear Physics. The multipole decomposition (MD) technique was applied to the measured cross sections to extract the GT component in the continuum. After subtracting the contribution of the isovector spin-monopole excitation we obtained the GT strength of Sβ+ = 3.0 ± 0.3 ± 0.8 ± 0.5 up to 31.4 MeV excitation. The quenching factor Q was deduced by using the present result and the Sβ- value obtained from the MD analysis of the 90Zr(p,n) spectra. The result is Q = 0.83 ± 0.06 in regards to Ikeda’s sum rule value of 3(N - Z) = 30. © 2003 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2003
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44. Tomographic Imaging with Cosmic Ray Muons.

Author

MORRIS, C.L., ALEXANDER, C.C., BACON, J.D., BOROZDIN, K.N., CLARK, D.J., CHARTRAND, R., ESPINOZA, C.J., FRASER, A.M., GALASSI, M.C., GREEN, J.A., GONZALES, J.S., GOMEZ, J.J., HENGARTNER, N.W., HOGAN, G.E., KLIMENKO, A.V., MAKELA, M.F., McGAUGHEY, P., MEDINA, J.J., PAZUCHANICS, F.E., and PRIEDHORSKY, W.C.

Subjects
TOMOGRAPHY, POSITRON emission tomography, DETECTORS, MACHINE design, REMOTE sensing, VEHICLE detectors, NUCLEAR counters
Abstract

Over 120 million vehicles enter the United States each year. Many are capable of transporting hidden nuclear weapons or nuclear material. Currently deployed X-ray radiography systems are limited because they cannot be used on occupied vehicles and the energy and dose are too low to penetrate many cargos. We present a new technique that overcomes these limitations by obtaining tomographic images using the multiple scattering of cosmic radiation as it transits each vehicle. When coupled with passive radiation detection, muon interrogation could contribute to safe and robust border protection against nuclear devices or material in occupied vehicles and containers. [ABSTRACT FROM AUTHOR]

Published
2008
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47. Development of Multiframe Detectors for Ultrafast Radiography With 800 MeV Protons.

Author

Kwiatkowski, K., Beche, J.-F., Burks, M.T., Hart, G., Hogan, G.E., Manfredi, P.F., Millaud, J.E., Morris, C.L., King, N.S.P., Pazuchanics, P.D., and Turko, B.

Subjects
IMAGE analysis, PROTON beams, RADIOGRAPHY
Abstract

Presents information on a study that constructed two pixelated detectors which can record signals produced by 800-megaelectronvolts proton beam micropulses with a repetition rate of 358 nanoseconds. Advantage of proton radiography; Performance goals for the imaging detector; Discussion on the photo diode array approach.

Published
2002
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