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25 results on '"Marek, L. J."'

1. Analysis of large-scale anisotropy of ultra-high energy cosmic rays in HiRes data

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Hüntemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Koers, H., Loh, E. C., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tinyakov, P., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Stereo data collected by the HiRes experiment over a six year period are examined for large-scale anisotropy related to the inhomogeneous distribution of matter in the nearby Universe. We consider the generic case of small cosmic-ray deflections and a large number of sources tracing the matter distribution. In this matter tracer model the expected cosmic ray flux depends essentially on a single free parameter, the typical deflection angle theta. We find that the HiRes data with threshold energies of 40 EeV and 57 EeV are incompatible with the matter tracer model at a 95% confidence level unless theta is larger than 10 degrees and are compatible with an isotropic flux. The data set above 10 EeV is compatible with both the matter tracer model and an isotropic flux., Comment: 9 pages, 5 Postscript figures

Published
2010
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2. Indications of Proton-Dominated Cosmic Ray Composition above 1.6 EeV

Author

Abbasi, R. U., Abu-Zayyad, T., Al-Seady, M., Allen, M., Amman, J. F., Anderson, R. J., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huentemeyer, P., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Loh, E. C., Lundquist, J. P., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M., Rodriguez, D., Sasaki, N., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S., Thomas, S. B., Thomas, J. R., Thomson, G. B., Tupa, D., Zhang, X., and Zech, A.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

We report studies of ultra-high energy cosmic ray composition via analysis of depth of airshower maximum (Xmax), for airshower events collected by the High Resolution Fly's Eye (HiRes) observatory. The HiRes data are consistent with a constant elongation rate d/d(log(E)) of 47.9 +- 6.0 (stat.) +- 3.2 (syst.)g/cm^2/decade for energies between 1.6 EeV and 63 EeV, and are consistent with a predominantly protonic composition of cosmic rays when interpreted via the QGSJET01 and QGSJET-II high-energy hadronic interaction models. These measurements constrain models in which the galactic-to-extragalactic transition is the cause of the energy spectrum "ankle' at 4 EeV., Comment: 11 pages, 4 figures, accepted for publication in Physical Review Letters

Published
2009
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3. Measurement of the Flux of Ultra High Energy Cosmic Rays by the Stereo Technique

Author

Abbasi, R. U., Abu-Zayyad, T., Al-Seady, M., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Bergman, D. R., Blake, S. A., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huntemeyer, P., Ivanov, D., Jones, B. F., Jui, C. C. H., Kim, K., Kirn, M. A., Loh, E. C., Maestas, M. M., Manago, N., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neil, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., Zhang, B. K., Zhang, X., and Zhang, Y.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Extragalactic Astrophysics
Abstract

The High Resolution Fly's Eye experiment has measured the flux of ultrahigh energy cosmic rays using the stereoscopic air fluorescence technique. The HiRes experiment consists of two detectors that observe cosmic ray showers via the fluorescence light they emit. HiRes data can be analyzed in monocular mode, where each detector is treated separately, or in stereoscopic mode where they are considered together. Using the monocular mode the HiRes collaboration measured the cosmic ray spectrum and made the first observation of the Greisen-Zatsepin-Kuzmin cutoff. In this paper we present the cosmic ray spectrum measured by the stereoscopic technique. Good agreement is found with the monocular spectrum in all details., Comment: 20 pages, 10 figures

Published
2009
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4. Search for Correlations between HiRes Stereo Events and Active Galactic Nuclei

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amman, J. F., Archbold, G., Belov, K., Belz, J. W., BenZvi, S. Y., Bergman, D. R., Blake, S. A., Boyer, J. H., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huntemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Knapp, B. C., Loh, E. C., Maestas, M. M., Manago, N., Mannel, E. J., Marek, L. J., Martens, K., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Sasaki, D. Rodriguez N., Schnetzer, S. R., Scott, L. M., Seman, M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics
Abstract

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays observed by the High Resolution Fly's Eye experiment and Active Galactic Nuclei (AGN) visible from its northern hemisphere location. No correlations, other than random correlations, have been found. We report our results using search parameters prescribed by the Pierre Auger collaboration. Using these parameters, the Auger collaboration concludes that a positive correlation exists for sources visible to their southern hemisphere location. We also describe results using two methods for determining the chance probability of correlations: one in which a hypothesis is formed from scanning one half of the data and tested on the second half, and another which involves a scan over the entire data set. The most significant correlation found occurred with a chance probability of 24%., Comment: 13 pages, 1 table, 5 figures

Published
2008
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5. An upper limit on the electron-neutrino flux from the HiRes detector

Author

Abbasi, R. U., Abu-Zayyad, T., Allen, M., Amann, J. F., Archbold, G., Belov, K., Belz, J. W., Zvi, S. Y. Ben, Bergman, D. R., Biesiadecka, A., Blake, S. A., Boyer, J. H., Brusova, O. A., Burt, G. W., Cannon, C., Cao, Z., Deng, W., Fedorova, Y., Findlay, J., Finley, C. B., Gray, R. C., Hanlon, W. F., Hoffman, C. M., Holzscheiter, M. H., Hughes, G., Huentemeyer, P., Ivanov, D., Jones, B. F, Jui, C. C. H., Kim, K., Kirn, M. A., Knapp, B. C., Loh, E. C., Maestas, M. M., Manago, N., Mannel, E. J., Marek, L. J., Martens, K., Matthews, J. A. J., Matthews, J. N., Moore, S. A., O'Neill, A., Painter, C. A., Perera, L., Reil, K., Riehle, R., Roberts, M. D., Rodriguez, D., Sasaki, M., Schnetzer, S. R., Scott, L. M., Seman, M., Sinnis, G., Smith, J. D., Snow, R., Sokolsky, P., Song, C., Springer, R. W., Stokes, B. T., Stratton, S. R., Thomas, J. R., Thomas, S. B., Thomson, G. B., Tupa, D., Wiencke, L. R., Zech, A., and Zhang, X.

Subjects
Astrophysics
Abstract

Air-fluorescence detectors such as the High Resolution Fly's Eye (HiRes) detector are very sensitive to upward-going, Earth-skimming ultrahigh energy electron-neutrino-induced showers. This is due to the relatively large interaction cross sections of these high-energy neutrinos and to the Landau-Pomeranchuk-Migdal (LPM) effect. The LPM effect causes a significant decrease in the cross sections for bremsstrahlung and pair production, allowing charged-current electron-neutrino-induced showers occurring deep in the Earth's crust to be detectable as they exit the Earth into the atmosphere. A search for upward-going neutrino-induced showers in the HiRes-II monocular dataset has yielded a null result. From an LPM calculation of the energy spectrum of charged particles as a function of primary energy and depth for electron-induced showers in rock, we calculate the shape of the resulting profile of these showers in air. We describe a full detector Monte Carlo simulation to determine the detector response to upward-going electron-neutrino-induced cascades and present an upper limit on the flux of electron-neutrinos., Comment: 13 pages, 3 figures. submitted to Astrophysical Journal

Published
2008
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6. Demonstration of a solid deuterium source of ultra-cold neutrons

Author

Saunders, A., Anaya, J. M., Bowles, T. J., Filippone, B. W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, G. E., Ito, T. M., Jones, K. W., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C. -Y., Makela, M., Marek, L. J., Martin, J. W., Morris, C. L., Mortensen, R. N., Pichlmaier, A., Seestrom, S. J., Serebrov, A., Smith, D., Teasdale, W., Tipton, B., Vogelaar, R. B., Young, A. R., and Yuan, J.

Subjects
Nuclear Experiment
Abstract

Ultra-cold neutrons (UCN), neutrons with energies low enough to be confined by the Fermi potential in material bottles, are playing an increasing role in measurements of fundamental properties of the neutron. The ability to manipulate UCN with material guides and bottles, magnetic fields, and gravity can lead to experiments with lower systematic errors than have been obtained in experiments with cold neutron beams. The UCN densities provided by existing reactor sources limit these experiments. The promise of much higher densities from solid deuterium sources has led to proposed facilities coupled to both reactor and spallation neutron sources. In this paper we report on the performance of a prototype spallation neutron-driven solid deuterium source. This source produced bottled UCN densities of 145 +/-7 UCN/cm3, about three times greater than the largest bottled UCN densities previously reported. These results indicate that a production UCN source with substantially higher densities should be possible.

Published
2003
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7. Measurement of the 3He mass diffusion coefficient in superfluid 4He over the 0.45-0.95 K temperature range

Author

Lamoreaux, S. K., Archibald, G., Barnes, P. D., Buttler, W. T., Clark, D. J., Cooper, M. D., Espy, M., Greene, G. L., Golub, R., Hayden, M. E., Lei, C., Marek, L. J., Peng, J. -C., and Penttila, S.

Subjects
Condensed Matter
Abstract

We have measured the mass diffusion coefficient D of 3He in superfluid 4He at temperatures lower than were previously possible. The experimental technique utilizes scintillation light produced when neutron react with 3He nuclei, and allows measurement of the 3He density integrated along the trajectory of a well-defined neutron beam. By measuring the change in 3He density near a heater as a function of applied heat current, we are able to infer values of D with 20% accuracy. At temperatures below 0.7 K and for concentrations of order 10^{-4} we find D=(2.0+2.4-1.2)T^-(6.5 -/+ 1.2) cm^2/s, in agreement with a theoretical approximation., Comment: 8 pages, 5 figures. Submitted to Europhysics Letters and prepared in that journal's format

Published
2001
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8. Measurements of ultracold neutron lifetimes in solid deuterium

Author

Morris, C. L., Anaya, J. M., Bowles, T. J., Filippone, B. W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, G. E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C. -Y., Makela, M., Marek, L. J., Martin, J. W., Mortensen, R. N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., and Yuan, J.

Subjects
Nuclear Experiment
Abstract

We present the first measurements of the survival time of ultracold neutrons (UCNs) in solid deuterium SD2. This critical parameter provides a fundamental limitation to the effectiveness of superthermal UCN sources that utilize solid ortho-deuterium as the source material. Superthermal UCN sources offer orders of magnitude improvement in the available densities of UCNs, and are of great importance to fundamental particle-physics experiments such as searches for a static electric dipole moment and lifetime measurements of the free neutron. These measurements are performed utilizing a SD2 source coupled to a spallation source of neutrons, providing a demonstration of UCN production in this geometry and permitting systematic studies of the influence of thermal up-scatter and contamination with para-deuterium on the UCN survival time., Comment: 5 pages, 3 figures, revtex4

Published
2001
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9. Publisher’s Note: Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeV [Phys. Rev. Lett.104, 161101 (2010)]

Author

Abbasi, R. U., primary, Abu-Zayyad, T., additional, Al-Seady, M., additional, Allen, M., additional, Amman, J. F., additional, Anderson, R. J., additional, Archbold, G., additional, Belov, K., additional, Belz, J. W., additional, Bergman, D. R., additional, Blake, S. A., additional, Brusova, O. A., additional, Burt, G. W., additional, Cannon, C., additional, Cao, Z., additional, Deng, W., additional, Fedorova, Y., additional, Finley, C. B., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G., additional, Hüntemeyer, P., additional, Ivanov, D., additional, Jones, B. F., additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Loh, E. C., additional, Liu, J., additional, Lundquist, J. P., additional, Maestas, M. M., additional, Manago, N., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Moore, S. A., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M., additional, Rodriguez, D., additional, Sasaki, N., additional, Schnetzer, S. R., additional, Scott, L. M., additional, Sinnis, G., additional, Smith, J. D., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Stratton, S., additional, Thomas, S. B., additional, Thomas, J. R., additional, Thomson, G. B., additional, Tupa, D., additional, Zech, A., additional, and Zhang, X., additional

Published
2010
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10. Indications of Proton-Dominated Cosmic-Ray Composition above 1.6 EeV

Author

Abbasi, R. U., primary, Abu-Zayyad, T., additional, Al-Seady, M., additional, Allen, M., additional, Amman, J. F., additional, Anderson, R. J., additional, Archbold, G., additional, Belov, K., additional, Belz, J. W., additional, Bergman, D. R., additional, Blake, S. A., additional, Brusova, O. A., additional, Burt, G. W., additional, Cannon, C., additional, Cao, Z., additional, Deng, W., additional, Fedorova, Y., additional, Finley, C. B., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G., additional, Hüntemeyer, P., additional, Ivanov, D., additional, Jones, B. F., additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Loh, E. C., additional, Liu, J., additional, Lundquist, J. P., additional, Maestas, M. M., additional, Manago, N., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Moore, S. A., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M., additional, Rodriguez, D., additional, Sasaki, N., additional, Schnetzer, S. R., additional, Scott, L. M., additional, Sinnis, G., additional, Smith, J. D., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Stratton, S., additional, Thomas, S. B., additional, Thomas, J. R., additional, Thomson, G. B., additional, Tupa, D., additional, Zech, A., additional, and Zhang, X., additional

Published
2010
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11. Measurements of Ultracold-Neutron Lifetimes in Solid Deuterium

Author

Morris, C. L., Anaya, J.M., Bowles, T. J., Filippone, B.W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C.-Y., Makela, M., Marek, L. J., Martin, J.W., Mortensen, N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., Yuan, J., Morris, C. L., Anaya, J.M., Bowles, T. J., Filippone, B.W., Geltenbort, P., Hill, R. E., Hino, M., Hoedl, S., Hogan, E., Ito, T. M., Kawai, T., Kirch, K., Lamoreaux, S. K., Liu, C.-Y., Makela, M., Marek, L. J., Martin, J.W., Mortensen, N., Pichlmaier, A., Saunders, A., Seestrom, S. J., Smith, D., Teasdale, W., Tipton, B., Utsuro, M., Young, A. R., and Yuan, J.

Abstract

We present the first measurements of the survival time of ultracold neutrons (UCNs) in solid deuterium (SD2). This critical parameter provides a fundamental limitation to the effectiveness of superthermal UCN sources that utilize solid ortho-deuterium as the source material. These measurements are performed utilizing a SD2 source coupled to a spallation source of neutrons, providing a demonstration of UCN production in this geometry and permitting systematic studies of the influence of thermal up-scatter and contamination with para-deuterium on the UCN survival time.

Published
2002

12. An Upper Limit on the Electron‐Neutrino Flux from the HiRes Detector

Author

Abbasi, R. U., primary, Abu‐Zayyad, T., additional, Allen, M., additional, Amann, J. F., additional, Archbold, G., additional, Belov, K., additional, Belz, J. W., additional, Zvi, S. Y. Ben, additional, Bergman, D. R., additional, Biesiadecka, A., additional, Blake, S. A., additional, Boyer, J. H., additional, Brusova, O. A., additional, Burt, G. W., additional, Cannon, C., additional, Cao, Z., additional, Deng, W., additional, Fedorova, Y., additional, Findlay, J., additional, Finley, C. B., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G., additional, Hüntemeyer, P., additional, Ivanov, D., additional, Jones, B. F, additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Knapp, B. C., additional, Loh, E. C., additional, Maestas, M. M., additional, Manago, N., additional, Mannel, E. J., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Moore, S. A., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M. D., additional, Rodriguez, D., additional, Sasaki, M., additional, Schnetzer, S. R., additional, Scott, L. M., additional, Seman, M., additional, Sinnis, G., additional, Smith, J. D., additional, Snow, R., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Stratton, S. R., additional, Thomas, J. R., additional, Thomas, S. B., additional, Thomson, G. B., additional, Tupa, D., additional, Wiencke, L. R., additional, Zech, A., additional, and Zhang, X., additional

Published
2008
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13. Measurement of the 3 He mass diffusion coefficient in superfluid 4 He over the 0.45–0.95 K temperature range

Author

Lamoreaux, S. K., primary, Archibald, G., additional, Barnes, P. D., additional, Buttler, W. T., additional, Clark, D. J., additional, Cooper, M. D., additional, Espy, M., additional, Greene, G. L., additional, Golub, R., additional, Hayden, M. E., additional, Lei, C., additional, Marek, L. J., additional, Peng, J.-C., additional, and Penttila, S., additional

Published
2008
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14. First Observation of the Greisen-Zatsepin-Kuzmin Suppression

Author

Abbasi, R. U., primary, Abu-Zayyad, T., additional, Allen, M., additional, Amman, J. F., additional, Archbold, G., additional, Belov, K., additional, Belz, J. W., additional, Ben Zvi, S. Y., additional, Bergman, D. R., additional, Blake, S. A., additional, Brusova, O. A., additional, Burt, G. W., additional, Cannon, C., additional, Cao, Z., additional, Connolly, B. C., additional, Deng, W., additional, Fedorova, Y., additional, Finley, C. B., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G., additional, Hüntemeyer, P., additional, Jones, B. F, additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Loh, E. C., additional, Maestas, M. M., additional, Manago, N., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Moore, S. A., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M., additional, Rodriguez, D., additional, Sasaki, N., additional, Schnetzer, S. R., additional, Scott, L. M., additional, Sinnis, G., additional, Smith, J. D., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Thomas, S. B., additional, Thomas, J. R., additional, Thomson, G. B., additional, Tupa, D., additional, Westerhoff, S., additional, Wiencke, L. R., additional, Zhang, X., additional, and Zech, A., additional

Published
2008
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15. Search for Point Sources of Ultra–High‐Energy Cosmic Rays above 4.0 x 1019eV Using a Maximum Likelihood Ratio Test

Author

Abbasi, R. U., primary, Abu‐Zayyad, T., additional, Amann, J. F., additional, Archbold, G., additional, Atkins, R., additional, Bellido, J. A., additional, Belov, K., additional, Belz, J. W., additional, Ben‐Zvi, S. Y., additional, Bergman, D. R., additional, Boyer, J. H., additional, Burt, G. W., additional, Cao, Z., additional, Clay, R. W., additional, Connolly, B. M., additional, Dawson, B. R., additional, Deng, W., additional, Farrar, G. R., additional, Fedorova, Y., additional, Findlay, J., additional, Finley, C. B., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hughes, G. A., additional, Huntemeyer, P., additional, Jui, C. C. H., additional, Kim, K., additional, Kirn, M. A., additional, Knapp, B. C., additional, Loh, E. C., additional, Maestas, M. M., additional, Manago, N., additional, Mannel, E. J., additional, Marek, L. J., additional, Martens, K., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, O’Neill, A., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M. D., additional, Sasaki, M., additional, Schnetzer, S. R., additional, Seman, M., additional, Simpson, K. M., additional, Sinnis, G., additional, Smith, J. D., additional, Snow, R., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Thomas, J. R., additional, Thomas, S. B., additional, Thomson, G. B., additional, Tupa, D., additional, Westerhoff, S., additional, Wiencke, L. R., additional, and Zech, A., additional

Published
2005
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16. Neutron-Detected Tomography of Impurity-Seeded Superfluid Helium

Author

Hayden, M. E., primary, Archibald, G., additional, Barnes, P. D., additional, Buttler, W. T., additional, Clark, D. J., additional, Cooper, M. D., additional, Espy, M., additional, Golub, R., additional, Greene, G. L., additional, Lamoreaux, S. K., additional, Lei, C., additional, Marek, L. J., additional, Peng, J.-C., additional, and Penttila, S. I., additional

Published
2004
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17. Measurement of the Flux of Ultrahigh Energy Cosmic Rays from Monocular Observations by the High Resolution Fly’s Eye Experiment

Author

Abbasi, R. U., primary, Abu-Zayyad, T., additional, Amann, J. F., additional, Archbold, G., additional, Bellido, J. A., additional, Belov, K., additional, Belz, J. W., additional, Bergman, D. R., additional, Cao, Z., additional, Clay, R. W., additional, Cooper, M. D., additional, Dai, H., additional, Dawson, B. R., additional, Everett, A. A., additional, Fedorova, Yu. A., additional, Girard, J. H. V., additional, Gray, R. C., additional, Hanlon, W. F., additional, Hoffman, C. M., additional, Holzscheiter, M. H., additional, Hüntemeyer, P., additional, Jones, B. F, additional, Jui, C. C. H., additional, Kieda, D. B., additional, Kim, K., additional, Kirn, M. A., additional, Loh, E. C., additional, Manago, N., additional, Marek, L. J., additional, Martens, K., additional, Martin, G., additional, Matthews, J. A. J., additional, Matthews, J. N., additional, Meyer, J. R., additional, Moore, S. A., additional, Morrison, P., additional, Moosman, A. N., additional, Mumford, J. R., additional, Munro, M. W., additional, Painter, C. A., additional, Perera, L., additional, Reil, K., additional, Riehle, R., additional, Roberts, M., additional, Sarracino, J. S., additional, Sasaki, M., additional, Schnetzer, S. R., additional, Shen, P., additional, Simpson, K. M., additional, Sinnis, G., additional, Smith, J. D., additional, Sokolsky, P., additional, Song, C., additional, Springer, R. W., additional, Stokes, B. T., additional, Taylor, S. F., additional, Thomas, S. B., additional, Thompson, T. N., additional, Thomson, G. B., additional, Tupa, D., additional, Westerhoff, S., additional, Wiencke, L. R., additional, VanderVeen, T. D., additional, Zech, A., additional, and Zhang, X., additional

Published
2004
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18. Measurements of Ultracold-Neutron Lifetimes in Solid Deuterium

Author

Morris, C. L., primary, Anaya, J. M., additional, Bowles, T. J., additional, Filippone, B. W., additional, Geltenbort, P., additional, Hill, R. E., additional, Hino, M., additional, Hoedl, S., additional, Hogan, G. E., additional, Ito, T. M., additional, Kawai, T., additional, Kirch, K., additional, Lamoreaux, S. K., additional, Liu, C.-Y., additional, Makela, M., additional, Marek, L. J., additional, Martin, J. W., additional, Mortensen, R. N., additional, Pichlmaier, A., additional, Saunders, A., additional, Seestrom, S. J., additional, Smith, D., additional, Teasdale, W., additional, Tipton, B., additional, Utsuro, M., additional, Young, A. R., additional, and Yuan, J., additional

Published
2002
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19. Measurement of the 3 He mass diffusion coefficient in superfluid 4 He over the 0.45–0.95 K temperature range

Author

Lamoreaux, S. K, primary, Archibald, G, additional, Barnes, P. D, additional, Buttler, W. T, additional, Clark, D. J, additional, Cooper, M. D, additional, Espy, M, additional, Greene, G. L, additional, Golub, R, additional, Hayden, M. E, additional, Lei, C, additional, Marek, L. J, additional, Peng, J.-C, additional, and Penttila, S, additional

Published
2002
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23. Neutron radiography of helium II

Author

Hayden, M. E., Archibald, G., Barnes, P. D., Buttler, W. T., Clark, D. J., Cooper, M. D., Espy, M., Greene, G. L., Golub, R., Lamoreaux, S. K., Lei, C., Marek, L. J., Peng, J.-C., and Penttila, S.

Subjects
*SUPERFLUIDITY, *HELIUM
Abstract

We have used a neutron radiography technique to investigate the spatial distribution of 3He atoms in very dilute liquid 3He–4He mixtures at temperatures below the superfluid transition temperature. By imposing heat currents and monitoring the subsequent redistribution of 3He within the sample volume we obtain a direct measurement of the relevant mass diffusion coefficient. Data from these experiments provides a striking demonstration of the manner in which the distribution of impurity atoms within the liquid can be influenced by the presence of a free surface. [Copyright &y& Elsevier]

Published
2003
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24. LC/MS analysis of cyclohexanedione oxime herbicides in water.

Author

Marek LJ, Koskinen WC, and Bresnahan GA

Subjects
Chromatography, Liquid, Mass Spectrometry, Cyclohexanones chemistry, Herbicides chemistry, Water Pollutants, Chemical analysis
Abstract

A multiresidue method for the determination of alloxydim (methyl 2, 2-dimethyl-4, 6-dioxo-5-[1-[2-propenyloxy)amino]butylidene]cyclohexanec arb oxylate), clethodim (E, E)-(+/-)-2-[1-[[3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio )propyl]-3-hydroxy-2-cyclohexen-1-one), sethoxydim ((+/-)-2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl]-3-hydroxy-2 -cy clohexen-1-one), and two metabolites, clethodim sulfoxide ((E, E)-(+/-)-2-[1-[[3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylsulf inyl)propyl]-3-hydroxy-2-cyclohexen-1-one) and sethoxydim sulfoxide ((+/-)-2-[1-(ethoxyimino)butyl]-5-[2-ethylsulfinyl)propyl]-3 -hydroxy- 2-cyclohexen-1-one), in water by high-performance liquid chromatography/electrospray/mass spectrometry (LC/ES/MS) is reported. River water and distilled water were spiked at 0.08 and 0.8 microgram L(-1) with all three herbicides, which were then extracted from the water by C(18)-SPE (SPE = solid-phase extraction). The herbicides and metabolites were quantified and confirmed using selected ion monitoring. The percent recoveries of the herbicides from water spiked at 0.8 microgram L(-1) were as follows: alloxydim, 117 +/- 11%; clethodim, 96 +/- 14%; sethoxydim, 89 +/- 13%. There was no evidence of oxidation of clethodim and sethoxydim during the extraction to their respective sulfoxides. The limit of quantitation was <0.1 microgram L(-1). We have shown that we can analyze and confirm three cyclohexanedione oxime herbicides and two metabolites in water by LC/ES/MS. This multiresidue method should also be appropriate for other cyclohexanedione oximes.

Published
2000
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25. Modification of the Kalish osteotomy to correct the proximal articular set angle.

Author

Hill RS and Marek LJ

Subjects
Adolescent, Adult, Aged, Bone Wires, Female, Follow-Up Studies, Hallux Valgus diagnostic imaging, Hallux Valgus pathology, Humans, Middle Aged, Osteotomy instrumentation, Radiography, Hallux Valgus surgery, Osteotomy methods
Abstract

A preliminary report of a new bunion procedure is described. This new procedure provides a relative reduction of the intermetatarsal angle and corrects the proximal articular set angle, yet incorporates the principles of compressive rigid internal fixation. The procedure is best summarized as a combination of the Kalish modification of the Austin bunionectomy and the Green-Laird modification of the Reverdin bunionectomy.

Published
1990
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