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New effects in low energy scattering of pµ atoms

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Abstract

Strong solid state effects in low energy scattering of pµ atoms in solid hydrogen are reported and analyzed. Such effects have been observed in TRIUMF experiment E742 where muons are stopped in thin frozen (3 K) layers of hydrogen. Emission of low energy pµ atoms from the hydrogen layer into adjacent vacuum was much higher than expected, based on calculations which ignored the solid nature of hydrogen. Monte Carlo simulations, performed using the scattering cross-sections with solid state effects taken into account, show the important role of the coherent elastic Bragg scattering in the diffusion of pµ atoms. For pµ energies lower than the Bragg cut-off limit (∼2 meV) the total scattering cross-section falls by several orders of magnitude, the hydrogen target becomes transparent and the emission of cold pµ atoms takes place.

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Authors and Affiliations

  1. Institute of Physics and Nuclear Techniques, PL-30059, Cracow, Poland

    J. Woźniak & M. Filipowicz

  2. Institute of Nuclear Physics, PL-31342, Cracow, Poland

    A. Adamczak

  3. University of Victoria, Victoria, BC, Canada, V8W 2Y2

    G.A. Beer, M. Maier, A. Olin & T.A. Porcelli

  4. Joint Institute for Nuclear Research, Dubna, 141980, Russia

    V.M. Bystritsky & V.A. Stolupin

  5. University of British Columbia, Vancouver, BC, Canada, V6T 2A6

    M.C. Fujiwara

  6. Gustavus Adolphus College, St. Peter, MN, 56082, USA

    T.M. Huber

  7. University of Fribourg, CH-1700, Fribourg, Switzerland

    R. Jacot-Guillarmod, P.E. Knowles & F. Mulhauser

  8. University of California, Berkeley, CA, 94720, USA

    P. Kammel

  9. Jeonbuk National University, 560-756, Jeonju City, S. Korea

    S.K. Kim

  10. University of Wyoming, Laramie, WY, 82071, USA

    A.R. Kunselman

  11. Paul Scherrer Institute, CH-5232, Villigen, Switzerland

    V.E. Markushin & C. Petitjean

  12. TRIUMF, Vancouver, BC, Canada, V6T 2A3

    G.M. Marshall

  13. Austrian Academy of Sciences, A-1090, Wien, Austria

    J. Zmeskal

Authors
  1. J. Woźniak
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  2. A. Adamczak
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  3. G.A. Beer
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  4. V.M. Bystritsky
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  5. M. Filipowicz
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  6. M.C. Fujiwara
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  7. T.M. Huber
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  8. R. Jacot-Guillarmod
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  9. P. Kammel
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  10. S.K. Kim
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  11. P.E. Knowles
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  12. A.R. Kunselman
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  13. M. Maier
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  14. V.E. Markushin
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  15. G.M. Marshall
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  16. F. Mulhauser
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  17. A. Olin
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  18. C. Petitjean
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  19. T.A. Porcelli
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  20. V.A. Stolupin
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  21. J. Zmeskal
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Woźniak, J., Adamczak, A., Beer, G. et al. New effects in low energy scattering of pµ atoms. Hyperfine Interactions 119, 63–69 (1999). https://doi.org/10.1023/A:1012602501617

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