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First observations of Pontecorvo reactions with a recoiling neutron

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Zeitschrift für Physik A Hadrons and Nuclei

Abstract

We report the first observations of Pontecorvo reactions of the type ¯pd →Xn. We fully reconstruct the outgoing meson and, for antiprotons stopped in liquid deuterium, we measure: BR(¯pd→π0)=(7.03±0.72)×10−6, BR(¯pd→ηn)=(3.19+0.48)×10−6, BR(¯pd→ωn)=(22.8+4.1)×10−6, BR(¯pd→η′n)14×10−6 (at 95% confidence level). Assuming charge independence, our result for¯ pd→π0n is compatible with measurements of the only other observed Pontecorvo reaction ¯pd → π−p. The experimental ratios between the above branching ratios are in fair agreement with both the statistical model and dynamical two-step models (assumingN¯ N annihilation into two mesons, with subsequent absorption of one meson on the remaining nucleon). This agreement suggests that there may be appreciable rates for Pontecorvo reactions producing final state mesons with masses above 1 GeV.

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Author information

Author notes

  1. D. S. Armstrong

    Present address: William & Mary College, 23187, Williamsburg, VA, USA

  2. I. Augustin

    Present address: University of Siegen, Siegen, Germany

  3. M. Burchell & J. Kisiel

    Present address: University of Kent, Canterbury, UK

  4. M. Kobel

    Present address: University of Freiburg, Freiburg, Germany

  5. E. Schäfer

    Present address: CERN, CH-1211, Genève, Switzerland

Authors and Affiliations

  1. University of California, LBL, 94720, Berkeley, CA, USA

    D. S. Armstrong, P. Birien, R. Bossingham, T. Case, K. M. Crowe, F. H. Heinsius & M. Lakata

  2. Universität Bochum, D-44780, Bochum, Germany

    K. Beuchert, T. Degener, H. Koch, M. Kunze, J. Lüdemann, H. Matthäy, K. Peters, S. Ravndal, H. Stöck & D. Walther

  3. Universität Bonn, D-53115, Bonn, Germany

    E. Klempt & C. Straßburger

  4. Academy of Science, H-1525, Budapest, Hungary

    P. Hidas & G. Pinter

  5. Rutherford Appleton Laboratory, OX 11 0QX, Chilton, Didcot, UK

    C. A. Baker, C. J. Batty & C. N. Pinder

  6. CERN, CH-1211, Genève, Switzerland

    M. Burchell, M. Doser, N. P. Hessey, M. Kobel, R. Landua, L. Montanet & J. Zoll

  7. Universität Hamburg, D-22761, Hamburg, Germany

    T. Kiel, P. Schmidt, U. Strohbusch & U. Wiedner

  8. Universität Karlsruhe, D-76344, Karlsruhe, Germany

    I. Augustin, P. Blüm, D. Engelhardt, B. Kämmle, J. Kuhn, U. Thoma & N. Winter

  9. Queen Mary and Westfield College, E1 4NS, London, UK

    D. V. Bugg, A. Cooper & B. S. Zou

  10. University of California, 90024, Los Angeles, CA, USA

    R. P. Haddock

  11. Universität Mainz, D-55099, Mainz, Germany

    B. M. Barnett, J. Brose, R. Hackmann, M. Herz, H. Kalinowsky, M. Merkel, J. P. Merlo, E. Schäfer, S. Spanier & F. Walter

  12. Universität MÜnchen, D-80333, München, Germany

    K. Braune, O. Cramer, H. P. Dietz, W. Dünnweber, M. Englert, M. A. Faessler, C. Felix, P. Illinger, D. Jamnik, J. Kisiel, C. Kolo, K. Königsmann, C. Völcker & Č Zupančič

  13. Carnegie Mellon University, Pittsburgh, Pennsylvania, USA

    C. A. Meyer

  14. Centre de Recherches Nucléaires, F-67037, Strasbourg, France

    M. Suffert

  15. Universität Zürich, CH-8001, Zürich, Switzerland

    C. Amsler, S. v. Dombrowski, A. Noble, F. Ould-Saada & D. Urner

Authors
  1. C. Amsler
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  2. D. S. Armstrong
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  3. I. Augustin
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  4. C. A. Baker
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  5. B. M. Barnett
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  6. C. J. Batty
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  7. K. Beuchert
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  8. P. Birien
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  9. P. Blüm
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  10. R. Bossingham
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  11. K. Braune
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  12. J. Brose
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  13. D. V. Bugg
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  14. M. Burchell
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  15. T. Case
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  16. A. Cooper
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  19. T. Degener
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  21. S. v. Dombrowski
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  22. M. Doser
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  23. W. Dünnweber
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  24. D. Engelhardt
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  27. C. Felix
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  30. F. H. Heinsius
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  31. M. Herz
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  32. N. P. Hessey
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  33. P. Hidas
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  34. P. Illinger
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  35. D. Jamnik
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  36. H. Kalinowsky
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  37. B. Kämmle
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  38. T. Kiel
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  39. J. Kisiel
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  40. E. Klempt
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  41. M. Kobel
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  42. H. Koch
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  43. C. Kolo
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  44. K. Königsmann
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  45. J. Kuhn
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  46. M. Kunze
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  47. M. Lakata
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  48. R. Landua
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  54. L. Montanet
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  55. A. Noble
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  56. F. Ould-Saada
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  60. S. Ravndal
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  61. E. Schäfer
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  67. M. Suffert
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  68. U. Thoma
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  69. D. Urner
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  70. C. Völcker
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  71. F. Walter
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  73. U. Wiedner
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  74. N. Winter
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  75. J. Zoll
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  76. B. S. Zou
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  77. Č Zupančič
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Consortia

The Crystal Barrel Collaboration

Additional information

On leave of absence from the University of Ljubljana, Ljubljana, Slovenia

On leave of absence from the University of Silesia, Katowice, Poland

This work forms part of the Ph.D thesis of E. Schäfer

We would like to thank the technical staff of the LEAR machine group and of all the participating institutions for their invaluable contributions to the success of the experiment. We acknowledge financial support from the German Bundesministerium für Forschung und Technologie, the Schweizerischer Nationalfonds, the British Science and Engineering Research Council and the US Department of Energy (contracts No. DE-FG03-87ER40323 and DE-AC03-76SF00098). K. Crowe, F.H. Heinsius and J. Kisiel have benefited from financial support provided by the Alexander von Humboldt Foundation.

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Amsler, C., Armstrong, D.S., Augustin, I. et al. First observations of Pontecorvo reactions with a recoiling neutron. Z. Physik A - Hadrons and Nuclei 351, 325–331 (1995). https://doi.org/10.1007/BF01290916

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  • DOI: https://doi.org/10.1007/BF01290916

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