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The European Physical Journal A

, Volume 36, Issue 1, pp 7–16 | Cite as

Single \(\mathrm{\ensuremath{\pi^{-}}}\) production in np collisions for excess energies up to 90 MeV

  • The COSY-TOF Collaboration
  • M. Abdel-Bary
  • K. -Th. Brinkmann
  • H. Clement
  • E. Doroshkevich
  • S. Dshemuchadse
  • A. Erhardt
  • W. Eyrich
  • H. Freiesleben
  • A. Gillitzer
  • R. Jäkel
  • L. Karsch
  • K. Kilian
  • E. KuhlmannEmail author
  • K. Möller
  • H. P. Morsch
  • L. Naumann
  • N. Paul
  • C. Pizzolotto
  • J. Ritman
  • E. Roderburg
  • W. Schroeder
  • M. Schulte-Wissermann
  • Th. Sefzick
  • A. Teufel
  • A. Ucar
  • W. Ullrich
  • P. Wintz
  • P. Wüstner
  • P. Zupranski
Regular Article - Experimental Physics

Abstract.

The quasifree reaction \(np\rightarrow pp\ensuremath{\pi^{-}}\) was studied in a kinematically complete experiment by bombarding a liquid-hydrogen target with a deuteron beam of momentum 1.85GeV/c and analyzing the data along the lines of the spectator model. In addition to the three charged ejectiles the spectator proton was also detected in the large-acceptance time-of-flight spectrometer COSY-TOF. It was identified by its momentum and flight direction thus yielding access to the Fermi motion of the bound neutron and to the effective neutron 4-momentum vector \( \mathbb {P}\) n which differed from event to event. A range of almost 90MeV excess energy above threshold was covered. Energy-dependent angular distributions, invariant-mass spectra as well as fully covered Dalitz plots were deduced. Sizeable pp FSI effects were found as were contributions of p and d partial waves. In comparison with existing literature data the results provide a sensitive test of the spectator model. The behavior of the elementary cross-section σ01 close to threshold is discussed in view of new cross-section data.

PACS.

13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) 25.10.+s Nuclear reactions involving few-nucleon systems 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2008

Authors and Affiliations

  • The COSY-TOF Collaboration
  • M. Abdel-Bary
    • 4
  • K. -Th. Brinkmann
    • 1
  • H. Clement
    • 3
  • E. Doroshkevich
    • 3
  • S. Dshemuchadse
    • 1
  • A. Erhardt
    • 3
  • W. Eyrich
    • 2
  • H. Freiesleben
    • 1
  • A. Gillitzer
    • 4
  • R. Jäkel
    • 1
  • L. Karsch
    • 1
  • K. Kilian
    • 4
  • E. Kuhlmann
    • 1
    Email author
  • K. Möller
    • 5
  • H. P. Morsch
    • 4
    • 6
  • L. Naumann
    • 5
  • N. Paul
    • 4
  • C. Pizzolotto
    • 2
  • J. Ritman
    • 4
  • E. Roderburg
    • 4
  • W. Schroeder
    • 2
  • M. Schulte-Wissermann
    • 1
  • Th. Sefzick
    • 4
  • A. Teufel
    • 2
  • A. Ucar
    • 4
  • W. Ullrich
    • 1
  • P. Wintz
    • 4
  • P. Wüstner
    • 4
  • P. Zupranski
    • 6
  1. 1.Institut für Kern- und TeilchenphysikTechnische Universität DresdenDresdenGermany
  2. 2.Physikalisches InstitutUniversität ErlangenErlangenGermany
  3. 3.Physikalisches InstitutUniversität TübingenTübingenGermany
  4. 4.Institut für Kernphysik, Forschungszentrum JülichJülichGermany
  5. 5.Institut für Strahlenphysik, Forschungszentrum Dresden-RossendorfDresdenGermany
  6. 6.Andrzej Soltan Institute for Nuclear StudiesWarsawPoland

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