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Single Pi- production in np collisions for excess energies up to 90 MeV

Abdel-Bary, M.; Brinkmann, K.-T.; Clement, H.; Doroshkevich, E.; Dshemuchadse, S.; Erhardt, A.; Eyrich, W.; Freiesleben, H.; Gillitzer, A.; Jäkel, R.; Karsch, L.; Kilian, K.; Kuhlmann, E.; Möller, K.; Morsch, H. P.; Naumann, L.; Paul, N.; Pizzolotto, C.; Ritman, J.; Roderburg, E.; Schroeder, W.; Schulte-Wissermann, M.; Sefzick, T.; Teufel, A.; Ucar, A.; Ullrich, W.; Wintz, P.; Wüstner, P.; Zupranski, P.
The quasifree reaction np -> pppi- 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 Pn 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.
Keywords: 13.75.Cs - Nucleon-nucleon interactions (including antinucleons, deuterons, etc.). 25.10.+s - Nuclear reactions involving few-nucleon systems.
  • European Physical Journal A 36(2008), DOI: 10.1140/epja/i2007-10543-x


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Publ.-Id: 11315