Physikalisches Institut

WASA

WASA (Wide Angle Shower Apparatus)

WASA detector

Is a large-acceptance detector for charged and neutral particles. It had been installed at the CELSIUS storage ring in Uppsala (Sweden). In 2005 the detector was moved to continue its work at the Cooler Synchrotron COSY at Forschung Zentrum Jülich. It was installed in summer 2006 and has successfully taken several beam times since then. A number of important modifications of the detector elements have been done. The program of WASA@COSY comprises rare decays of "eta-meson" and "eta' -meson", isospin violating processes in particle reactions as well as the search for exotic processes. With regard to the latter two-pion production in nucleon-nucleon collisions has been studied out. The comparison of the behavior of pion-pion production in isoscalar, isovector and isotensor channels had been performed.

ABC Effect and Dibaryon Resonance

The ABC-effect in double-pionic fusion reactions is studied in the exclusive experiments for different beam particles, different targets and different energies. We find that the ABC effect is the result of a narrow exotic resonance, d*(2380), in the basic pn->dπ π process which survives even in nuclei.

For more information see:

Publications

For more recent publications see: INSPIRE

  1. Measurement of the eta->3pi0 Dalitz Plot Distribution with the WASA Detector at COSY
    WASA-at-COSY Collaboration (P. Vlasov et al.)
    Physics Letter B, Vol. 677, Issue 1-2, 2009
     
  2. Results on eta/eta-prime Decays from Hadron Machines
    CELSIUS/WASA and WASA-at-COSY Collaborations (A. Kupsc et al.)
    Nucl.Phys.Proc.Suppl.181-182:221-225,2008
     
  3. Proceedings of SCADRON70
    M. Büscher: The Light Scalar Mesons a0/f0(980) at COSY-Jülich,
    AIP Conf.Proc.1030:40-45,2008
     
  4. Proceedings of MENU2007
    * M. Wolke: Rare Eta Meson Decays with WASA-at-COSY
    * C. Pauly: 3pi0 final states with WASA at CELSIUS and COSY
    * B.R. Jany: EtaPrime Decays with WASA at COSY
    * C.F. Redmer: In search of the box anomaly with the WASA-at-COSY facility
    * L.Yurev, M.Janusz: From charged tracks to ChPT anomalies
    * T.Tolba: Preparations for a Pellet Tracking System
     
  5. Proceedings of Symposium on Meson Physics at COSY-11 and WASA-at-COSY
    * M. Hodana: Dynamics of the eta meson production in proton-proton collisions
    * P. Podkopal: Charge symmetry breaking in d d ---> alpha pi0
    * M. Janusz: Studies of the eta ---> pi+ pi- e+ e- decay channel
    * P. Vlasov: Status of the analysis of the p p ---> p p (eta --->3pi0) reaction
     
  6. Strangeness physics with the WASA detector at COSY
    A. Gillitzer, D. Grzonka (FZJ)
    Int.J.Mod.Phys.A20:539-542,2005
     
  7. Experiments with the WASA detector at COSY
    J. Ritman (Giessen U. & Julich, Forschungszentrum)
    Int.J.Mod.Phys.A20:525-531,2005
     
  8. WASA AT COSY
    S. Schadmand (FZJ))
    Proceedings of Eta05 Workshop, Cracow, Poland, 15-18 Sep 2005.
    Acta Phys.Slov.56:351-355,2006
     
  9. WASA finds a new home at COSY (January 2005)
    CERN Courier
     
  10. Proposal for the Wide Angle Shower Apparatus (WASA) at COSY-Julich: WASA at COSY
    WASA-at-COSY Collaboration (H.-H. Adam et al.)