Subject: Minute of the PEP-N Italian meeting (Ferrara Dec. 22). 

Dear All, 

as you know on Dec. 22-nd in Ferrara was held the PEP-N Italian meeting, 
the following topics have been discussed: 


  ---- MAGNET ---- 
 
  The CERN magnet is no longer available, another magnet has been
  simulated by Diego Bettoni, these are some  parameters: 
  
  -> distance between poles:  1.0 m  
  -> pole diameter         :  1.2 m
  -> distance between yokes:  2.0 m 
  -> magnetic field        :  3.0 Kgauss  

  results of the simulation were shown. Diego will discuss it with  
  SLAC accelerator people. 



  --- CENTRAL TRACKING ---

  Two hypothesis have been considered:  
                                      - wire chamber 
                                      - TPC 
  The TPC would give a good dE/dx measurement, would have a  high
  acceptance and low amount of material. The wire chamber would need 
  thicker support for the wires. 
  It's not clear anyway if a TPC will work with a low and not very 
  homogeneous magnetic field.  
  M.Morandin and R.Calabrese will study the problem. 
  
  Some Simulations with "Garfield" are needed to understand the behaviour 
  of these chambers, the reference people are D.Bettoni, M.posocco .  
      
   
  --- CALORIMETER --- 

  The possibility of using the L3 endcaps calorimeters has been proposed 
  and discussed with B.Borgia. 
  They are made by 2000 BGO blocks with a geometry pointing  
  at a distance of about 70 cm. This could limit the acceptance 
  of the central tracking.
  
  Bruno will discuss with his L3 collaborators at the mid January
  coll. meeting about the availability of the endcaps. 


  --- MONTE CARLO SIMULATIONS ---

  Some GEANT studies have been done by M.Posocco and M.Negrini with 
  a first approximation of the geometry.  
  Some results about the acceptance of the apparatus for 6 pions (four 
  charged and two pi0) have been shown. The acceptance for detecting 
  all the 4 charged pions is about 70%, wich is lower than expected. 
  Some checks will be done.  
   
  M.Posocco made all the MC routines available through the web at the 
  Padova-NANAR home page: 
  http://www.pd.infn.it/~stroili/pepn/cvs.html  
  a password is required, please ask Mario if you want to use it.  



   --- FURTHER STUDIES --- 

  Further MC studies need to be done to understand:   
                                    
                           - multi-hadrons with pions 
                           - multi-hadrons with kaons 
                           - n - nbar
                           - control channels (mu+ mu-, e+e-, gamma-gamma)

 
  Frascati + Rome will take care of the two body reactions (control
  channels, n - nbar, p-pbar), Rinaldo will study the relative weight of
  the multihadronic channels. Ferrara and Padova will keep studying the 
  multihadrons. 


  We wish you a happy new year 


                                       Matteo & Wander