Measurement of the pionium lifetime
  We report the progress in the measurement of the pionium lifetime by the DIRAC Collaboration at CERN (PS212). Based on data collected in 2001-2003 on Ni targets we have achieved the precision of 11% in the measurement of the pionium lifetime, which corresponds to the measurement of S-wave pion-pion scattering lengths difference |a0-a2| with the accuracy of 6%. 
M. Zhabitsky (Joint Institute for Nuclear Research, Dubna) (for the   DIRAC Collaboration)