Eric Plagnol: Opening remarks in ALADIN/INDRA meeting (11. Nov 1997)

A study of nuclear thermalized systems and of competing dynamical effects

• At low energies ( < 20 A Mev)
  • deep inelastic binary collisions
  • incomplete fusion - "compound nucleus"

• What has INDRA done @ GANIL
  1. Extraction of "one source events" compatible with a "compression - Expansion - Multifragmentation" scenario (Xe+Sn, Gd+U)
  2. Observation of very excited quasi projectile (Ar+Ni) which show:
     • vaporization
     • caloric curve features
  3. Significant "dynamically emitted" fragments and particles well reproduced by LV-QMD
  The consistency between 3 and the interpretation of 1 & 2 is debatable .

• What will INDRA do @ GSI ?
  At GSI, INDRA will find excellent systems and beam energies (Xe+Sn 50-150 A Mev; Au+Au 40-150 A Mev; C+Au 600-2000 A Mev; C+Sn).
  • The increased compression effects will test the thermalization hypothesis
  • The higher incident energies will allow a better separation of the sources

• The questions we would like to address today:
  • Should we extend our measurements up to 150 A Mev (tech. problems ...)
  • Should we use isotopically separated targets:
    What physics ? What signals ?
  • What is an appropriate statistics ?