Aircraft identification : friend or foe?

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While at higher degrees of energy damping both, mIl and me, are good and independent measures of dissipated energy, at lower dissipation only mIl is correlated with the excitation energy deposited in the system. 24 Skulski et al. m. 2 m. 2 o ~~~~~~~~ I ~~~~~~~~~ V""' / VNom Figure 2. Emission patterns of protons (upper row) and a-particles (lower row) in a Galilei-invariant representation of vpar versus vpup velocity components. Events of different degree of dissipation are selected based on the observed associated neutron multiplicity.

Some theoretical calculations support this new interpretation and predict an initial compression phase of the nuclear matter followed by an expansion phase during which the fragments are created 3, 4. Moreover a liquidgas phase transition could be associated with this multi fragmentation process 5. The new generation of 47r detector such as INDRA should give some reliable answers to these open questions in the next years. 2. EXPER~ENTALSE~UP The INDRA detector is dedicated to the measurement of the charge and of the kinematical properties of light particles and fragments.

The total reconstructed charge, ZSIIIII' shown in Fig. I, consequently peaked at Z =79. The analysis presented here required ZSIIIII =79 ± 3. 0 x 104 events met this criterion. For each event, we determine the multiplicity of charged fragments, m, and the number of charged fragments of nuclear charge Z,I1Z. Figure 2 shows the fragment charge yield distribution, llZ(Z), for different multiplicity intervals. At low multiplicities, the charge yield distribution shows the presence of a heavy residue and a number of light particles; some fission fragments may also be formed.

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