O. Schapiro et Dhe. Gross, IMF IMF CORRELATIONS 3-4-FRAGMENT CORRELATIONS REVEAL DETAILS OF THE BREAKING PROCESS, Nuclear physics. A, 576(3), 1994, pp. 428-440
The existence of the Coulomb hole in the IMF-IMF correlation function
indicates the breakdown of independent sequential emission of an expan
ded or nonexpanded source. The Berlin multifragmentation model allows
to predict any many-fragment correlation with sufficient statistical a
ccuracy and to trace it back to a few parameters describing the freeze
-out configuration: At fixed freeze-out volume the width of the Coulom
b hole at low relative velocities is found to be independent of the fr
agmentation mode. This opens the possibility to determine the size of
the freeze-out. For low excitation energies a bump is seen at lower re
lative velocities in the correlation function. This rise is interprete
d as a signal of a very asymmetric hot fission. The reason for the bum
p is the presence of a very large fragment besides intermediate-mass f
ragments in multifragmentation events. We analysed the events from dif
ferent multifragmentation modes. Especially correlation functions for
fragmentation events with two very large fragments in addition to an I
MF pair may contain information on whether the emission process is sim
ultaneous and statistical, or if not, whether the decay is occurring f
irst by evaporation of smaller particles and then by fission of the re
st, or in the opposite way.