| Author:
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Jerzy Lukasik, Institute of Nuclear Physics, Krakow, Poland
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| Talk:
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Presented in the GSI "Palaver" on November 12th, 1997
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| Abstract:
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The experimental data obtained with the 4-pi multidetector system
INDRA are used to study the evolution of the Light Charge Particle
(LCP) and Intermediate Mass Fragment (IMF) production in peripheral
and semi-central collisions of Xe+Sn at incident energies from 25
to 50 MeV/nucleon. It has been found that a sizeable fraction of
IMF's and LCP's originates from the mid-velocity region. These
particles can be seen to come either from a prompt (preequilibrium)
mechanism or from a slower, but also dynamically influenced,
emissions (neck formation and dynamical break-up). The importance of
this effect increases with the bombarding energy leading from
DIC-like picture towards the participant-spectator scenario. The
size of this effect, its comparison with statistical emission, and
their dependence on bombarding energy, will be presented as a
function of transverse energy of LCP's, used as a measure of the
(non)centrality of the collision. The results are compared to
dynamical models, with which a good agreement is obtained.
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| Transparencies:
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The 16 transparencies are available as individual Postscript files.
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16
By filename
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Energy dependence of mid-velocity emissions for Xe+Sn