INDRA at GSI

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INDRA at GSI
November 1997 April 1999
Z3 Au Au 80 AMeV Very peripheral
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INDRA at GSI
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INDRA at GSI
Phys. Rev. C 66, 064606 (2002)
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Stability
336 CsI(Tl)
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Stability
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Stability
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Identification
Ring 1
Pârlog parameterization
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Calibration check
12C 1H at 30 AMeV
r6
r10
ring 7
r12
A. Trzcinski et al., NIM A 501 (2003) 367
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Motivation
Tsang et al. PRL 71, 1502 (1993)
Reisdorf Ritter, Ann. Rev. Nucl. Part. Sci.
Centrality
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Motivation
Invariant cross sections for Au Au at
peripheral impact parameters
From the Fermi to the relativistic domain
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Global variables and impact parameter
Xe Sn at 50 A MeV
Au Au at 60 A MeV
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Part I
?ß
Central Au Au
y
Z 3 at 100 A MeV
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Multiplicities
in central collisions
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Multiplicities
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Multiplicities
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Multiplicities
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Flow and fragmentation
Statistical model descriptions with decoupled
flow
SMM F. Lavaud, thesis
MMMC A. Le Fèvre et al.
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Flow and fragmentation
Au Au at 60
from MMMC model description with deformed source
(0.71) and with decoupled flow
A. Le Fèvre et al.
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Flow and fragmentation
Au Au at 60
variation of flow profile
from MMMC model description with deformed source
(0.71) and with decoupled flow
A. Le Fèvre et al.
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Questions
1) Why does the SMM or MMMC work so well in a
dynamical situation ?
2) Deformation as a dynamical constraint !
3) Radial flow should be another constraint !
Implicitly contained in parameters ?
Alternatively early fragment formation ?
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Flow and fragmentation
X. Campi et al., Phys. Rev. C 67, 044610 (2003)
shape of these distributions is characteristic
of the presence of Coulomb forces and close to
what is observed
for early fragment formation see also Danielewicz
and Pan, Dorso and Aichelin, Barz et al. and
others
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Directed flow
Au Au, Z 2 midcentral scaled variables
projections on x-z plane
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Directed flow
work in progress J. Lukasik et al.
Au Au, Z 2 midcentral scaled variables
projections on x-z plane
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Directed flow
work in progress J. Lukasik et al.
Au Au, Z 2 midcentral scaled variables
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Directed flow
Au Au, Z 2 midcentral scaled variables
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Directed flow
Au Au, Z 2 and Z 1 midcentral scaled
variables
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Directed flow
Z 2 and Z 1
and Z 3
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Part II
?ß
Peripheral Au Au
y
Z 3 at 100 A MeV
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Rapidity distributions
Z 3 at 80 A MeV
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Transverse velocity spectra
100 A MeV Z 3
J. Lukasik et al., Phys. Rev. C 66, 064606 (2002)
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Contributions to transverseenergies
at midrapidity
Fermi motion is not enough N-N scattering is too
much Compensation due to Coulomb
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ExtendedGoldhaber model
in 3 steps
J. Lukasik et al., Phys. Lett. B, in print (2003)
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Model results
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Comparison
model
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Comparison
model
data
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Quantitativedescription of data
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Quantitativedescription of data
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Quantitativedescription of data
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60
80
100
150
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Questions
1) Where is the equilibrated neck ?
2) Where is the equilibrated target/projectile
residue ?
3) Clustering criterion on a nucleon distribution
seems to be a general principle !
see also Gaitanos et al., Odeh et al., Gadioli
et al. and others
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Origin of fragments
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Summary
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the end