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INDRA at GSI

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Au Au 40 to 150 AMeV. Xe Sn 50 to 250 AMeV. C Au 95 to 1800 AMeV. INDRA at GSI ... A. Trzcinski et al., NIM A 501 (2003) 367. ring 7. r6. r10. r12. Centrality ... – PowerPoint PPT presentation

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Title: INDRA at GSI


1
INDRA at GSI
November 1997 April 1999
Z3 Au Au 80 AMeV Very peripheral
2
INDRA at GSI
3
INDRA at GSI
Phys. Rev. C 66, 064606 (2002)
4
Stability
336 CsI(Tl)
5
Stability
6
Stability
7
Identification
Ring 1
Pârlog parameterization
8
Calibration check
12C 1H at 30 AMeV
r6
r10
ring 7
r12
A. Trzcinski et al., NIM A 501 (2003) 367
9
Motivation
Tsang et al. PRL 71, 1502 (1993)
Reisdorf Ritter, Ann. Rev. Nucl. Part. Sci.
Centrality
10
Motivation
Invariant cross sections for Au Au at
peripheral impact parameters
From the Fermi to the relativistic domain
11
Global variables and impact parameter
Xe Sn at 50 A MeV
Au Au at 60 A MeV
12
Part I

Central Au Au
y
Z 3 at 100 A MeV
13
Multiplicities
in central collisions
14
Multiplicities
15
Multiplicities
16
Multiplicities
17
Flow and fragmentation
Statistical model descriptions with decoupled
flow
SMM F. Lavaud, thesis
MMMC A. Le Fèvre et al.
18
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.
19
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.
20
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 ?
21
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
22
Directed flow
Au Au, Z 2 midcentral scaled variables
projections on x-z plane
23
Directed flow
work in progress J. Lukasik et al.
Au Au, Z 2 midcentral scaled variables
projections on x-z plane
24
Directed flow
work in progress J. Lukasik et al.
Au Au, Z 2 midcentral scaled variables
25
Directed flow
Au Au, Z 2 midcentral scaled variables
26
Directed flow
Au Au, Z 2 and Z 1 midcentral scaled
variables
27
Directed flow
Z 2 and Z 1
and Z 3
28
Part II

Peripheral Au Au
y
Z 3 at 100 A MeV
29
Rapidity distributions
Z 3 at 80 A MeV
30
Transverse velocity spectra
100 A MeV Z 3
J. Lukasik et al., Phys. Rev. C 66, 064606 (2002)
31
Contributions to transverseenergies
at midrapidity
Fermi motion is not enough N-N scattering is too
much Compensation due to Coulomb
32
ExtendedGoldhaber model
in 3 steps
J. Lukasik et al., Phys. Lett. B, in print (2003)
33
Model results
34
Comparison
model
35
Comparison
model
data
36
Quantitativedescription of data
37
Quantitativedescription of data
38
Quantitativedescription of data
40
60
80
100
150
39
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
40
Origin of fragments
41
Summary
42
the end
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