Isotopic dependence of the nuclear caloric curve.
The A/Z dependence of projectile fragmentation at relativistic energies has been studied with the ALADIN forward spectrometer at SIS. A stable beam of (124)Sn and radioactive beams of (124)La and (107)Sn at 600 MeV per nucleon have been used in order to explore a wide range of isotopic compositions. Chemical freeze-out temperatures are found to be nearly invariant with respect to the A/Z of the produced spectator sources, consistent with predictions for expanded systems. Small Coulomb effects (DeltaT approximately 0.6 MeV) appear for residue production near the onset of multifragmentation.
Sfienti
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GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany.
Adrich
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P
Aumann
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T
Bacri
C O
CO
Barczyk
T
T
Bassini
R
R
Bianchin
S
S
Boiano
C
C
Botvina
A S
AS
Boudard
A
A
Brzychczyk
J
J
Chbihi
A
A
Cibor
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J
Czech
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B
De Napoli
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M
Ducret
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JE
Emling
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H
Frankland
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JD
Hellström
M
M
Henzlova
D
D
Immè
G
G
Iori
I
I
Johansson
H
H
Kezzar
K
K
Lafriakh
A
A
Le Fèvre
A
A
Le Gentil
E
E
Leifels
Y
Y
Lühning
J
J
Lukasik
J
J
Lynch
W G
WG
Lynen
U
U
Majka
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Z
Mocko
M
M
Müller
W F J
WF
Mykulyak
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A
Orth
H
H
Otte
A N
AN
Palit
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R
Pawłowski
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P
Pullia
A
A
Raciti
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G
Rapisarda
E
E
Sann
H
H
Schwarz
C
C
Simon
H
H
Sümmerer
K
K
Trautmann
W
W
Tsang
M B
MB
Verde
G
G
Volant
C
C
Wallace
M
M
Weick
H
H
Wiechula
J
J
Wieloch
A
A
Zwiegliński
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B