Multiplicity correlations of intermediate-mass fragments with
pions and fast protons in 12C + 197Au
Multiplicity correlations of intermediate-mass fragments with
pions and fast protons in 12C + 197Au
| Authors: | K. Turzó,
G. Auger, M.L. Begemann-Blaich, N. Bellaize,
R. Bittiger, F. Bocage, B. Borderie,
R. Bougault, B. Bouriquet, J.L. Charvet,
A. Chbihi, R. Dayras, D. Durand,
J.D. Frankland, E. Galichet, D. Gourio,
D. Guinet, S. Hudan, G. Imme, P. Lautesse,
F. Lavaud, A. Le Fèvre, R. Legrain,
O. Lopez, J. Lukasik, U. Lynen, W.F.J. Müller,
L. Nalpas, H. Orth, E. Plagnol, G. Raciti,
E. Rosato, A. Saija, C. Schwarz, W. Seidel,
C. Sfienti, B. Tamain, W. Trautmann,
A. Trzcinski, E. Vient, M. Vigilante,
C. Volant, B. Zwieglinski, and A.S. Botvina
The INDRA and ALADIN Collaborations |
| Published: | Accepted by Eur. Phys. J. A
PrePrint GSI-2003-36, Dezember 2003 PrePrint nucl-ex/0402005 |
| Abstract: | Low-energy π+ (Eπ < 35 MeV)
from 12C + 197Au collisions at incident
energies from 300 to 1800 MeV per nucleon were detected with
the Si-Si(Li)-CsI(Tl) calibration telescopes of the
INDRA multidetector. The inclusive angular distributions are
approximately isotropic, consistent with multiple rescattering
in the target spectator. The multiplicity correlations of the
low-energy pions and of energetic protons (Ep >
150 MeV) with intermediate-mass fragments were determined
from the measured coincidence data. The deduced correlation
functions 1 + R ~ 1.3 for inclusive event samples reflect the
strong correlations evident from the common impact-parameter
dependence of the considered multiplicities. For narrow
impact-parameter bins (based on charged-particle multiplicity),
the correlation functions are close to unity and do not indicate
strong additional correlations. Only for pions at high particle
multiplicities (central collisions) a weak anticorrelation is
observed, probably due to a limited competition between these
emissions. Overall, the results are consistent with the
equilibrium assumption made in statistical multifragmentation
scenarios. Predictions obtained with intranuclear cascade models
coupled to the Statistical Multifragmentation Model are in good
agreement with the experimental data.
PACS numbers: 25.70.Mn, 25.70.Pq, 25.75.Dw, 25.75.Gz |
| Paper: |
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| Figures: |
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