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: Postscript (874 kb) PDF (496 kb) 9 pages with 11 embedded figures
TeX Sources (only KP3 use)
Figures: Fig. 1a, 1b, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
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