Universality of Spectator Fragmentation at Relativistic Bombarding
Energies
Universality of Spectator Fragmentation at Relativistic Bombarding
Energies| Authors: | A. Schüttauf, W.D. Kunze, A. Wörner, M. Begemann-Blaich, Th. Blaich, D.R. Bowman, R.J. Charity, A. Cosmo, A. Ferrero, C.K. Gelbke, C. Gross, W.C. Hsi, J. Hubele, G. Imme, I. Iori, J. Kempter, P. Kreutz, G.J. Kunde, V. Lindenstruth, M.A. Lisa, W.G. Lynch, U. Lynen, M. Mang, T. Möhlenkamp, A. Moroni, W.F.J. Müller, M. Neumann, B. Ocker, C.A. Ogilvie, G.F. Peaslee, J. Pochodzalla, G. Raciti, F. Rosenberger, Th. Rubehn, H. Sann, C. Schwarz, W. Seidel, V. Serfling, L.G. Sobotka, J. Stroth, L. Stuttge, S. Tomasevic, W. Trautmann, A. Trzcinski, M. B. Tsang, A. Tucholski, G. Verde, C.W. Williams, E. Zude, and B. Zwieglinski |
| Published: |
Nucl. Phys. A607(1996)457
[->Spires]
Preprint GSI-96-26, June 1996 Preprint nucl-ex/9606001 |
| Abstract: |
Multi-fragment decays of 129Xe, 197Au, and
238U projectiles in collisions with Be, C, Al, Cu, In,
Au, and U targets at energies between E/A = 400 MeV and 1000 MeV
have been studied with the ALADIN forward-spectrometer at SIS. By
adding an array of 84 Si-CsI(Tl) telescopes the solid-angle coverage
of the setup was extended to \thetalab = 16°. This
permitted the complete detection of fragments from the
projectile-spectator source.
The dominant feature of the systematic set of data is the Zbound universality that is obeyed by the fragment multiplicities and correlations. These observables are invariant with respect to the entrance channel if plotted as a function of Zbound, where Zbound is the sum of the atomic numbers Zi of all projectile fragments with Zi <= 2. No significant dependence on the bombarding energy nor on the target mass is observed. The dependence of the fragment multiplicity on the projectile mass follows a linear scaling law. The reasons for and the limits of the observed universality of spectator fragmentation are explored within the realm of the available data and with model studies. It is found that the universal properties should persist up to much higher bombarding energies than explored in this work and that they are consistent with universal features exhibited by the intranuclear cascade and statistical multifragmentation models. |
| Paper: |
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