DPG Phi
Verhandlungen
Verhandlungen
DPG

Erlangen 2001 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 43: Theorie VIII

HK 43.2: Gruppenbericht

Donnerstag, 22. März 2001, 15:00–15:30, B

Mid-rapidity charge distribution in peripheral heavy ion collisions — •Klaus Morawetz1,2, Pavel Lipavský3, Jacques Normand2, Daniel Cussol2, Jean Colin2, and Bernard Tamain21Max-Planck-Institute for the Physics of Complex Systems, Noethnitzer Str. 38, 01187 Dresden, Germany — 2LPC-ISMRA, Bld Marechal Juin, 14050 Caen, France — 3Institute of Physics, Academy of Sciences, Cukrovarnická 10, 16200 Praha 6, Czech Republic

The charge density distribution with respect to the velocity of matter produced in peripheral heavy ion reactions around Fermi energy is investigated [1]. The experimental finding of enhancement of mid-rapidity matter shows the necessity to include correlations beyond BUU which was performed in the framework of nonlocal kinetic theory [2] already applied to heavy ion collisions in [4,6]. This kinetic theory takes the finite duration and size of particle collision into account [3]. Different other theoretical improvements are discussed. While the in-medium cross section changes the number of collisions, it leads the transferred energy almost unchanged. In contrast the nonlocal scenario changes the energy transferred during collisions and leads to an enhancement of mid-rapidity matter. The renormalisation of quasiparticle energies can be included in nonlocal scenarios [5] and leads to a further enhancement of mid-rapidity matter distribution. This renormalisation is accompanied by a dynamical softening of the equation of state seen in longer oscillation periods of the excited compressional collective mode. We propose to include quasiparticle renormalisation by using the Pauli-rejected collisions which circumvent the problem of back-flows in Landau theory. Using the maximum relative velocity of projectile and target like fragments we associate experimental events with impact parameters of the simulations. For peripheral collisions we find a reasonable agreement between experiment and theory. For more central collisions the velocity damping is higher in one - body simulations than observed experimentally which is due to missing cluster formations in the used kinetic theory.
[1] K.  Morawetz, P. Lipavský, J. Normand, D. Cussol, J. Colin, B. Tamain, Phys. Rev. C, nucl-th/0011045 [2] V. Špička, P. Lipavský, and K. Morawetz, Phys. Lett. A 240, (1998), 160 [3] K. Morawetz, V. Spička, P. Lipavský, H.N. Kwong, Phys. Rev. C 59,6 (1999) 3052-3059 [4] K. Morawetz, V. Špička, P. Lipavský, G. Kortemeyer, Ch. Kuhrts, R. Nebauer, Phys. Rev. Lett. 82, (1999), 3767 [5] P. Lipavský, V. Spička, K. Morawetz, Phys. Rev. E 59 (1999) R1291-R1294 rap. comm. [6] K. Morawetz, Phys. Rev. C 62, (2000) 44606

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2001 > Erlangen