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- Timestamp:
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May 20, 2011, 5:42:32 PM (13 years ago)
- Author:
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mosel
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| 6 | 6 | From then on a number of very good young scientists have worked on it. '''Wolfgang Cassing''' joined the effort at this point. First, '''Koji Niita''' (Japan) rewrote again large parts of the code and implemented pion production, photon production and a good description of the nuclear ground state, '''Angel de Paoli''' and '''Gustavo Batko''' (both Argentina) used it to calculate etas and kaons produced in heavy-ion collisions and '''Gyuri Wolf''' (Hungary) did a series of important early papers on dilepton production in heavy ion reactions which provided some of the motivation for the construction of HADES, the dilepton spectrometer at GSI. Very early on, a parallel development to construct a manifestly covariant BUU code was started. Giessen PhD students '''Volker Koch''' and '''Bernhard Blaettel''' wrote the first such code and used it to analyse BEVALAC cata on flow and particle production (1990). '''Klaus Weber''' in his thesis (1992) did work on a covariant description of the momentum dependence of the mean field at high energies, where the Walecka model becomes too repulsive. '''Tomoyuki Maruyama''' (Japan) followed up on this and did the first numerical implementation of an explicit momentum dependence that corrects this deficiency of the Walecka model at high energies. Giessen PhD student '''Andreas Lang''' performed the first thermal analysis of heavy-ion reactions with this code; he analyzed the degree of equilibration during heavy-ion collisions and showed that full equilibration is reached on in the latest stages of a collision when the nuclear density has already decreased below its equilibrium value. Another Giessen PhD student, '''Stefan Teis''', then did a very complete analysis of pion and eta production in heavy-ion collisions measured by the TAPS group at GSI (1997). He also analyzed the antiprotons and very-high energy pions produced in such reactions. At about this time, diploma student '''Alexander Hombach''' did the very first application of a BUU calculation to photon-induced reactions on a nucleus, analyzing the eta-production data obtained by the TAPS group at MAMI. Alexander Hombach, in his PhD thesis, did a corresponding detailed analysis of flow observables in such collisions. Teis, together with another PhD student, '''Martin Effenberger''', rewrote parts of the code and implemented significantly more resonance excitations into the code. At roughly the same time (1998), PhD student '''Jochen Geiss''', applied the earlier version of the code to an analysis of ultrarelativistic heavy-ion collisions, in particular to the problem of production of strangeness and charmonium in such collisions; the interest in these questions is still alive today. |
| 7 | 7 | |
| 8 | | At this point, as a spin-off the HSD project was established, focusing on High Energy Heavy-Ion Collisions. This project is maintained by W.Cassing and E.Bratkovskaya totally detached from |
| | 8 | At this point, as a spin-off the HSD project was established, focusing on High Energy Heavy-Ion Collisions. This project is maintained by W.Cassing and E.Bratkovskaya totally detached from the following development (cf. its [http://th.physik.uni-frankfurt.de/~brat/hsd.html website] for details.). |
| 9 | 9 | |
| 10 | 10 | Starting with the work of Hombach and Effenberger the code was applied to elementary collisions on a nucleus, as e.g. of photon- and pion-induced reactions. Effenberger, in his thesis, showed the first grand predictions for photon-nucleus collisions leading to dileptons. He also did the first high-energy calculations with photons where shadowing becomes important. In the following years |
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