196 research outputs found
Production of multi-strangeness hypernuclei and the YN-interaction
We investigate for the first time the influence of hyperon-nucleon (YN)
interaction models on the strangeness dynamics of antiproton- and -nucleus
interactions. Of particular interest is the formation of bound
multi-strangeness hypermatter in reactions relevant for \panda. The main
features of two well-established microscopic approaches for YN-scattering are
first discussed and their results are then analysed such that they can be
applied in transport-theoretical simulations. The transport calculations for
reactions induced by antiproton beams on a primary target including also the
secondary cascade beams on a secondary target show a strong sensitivity on the
underlying YN-interaction. In particular, we predict the formation of
-hypernuclei with an observable sensitivity on the underlying
N-interaction. We conclude the importance of our studies for the
forthcoming research plans at FAIR.Comment: 13 pages, 5 figures. Accepted for publication in Physics Letters
Thermodynamical description of heavy ion collisions
We analyze the thermodynamical state of nuclear matter in transport
descriptions of heavy ion reactions. We determine thermodynamical variables
from an analysis of local momentum space distributions and compare to blast
model parameters from an analysis of fragment energy spectra. These
descriptions are applied to spectator and fireball matter in semi-central and
central Au+Au collisions at SIS-energies, respectively.Comment: 4 pages, 2 postscript-figures, to be published in the proceedings of
Bologna2000: Structure of the Nucleus at the Dawn of the Century, Bologna,
Italy, 29 May - 3 Jun 200
Isospin dependent kaon and antikaon optical potentials in dense hadronic matter
Isospin effects on the optical potentials of kaons and antikaons in dense
hadronic matter are investigated using a chiral SU(3) model. These effects are
important for asymmetric heavy ion collision experiments. In the present work
the dispersion relations are derived for kaons and antikaons, compatible with
the low energy scattering data, within our model approach. The relations result
from the kaonic interactions with the nucleons, vector mesons and scalar mesons
in the asymmetric nuclear matter. The isospin asymmetry effects arising from
the interactions with the vector-isovector - meson as well as the scalar
isovector mesons are considered. The density dependence of the isospin
asymmetry is seen to be appreciable for the kaon and antikaon optical
potentials. This can be particularly relevant for the future accelerator
facility FAIR at GSI, where experiments using neutron rich beams are planned to
be used in the study of compressed baryonic matter.Comment: 21 pages, 7 figure
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