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HK: Physik der Hadronen und Kerne
HK 43: Theorie VIII
HK 43.5: Talk
Thursday, March 22, 2001, 16:15–16:30, B
Production of hypernuclei via hadronic reactions — •Simona Briganti and Horst Lenske — Institut für Theoretische Physik, Universität Giessen, Deutschland
In the description of hadronic reactions leading to the production of
Lambda
hypernuclei (e.g. A(π+,K+)ΛA,
A(K−,π−)ΛA), initial and final state
interaction must be taken into account.
In order to obtain realistic wave functions for the incoming and outgoing
mesons the elastic scattering of pions and kaons on
nuclei is investigated.
The incident momenta considered for the pion beam are in the range
of 600 MeV/c <plab < 900 MeV/c, those for the kaon beam
are
in the range of
600 MeV/c <plab < 800 MeV/c; the target nucleus is
12C.
The calculations have been performed in the framework of the eikonal
approximation; the optical potential used is given by the tρ
approximation.
The agreement between the calculated and the experimental angular
distributions is in general good, even if the theoretical curves tend to
lay
below the data. The possible role of the 1st order non-eikonal correction
in
reducing this discrepancy has been investigated. Our finding is that the
effect of this correction is very small, and mostly affects the depth of
the
diffraction minima.
In order to improve the agreement between theory and experiment a
substantial
renormalization of both the real and imaginary part of the meson-nucleon
scattering amplitude (that constitute part of the input for the optical
potential) is needed.
Supported by DFG.