Inne układy eksperymentalne: IGISOL CUDAC JANOSIK CUP Detektory Si BARRIERS ICARE EAGLE
REACTIONS WITH LIGHT NUCLEI
Andrzej Sołtan Institute of Nuclear Studies, ul. Hoża 69, 00-681 Warsaw, Poland
Institute of Nuclear Research, Prospect Nauki 47, 03680 Kiev, Ukraine
H.Niewodniczański Institute of Nuclear Physics, ul. Radzikowskiego 152,
31-342 Cracow, Poland
Kharkiv State University, 61077 Kharkiv, Ukraine
Heavy Ion Laboratory of Warsaw University, ul. Pasteura 5A, 02-093 Warsaw, Poland
Military University of Technology, ul. Kaliskiego 2, 00-908 Warsaw, Poland Contact: Krzysztof Rusek, Krzysztof.Rusek(at)fuw.edu.pl Nuclear reactions are the main source of experimental information on the structure of nuclei, mechanisms of nuclear processes and properties of nucleus-nucleus interaction. This information, for instance, may be obtained from the theoretical analysis of angular distributions of the measured reaction products. The present theoretical models used for such an analysis are parameterized, and the parameters describing nuclear structure, mechanisms of reactions and nucleus-nucleus interactions are closely related to each other. Therefore, for the reliable determination of these parameters a broad set of experimental data is demanded for reactions with different nuclei in the entrance and exit channels and at different energies. Thus, obtaining new experimental data remains an urgent task in nuclear physics. We perform experiments with the 10B3+, 11B2+, 12C2+, 14N3+ and 18O4+ ion beams, accelerated at Warsaw Cyclotron U-200P up to an energy of 5-10 MeV/A, which are scattered from the 6,7Li, 9Be, 12,13,14C targets. The experimentally obtained angular distributions of the reaction products are analyzed by means of the coupled-reaction-channels method, and the parameters describing the structure of the nuclei, mechanisms of nuclear reactions and nucleus-nucleus interactions are deduced. We start with the investigation of the elastic and inelastic scattering in order to obtain a reliable set of optical model parameters describing the nucleus-nucleus interaction in the entrance channel, which are then employed in the calculations of different transfer processes leading to the production of the experimentally observed nuclei in the exit reaction channels. EXPERIMENTAL SETUP "SYRENA" AT WARSAW CYCLOTRON
Figure 1: Scattering chamber of the experimental setup "SYRENA".
Figure 2: The scattering chamber in the inside. In Fig.3 a typical two-dimensional energy spectrum of the 7Li(12C,X) reaction products at Elab(12C) = 115 MeV registered at Θlab = 15o by the silicon ΔE-E spectrometer is shown. Very good energy resolution of the detectors leads to a good separations between Li, Be, B, C and N isotopes.
Figure 3: ΔE-E spectrum of the 7Li(12C,X) reaction products.
RESULTS OBTAINED USING THE BEAM FROM THE WARSAW CYCLOTRONSo far we have published five papers (see the list below). They contain new experimental data sets as well as many interesting conclusions drawn from the data analyses. As an example we present in Fig. 4 the angular distribution of the inelastically scattered 11B from 14C target leading to the excitation of the 7.012 MeV (2+) excited state of 14C. The curves present results of the coupled-channels calculations. Collective model of the target nucleus was assumed. The short dashed curve was obtained assuming the positive quadrupole deformation (β2 = +0.2) of 14C, while the solid curve was obtained with the negative quadrupole deformation (β2 = -0.2.).
Figure 4: The results of the calculations compared to the experimental data. BIBLIOGRAPHY(The experimental data obtained at Warsaw Cyclotron serves as the experimental material for four PhD theses as well as two DSc dissertations)
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