Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 43: Kernphysik/Spektroskopie VI
HK 43.1: Gruppenbericht
Donnerstag, 20. März 2003, 16:30–17:00, A
Composite Particle Emission in GeV-Proton Induced Spallation Reactions - Investigated with the NESSI-Detector at COSY — •C.-M. Herbach1, D. Hilscher1, U. Jahnke1, V. Tishchenko1,2, J. Galin3, A. Letourneau3, A. Péghaire3, D. Filges4, F. Goldenbaum4, K. Nünighoff4, N. Paul4, H. Schaal4, G. Sterzenbach4, L. Pienkowski5, W.U. Schröder6, and J. Töke6 — 1HMI Berlin — 2JINR, Dubna, Russia — 3GANIL, France — 4FZ Jülich — 5Warsaw University, Poland — 6University of Rochester, USA
The emission of composite particles in GeV-proton induced spallation reactions has so far not been thoroughly studied experimentally. More detailed data, however, are required for a better modelling of these reactions, in particular, as to the pre-equilibrium phase. The NESSI detector system, a combination of two 4π-detectors for neutrons and charged particles, has been supplemented by 6 fourfold ΔE-E telescopes to provide the data needed as a function of thermal excitation energy. The telescopes consist of 3 silicon detectors (25, 80 and 1000 µm) backed by a 7 cm long CsI crystal and allow for identification of 1,2,3H, 3,4,6He, 6,7,8,9Li, 7,9,10Be, and 10,11B with mass resolution of ΔA ≤ 0.2 amu for E/A> 3.5 MeV/A and ΔA ≤ 0.4 for E/A < 3.5 MeV/A. Their dynamical range (1.5 to 200 MeV/A) covers almost completely the particle energies both for the evaporation and the pre-equilibrium regime of the reaction. First results from the reaction p(2.5GeV)+Au has been published recently[1]. This contribution presents new systematic data for various target nuclei from Al up to U and incident proton energies of 0.8 to 2.5 GeV.
[1] A. Letourneau et al., NPA 712(2002)113