Erlangen 2001 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 23: Kernphysik/Spektroskopie III - Reaktionen
HK 23.3: Group Report
Tuesday, March 20, 2001, 17:15–17:45, D
Decay of Excited Nuclei in Proton Induced Spallation Reactions — •C.-M. Herbach1, A. Böhm2, M. Enke1, D. Filges3, J. Galin2, F. Goldenbaum3, D. Hilscher1, U. Jahnke1, A. Letourneau2, B. Lott2, R.-D. Neef3, K. Nünighoff3, N. Paul3, A. Péghaire2, L. Pienkowski4, H. Schaal3, W.U. Schröder5, G. Sterzenbach3, V. Tishchenko1,6, and I. Töke5 — 1HMI Berlin — 2GANIL, France — 3FZ Jülich — 4Warsaw University, Poland — 5University of Rochester, USA — 6JINR, Dubna, Russia
The series of experiments at the Cooler Synchrotron COSY (Jülich) has been continued for a large number of spallation reactions p+X with protons of 0.8-2.5 GeV kinetic energy irradiating various thin targets (< 10 mg/cm2) from Al up to U. The exclusive data for neutrons and charged particles are measured event-wise with the 4π multi-detector array NESSI, which was supplemented by 6 telescopes consisting of two 80 µm and 1000 µm thick Si diodes backed by a 7 cm thick CsI crystal. Neutron multiplicity distributions as well as kinetic energy and angular distributions of light charged particles (LCPs) have been investigated as a function of thermal excitation energy E* of the composite systems.
Drastic discrepancies for LCP production are observed between experiment and some of the computer codes widely-used to simulate the spallation process.They are associated with too high E* calculated after the INC as well as different approaches for the Coulomb barriers and/or their dependence on E* in the employed evaporation codes. The pre-equilibrium emission studied up to 200 MeV for p, d, t and 3,4,6He is found to be an important source of composite particles.