München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 49: Kernphysik/Spektroskopie
HK 49.2: Gruppenbericht
Donnerstag, 23. März 2006, 17:30–18:00, C
Pre-equilibrium emission in 1.2 GeV proton induced reactions between Al and Th — •Frank Goldenbaum1, Claus-Michael Herbach2, Dietrich Hilscher2, Ulrich Jahnke2, V.G. Tishchenko2, Joel Galin3, Alain Letourneau3, Alain Peghaire3, Detlef Filges1, Ludwik Pienkowski4, Udo Schoeder5, and Jan Toke5 — 1Forschungszentrum Jülich gmbh, D-52428 Jülich — 2Hahn-Meitner Institut, D-14109 Berlin — 3GANIL, F-14076 Caen — 4Heavy Ion Laboratory, 02-093 Warszawa, Poland — 5Univ.Rochester, NY 14627 USA
Proton induced spallation reactions at 1.2 GeV incident energy with targets between Al and Th have been studied. Energy spectra and angular distributions for 1,2,3H, 3,4,6He, 6,7,8,9Li and 7,9,10Be isotopes have been measured and compared to results of intra-nuclear cascade and statistical model calculations. While the evaporation, mean excitation energy and linear momentum transfer is in good agreement with the data, pre-equilibrium emission cannot be accounted for in these simulations. For deuterons, pre-equilibrium emission is shown to be well described by surface coalescence while other mechanisms are required for 4He and heavier clusters.