ever, that a judicious mixture, with some quadrupole radiation would yield satisfactory results.Of the methods used to predict the number and energy of the p rays emitted, the most successful was the equation of Strutinsky. " The assignment of a constant p-ray energy of 1.5 MeV was not successful.Kiefer' found the constant-energy p-ray assumption was adequate in fitting his experimental data. The present work extends to considerably higher excitation energies and it is at high energies that this assumption proves inadequate. The two methods used for assignment of neutron energies predicted approxi-mately the same total de-excitation and the calculation results were in good agreement.
Excitation functions for the 180(p, n)lSF reaction were measured at bombarding energies Ep=4.6 to 6.6 MeV. In and near two resonances of the yield curves at Ep-----5.622 and 6.061 MeV, angular distributions were measured with neutron timeof-flight techniques. The strong neutron decay to the T= 1 state in 18F and the similarity of the 1SO(p, n) and 180(n, n) yield curves give good evidence that the structures in the 180(p, n) yield curve arise from the formation of T= 3/2 states in 19F. A twolevel-analysis does not give satisfactory fits to the strongly asymmetric angular distributions.
Search for Intermediate Substructures in the Fission Cross Section of 232Th~-nThe resonances in the 232Th(n,f) reaction at En=l.61 and 1.72MeV were examined for fine structure. With the experimental resolution of 8 keV no resolved fine structure was observed.Im Wirkungsquerschnitt ffir neutroneninduzierte Spaltung finden sich bei einigen schweren Kernen unterhalb der Spaltschwelle aus-gepr~igte Resonanzstrukturen mit Halbwertbreiten yon etwa 100 bis 200 keV. Diese Grobstrukturen wurden gedeutet als Anregung kollektiver/~-Vibrationszust/inde im sog. zweiten Minimum der doppelh6ckerigen Spaltungsbarriere 1, wie sie yon Strutinski 2 vorgeschlagen worden ist. In einer Beschreibung des Spaltungsvorgangs spielen/?-Vibrationen eine exponierte Rolle. Je nach der Intensit~it der Kopplung an andere Freiheitsgrade k6nnen die /%Vibrationszust~inde mit den Compoundkernzustfmden im zweiten Minimum mischen oder nicht und gegebenenfalls zu Substrukturen AnlaB geben. Eine genauere Analyse dieser Strukturen lfiBt Rfickschlfisse auf die spezifischen Parameter der doppel-h6ckerigen Spaltungsbarriere zu.Hochaufl6sende Untersuchungen von solchen intermedi~iren Strukturen wurden bisher durchgef~hrt bei den Reaktionen 239pu(d, pf) (18 keV) 3, 23~ (5 keV) 4 und 236U(n,f) (8 keV)5. Die experimen-1 Lynn,
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