Cross sections for the two-body channels populated in the 32 S+ 24 Mg reaction at E c . m . =60.8 MeV have been measured by use of a coincidence technique which allows correction for secondary lightparticle evaporation. The data show reaction yields with full equilibration of energy and massasymmetry coordinates. These results suggest an asymmetric fission mechanism and are contrary to what is expected from the previously proposed "orbiting" mechanism in light systems.
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The evolution of the / quasicontinuum spectrum with neutron number has been investigated in the sequence of isotopes ,52 < 154 > 156 £)y. The three nuclei display a pronounced collective E2 component. In l54 Dy this component shows a splitting into two distinct parts, signifying a structural change along the / cascade above the yrast line. The E2 and statistical components are reproduced in simple /-cascade calculations; in 152 Dy and 156 Dy only rotational bands are included, whereas in 154 Dy additional vibrationlike transitions are required to reproduce the two E2 peaks.
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