Non-statistical fluctuations for deep inelastic processes in 27Al + 27Al

摘要

The excitation functions for different fragments produced in the 27Al + 27Aldissipative collisions have been measured in steps of 250 keV in the energyrange 122 - 132 MeV. Deep inelastic processes have been selected by integratingevents over a total kinetic energy loss window of 12 MeV between 20 and 32 MeV.Large fluctuations have been observed in all the studied excitation functions.Non-satistical origin of these fluctuations is confirmed by large channel crosscorrelations coefficients. Energy autocorrelation function of cross sectionexcitation function presents damped oscillation structure as predicted for thecase when a di-nuclear system with a lifetime similar with its revolutionperiod is formed. The periodicity of the energy autocorrelation function isused to obtain information on the deformation of the 27Al + 27 Al di-nucleus.