Correlated fluctuations in theY89(19F,x)y excitation functions

Abstract
Excitation functions have been measured for different fragments produced in the Y89 (19F,x)y reactions between 135 and 143.25 MeV incident energy in 250 keV steps. Cross section fluctuations correlated in atomic number and detection angle are observed with a coherence width of 200500 keV. Lifetimes have been deduced and are of the order of a complete nuclear rotation. The data can be explained in terms of quasimolecular configurations and/or an orbiting situation in a dinuclear system.