Abstract
Conventional coupled-channels analyses, that take account of only the collective excitations of the colliding nuclei, have failed to reproduce the different behavior of the experimental quasi-elastic barrier distributions for the ${}^{20}$Ne+${}^{90,92}$Zr systems. To clarify the origins of this difference, we investigate the effect of noncollective excitations of the Zr isotopes. Describing these excitations in a random-matrix model, we explicitly take them into account in our coupled-channels calculations. The noncollective excitations are capable of reproducing the observed smearing of the peak structure in the barrier distribution for ${}^{20}$Ne+${}^{92}$Zr, while not significantly altering the structure observed in the ${}^{20}$Ne+${}^{90}$Zr system. The difference is essentially related to the closed neutron shell in ${}^{90}$Zr.
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