Abstract
It has been found that, in several nickel and zinc doubly even isotopes, a small number of levels are strongly and selectively excited at low energies by the ( 16O, 12C) α-transfer direct reaction, performed on iron and nickel targets near the Coulomb barrier. The behaviour of these states, together with calculations performed in the stretch scheme, strongly suggest that they involve a quartet structure, namely two protons and two neutrons in a highly symmetric configuration. The α-cluster model, which was successful in light nuclei, has now found a general and natural extension in medium-weight nuclei, in terms of quartet states which expresses the importance of four-nucleon correlations in nuclear structure.
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