2-nucleon, 3-nucleon and 4-nucleon Transfer, Doorways To Fusion

Near-barrier differential cross sections of the prominent transfer channels in the systems S-33, Zr-90, Zr-91, Zr-93 and S-32 , Ru-100, Ru-101 have been measured including Q-distributions. The relatively large 2-,3- and 4-nucleon transfer cross sections suggest their contribution to the observed fusion enhancements. The angular distributions are discussed within the frame work of a simple semiclassical formalism and some interesting connections to fusion are revealed

Correlations between nucleon transfer and fusion at near-barrier energies for the systems32S +100,101Ru and33S +90,91,92Zr

Transfer reactions at two near-barrier energies for the systems32S +100,101Ru have been studied. Differential cross sections have been extracted for a large variety of channels, with a set-up yielding good mass, nuclear charge and energy resolutions. A steeper decrease of the measured angular distributions at backward angles with respect to the prediction of a semiclassical theory is interpreted as a loss of transfer flux feeding more complex channels and/or fusion. Coupled channels calculations, which use the transfer form factors derived from the experiment, reproduce the fusion cross sections at sub-barrier energies. Multi-nucleon transfer seems to play an essential role for the fusion process, as evidenced by the found strong correlations. A systematic comparison is made with the systems33S +90,91,92Zr, which have been the object of a previous experimental study with the same set-up

Shell effects in superdeformed minima

Recent and planned experiments aiming at the observation of the direct links between superdeformed and normal-deformed structures in the A∼ - 190 mass region may offer unique information on the absolute nuclear binding energy in the 2:1 minima, and hence on the magnitude of shell effects in the superdeformed well. In the present paper, the self-consistent mean-field theory with density-dependent pairing interaction is used to explain at the same time the two-particle separation energies in the first and second wells, and the excitation energies of superdeformed states in the A ∼ 190 and A ∼ 240 mass regions.SCOPUS: ar.jinfo:eu-repo/semantics/publishe