A case study of collectivity, transfer and fusion enhancement

H. Timmersa, D. Ackermanna, S. Beghinib, L. Corradia, J. H. Hea, G. Montagnolib, F. Scarlassarab, A. M.
Stefaninia and N. Rowleyc

a INFN, Laboratori Nazionali di Legnaro Legnaro (PD), Italy
b Università di Padova and INFN Sezione di Padova Padova, Italy
c Institut de Recherches Subatomiques, 23 Rue du Loess F-67037 Strasbourg Cedex 2, France

Nuclear Physics A Volume 633, Issue 3, 20 April 1998, Pages 421 - 445

A pdf-file of the paper can be found here (1060 kB) .

Abstract

Precise fusion and quasi-elastic scattering excitation functions have been measured for the systems 40Ca + 90,96Zr at energies spanning the Coulomb barrier. From
both the fusion and the quasi-elastic scattering data representations of the barrier distributions have been extracted. The barrier distributions of the two reactions are
qualitatively very different. While the lighter system is well described by coupled-channels calculations including multi-phonon excitations, this coupling scheme fails
completely for the heavier system, possibly due to multi-neutron transfer.

Author Keywords: Nuclear reactions 90,96Zr(40Ca,X), E = 124 - 160 MeV; Measured fusion excitation functions, quasi-elastic scattering excitation functions;
Deduced representations of barrier distributions; Subbarrier fusion, coupled-channels calculations, double phonon excitations, neutron-flow, neck-formation

PACS classification codes: 25.70; 25.70.J; 25.30