Heavy-ion fusion at low energies |
| |
Authors: | Neil Rowley |
| |
Institution: | (1) Institut de Recherches Subatomiques, 23 rue du Loess, F67037 Strasbourg Cedex 2, France |
| |
Abstract: | Through precision measurements of fusion cross sections at energies close to the Coulomb barrier and through the application
of the method of “experimental barrier distributions” which these permit, many recent advances have been made in our understanding
of the dynamical processes occurring during a heavy-ion collision. It is now clear that the target and projectile reach one
another in superpositions of states which correspond to different orientations for rotational nuclei or to different induced
deformations for vibrational nuclei. The creation of a neck of neutron matter has also long been postulated and by studying
the isotopic dependence of the fusion reaction, some recent results in the 10Ca+90,96Zr systems appear to confirm this result. For large Z
1
Z
2 a type of extra-push effect can arise from the same inelastic entrance-channel effects which enhance the fusion of lighter
systems, though this will be absent in cases where the enhancement arises from neutron transfers.
The existence of different barriers will of course influence all other reaction channels. Fusion simply allows one to visualise
the barriers most easily, since for this process, the total cross section is an incoherent sum of the contributions from all relevant eigenchannels. Some effects in other channels have already been observed. Other
possible effects will be discussed. These include; the exploitation of the lowest-energy barrier to produce exotic evaporation
residues and strongly deformed high-spin states at low excitation energy. |
| |
Keywords: | Fusion barrier-distributions exotic nuclei deformed high-spin states |
本文献已被 SpringerLink 等数据库收录! |
|