Heavy ion fusion reactions

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5382695

Vandenbosch, R

There has been a renewed interest in fusion reactions in recent years, particularly at near-barrier and sub-barrier energies. Fusion at these energies is especially interesting because of the rich interplay between the dynamics of the reaction and the nuclear structure of the participating species. One-dimensional barrier penetration models fail to account for sub-barrier cross sections. The role of shape degrees of freedom and of transfer channels in enhancing the sub-barrier cross sections is explored. The importance of investigating the partial wave distribution of which the total fusion cross section is comprised is discussed. Various methods of probing this distribution are reviewed. New results obtained using fission fragment angular distributions are discussed. Comparisons with different models are made, and the evidence that the existing models underestimate the mean-square spin value will be presented. The dynamics of fusion reactions at higher energies are also discussed. A scenario based on a transition from dynamical limitations to a compound nuclear limitation and possibly back to a dynamical limitation with increasing energy is outlined. A novel effect associated with incomplete fusion which leads to the appearance of exceeding unitarity is mentioned. A way of looking at pre-equilibrium particle emission in terms of our understanding of damping in deeply inelastic collisions is presented. 59 refs., 27 figs.

• Research Organization: Washington Univ., Seattle (USA). Nuclear Physics Lab.
• DOE Contract Number: AC06-81ER40048
• OSTI ID: 5382695
• Report Number(s): DOE/ER/40048-172-L6; CONF-8606208-1; ON: DE86015052
• Country of Publication: United States
• Language: English

Related Subjects

651000* -- Nuclear Physics
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
COUPLED CHANNEL THEORY
CROSS SECTIONS
DECAY
DEEP INELASTIC SCATTERING
DEFORMED NUCLEI
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
EMISSION
ENERGY
EXCITATION FUNCTIONS
FISSION
FISSION FRAGMENTS
FUNCTIONS
HEAVY ION FUSION REACTIONS
INELASTIC SCATTERING
INTERACTIONS
KINETIC ENERGY
KINETICS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
MULTIPLICITY
NEUTRON EMISSION
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
ORBITAL ANGULAR MOMENTUM
PARTIAL WAVES
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
POTENTIALS
REACTION KINETICS
SCATTERING
SPIN
SPONTANEOUS FISSION
TIME DEPENDENCE