Signature of shallow potentials in deep sub-barrier fusion reactions

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.034606· OSTI ID:20995138

Misicu, S; Esbensen, H ^[1]

---

1. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)

We extend a recent study that explained the steep falloff in the fusion cross section at energies far below the Coulomb barrier for the symmetric dinuclear system {sup 64}Ni+{sup 64}Ni to another symmetric system, {sup 58}Ni+{sup 58}Ni, and the asymmetric system {sup 64}Ni+{sup 100}Mo. In this scheme, the very sensitive dependence of the internal part of the nuclear potential on the nuclear equation of state determines a reduction of the classically allowed region for overlapping configurations and consequently a decrease in the fusion cross sections at bombarding energies far below the barrier. Within the coupled-channels method, including couplings to the low-lying 2{sup +} and 3{sup -} states in both target and projectile as well as mutual and two-phonon excitations of these states, we calculate and compare with the experimental data the fusion cross sections, S factors, and logarithmic derivatives for the above-mentioned systems and find good agreement with the data even at the lowest energies. We predict, in particular, a distinct double peaking in the S factor for the far sub-barrier fusion of {sup 58}Ni+{sup 58}Ni, which should be tested experimentally.

• OSTI ID: 20995138
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
COMPARATIVE EVALUATIONS
COULOMB FIELD
COUPLED CHANNEL THEORY
CROSS SECTIONS
ENERGY LEVELS
EQUATIONS OF STATE
EXCITATION
HEAVY ION FUSION REACTIONS
MASS NUMBER
MOLYBDENUM 100
NICKEL 58
NICKEL 64
NUCLEAR POTENTIAL
PHONONS