Existence of a one-body barrier revealed in deep subbarrier fusion

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

DOI:https://doi.org/10.1103/PHYSREVC.75.057603· OSTI ID:20995348

Ichikawa, Takatoshi ^[1]; Hagino, Kouichi ^[2]; Iwamoto, Akira ^[3]

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1. RIKEN Nishina Center, RIKEN, Wako, Saitama 351-0198 (Japan)
2. Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
3. Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195 (Japan)

Based on the adiabatic picture for heavy-ion reactions, in which the neck formation in the one-body system is taken into account, we propose a two-step model for fusion cross sections at deep sub-barrier energies. This model consists of the capture process in the two-body potential pocket, which is followed by the penetration of the adiabatic one-body potential to reach a compound state after the touching configuration. We describe the former process with the coupled-channels framework, while the latter with the Wentzel-Kramers-Brillouin (WKB) approximation by taking into account the coordinate dependent inertia mass. The effect of the one-body barrier is important at incident energies below the potential energy at the touching configuration. We show that this model well accounts for the steep fall-off phenomenon of fusion cross sections at deep sub-barrier energies for the {sup 64}Ni+{sup 64}Ni and {sup 58}Ni+{sup 58}Ni reactions.

• OSTI ID: 20995348
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CONFIGURATION
COUPLED CHANNEL THEORY
CROSS SECTIONS
HEAVY ION REACTIONS
MOMENT OF INERTIA
NICKEL 58
NICKEL 64
POTENTIAL ENERGY
POTENTIALS
TWO-BODY PROBLEM
WKB APPROXIMATION