Experimental barrier distributions for the fusion ofandwithand coupled-channels analyses
- 20 November 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review C
- Vol. 64 (6), 064608
- https://doi.org/10.1103/physrevc.64.064608
Abstract
Precise excitation functions for the fusion of and on were measured for bombarding energies spanning the Coulomb barrier regions. Experimental fusion barrier distributions were derived from these data and compared with the results of realistic coupled-channels calculations, which included couplings to all orders and treated excitation energies correctly. To gain reasonable agreement for the heavier projectiles it was necessary to include double-phonon excitations of the first and vibrational states in The diffuseness parameter required to fit the high-energy cross sections increases with increasing charge of the projectile and, as found in earlier work, is higher than that required to fit elastic-scattering data. It is suggested that a potential which falls more rapidly at large distance than the Woods-Saxon form might help explain the anomaly.
Keywords
This publication has 44 references indexed in Scilit:
- A program for coupled-channel calculations with all order couplings for heavy-ion fusion reactionsComputer Physics Communications, 1999
- Role of Anharmonicities of Nuclear Vibrations in Fusion Reactions at Sub-barrier EnergiesPhysical Review Letters, 1997
- Nuclear Ground-State Masses and DeformationsAtomic Data and Nuclear Data Tables, 1995
- Strong dependence of sub-barrier fusion on the nuclear hexadecapole deformationPhysics Letters B, 1993
- On the “distribution of barriers” interpretation of heavy-ion fusionPhysics Letters B, 1991
- CCDEF - A simplified coupled-channel code for fusion cross sections including static nuclear deformationsComputer Physics Communications, 1989
- Reduced electric-octupole transition probabilities, B(E3;01+ → 31−), for even-even nuclides throughout the periodic tableAtomic Data and Nuclear Data Tables, 1989
- CCFUS — A simplified coupled-channel code for calculation of fusion cross sections in heavy-ion reactionsComputer Physics Communications, 1987
- Transition probability, B(E2)↑, from the ground to the first-excited 2+ state of even-even nuclidesAtomic Data and Nuclear Data Tables, 1987
- Estimate of enhancements in sub-barrier heavy-ion fusion cross sections due to coupling to inelastic and transfer reaction channelsPhysics Letters B, 1983