Fusion hindrance for Al27+Sc45 and other systems with a positive Q value
Abstract
Fusion evaporation cross sections for the Al27+Sc45 (Q=9.63 MeV) system are measured down to about 300 nb. Deviations from standard coupled-channels calculations were observed in this system at the lowest energies. The steep fall-off of the fusion cross sections can be reproduced by calculations using a shallow potential model, which was originally developed to explain the hindrance behavior of heavy-ion fusion in medium-mass systems with negative Q values. Comparisons of the hindrance behavior between the present experiment and other systems, for example, Si28+Si30 (Q=14.3 MeV) and S36+Ca48 (Q=7.55 MeV) are presented.
- Publication:
-
Physical Review C
- Pub Date:
- February 2010
- DOI:
- 10.1103/PhysRevC.81.024611
- Bibcode:
- 2010PhRvC..81b4611J
- Keywords:
-
- 25.70.Jj;
- 26.20.Np;
- 24.10.Eq;
- 24.10.Ht;
- Fusion and fusion-fission reactions;
- Nucleosynthesis in late stellar evolution;
- Coupled-channel and distorted-wave models;
- Optical and diffraction models