Threshold anomaly in C-12+Bi-209 scattering - art. no. 034611

Citation
S. Santra et al., Threshold anomaly in C-12+Bi-209 scattering - art. no. 034611, PHYS REV C, 6003(3), 1999, pp. 4611
Citations number
37
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C-NUCLEAR PHYSICS
ISSN journal
0556-2813 → ACNP
Volume
6003
Issue
3
Year of publication
1999
Database
ISI
SICI code
0556-2813(199909)6003:3<4611:TAICS->2.0.ZU;2-J
Abstract
Elastic scattering angular distributions have been measured for the system C-12+Bi-209 at ten energies between 58.9 to 87.4 MeV. Optical model analysi s of these, together with existing data at 118 MeV, using both phenomenolog ical and microscopic models, shows a pronounced energy dependence of the op tical potential. Fusion cross sections have been deduced, by a barrier pene tration model and by subtracting the direct reaction contributions from the reaction cross sections. Threshold anomaly of the optical potential has be en explained both by dispersion relation and by coupled reaction channel (C RC) calculations. The CRC calculations, including inelastic excitation and transfer channels, reproduce simultaneously the elastic, inelastic, and tra nsfer angular distributions measured at 61.9, 63.9, and 87.3 MeV. Compariso n of threshold anomaly results for He-4, B-11, O-16+ Bi-209 systems along w ith the present case indicates that the degree of anomaly increases with th e projectile mass. [S0556-2813(99)05805-2].