Fusion using radioactive ion beams
A M VINODKUMAR
Department of Physics,
E-mail: attukalathil@gmail.com
Abstract. The
capture-fission cross-section is measured for the
collision of the massive nucleus
$^{132}$Sn with $^{96}$Zr
at
near-barrier energies and compared
with the collision of $^{124}$Sn
with $^{96}$Zr.
This study gives insight into fusion enhancement and
hindrance in systems involving
neutron-rich nuclei.
The dinuclear system model (DNS) calculations
describe the excitation function
reasonably well and if we use the
barrier heights predicted by this
model we can conclude that fusion
hindrance (represented by extra
push energy) is greater for the more
neutron-rich systems.
The fusion excitation function for $^{9}$Li
+ $^{70}$Zn and
$^{9}$Li + $^{208}$Pb systems are measured for near-barrier energies
using ISAC1 and ISAC2 Facilities at
TRIUMF. The $\alpha$-emitting
evaporation residues
($^{211-214}$At) are stopped in the $^{208}$Pb
target and their decay is
measured. The measured excitation
function shows evidence for large
enhancements in the sub-barrier
energies, which is not accounted by
current theoretical models.
Suppression of the above-barrier cross-section with respect
to these
theoretical models are also seen.
Keywords. Fusion; radioactive ion beams.
PACS Nos 25.70.Jj; 25.85.-2; 25.60.Pj