22 research outputs found
Experimental Realization of the Fuse Model of Crack Formation
In this work, we present an experimental investigation of the fuse model. Our
main goal was to study the influence of the disorder on the fracture process.
The experimental apparatus used consisted of an square lattice with
fuses placed on each bond of the lattice. Two types of materials were used as
fuses: copper and steel wool wires. The lattice composed only by copper wires
varied from a weakly disordered system to a strongly disordered one. The
lattice formed only by steel wool wires corresponded to a strongly disordered
one. The experimental procedure consisted of applying a potential difference V
to the lattice and measuring the respective current I. The characteristic
function obtained was investigated in order to find the scaling law
dependence of the voltage and the current on the system size when the
disorder was changed. Our results show that the scaling laws are only verified
for the disordered regime.Comment: 4 pages, 8 figures.ep
Complete Fusion Enhancement and Suppression of Weakly Bound Nuclei at Near Barrier Energies
We consider the influence of breakup channels on the complete fusion of
weakly bound systems in terms of dynamic polarization potentials. It is argued
that the enhancement of the cross section at sub-barrier energies may be
consistent with recent experimental observations that nucleon transfer, often
leading to breakup, is dominant compared to direct breakup. The main trends of
the experimental complete fusion cross section for Li + Bi are
analyzed in the framework of the DPP approach.Comment: 12 pages, 2 figure
Influência do espaçamento nas características energéticas de espécies arbóreas em plantios de curta rotação
Investigation of breakup effects on
The effect of the breakup of the weakly bound 6Li projectile on the elastic channel of the
6Li144Sm
system is investigated. CDCC calculations are performed by explicitly taking into account the breakup channel and are compared with very precise elastic scattering angular distributions around the Coulomb barrier. The breakup effect is to produce a repulsive polarization potential