81 research outputs found
Experimental Setups for Single Event Effect Studies
Experimental setups are being prepared to test and to qualify electronic devices regarding their tolerance to Single Event Effect (SEE). A multiple test setup and a new beam line developed especially for SEE studies at the São Paulo 8 UD Pelletron accelerator were prepared. This accelerator produces proton beams and heavy ion beams up to 107Ag. A Super conducting Linear accelerator, which is under construction, may fulfill all of the European Space Agency requirements to qualify electronic components for SEE
No evidence of break-up effects on the fusion of 9Be with medium-light nuclei
AbstractFusion cross sections were measured for the 9Be+27Al and 19F+9Be, 12C systems, at energies above the Coulomb barrier, in order to investigate the possible effect of fusion hindrance due to the break-up of the weakly bound nuclei. Comparisons with one-dimensional barrier penetration models and with other similar systems, where no break-up is expected to occur, show no evidence of fusion hindrance
Stopping power of Au for silver ions at low velocities
Energy loss measurements for the slowing down of Ag ions in Au, in the velocity range 1:6v0 < v < 4:4v0, where v0 is the Bohr velocity, are presented. The measurements were performed using the Doppler shift technique and also with a new method, where a secondary beam of low velocity heavy ions is produced by elastic scattering of the accelerated beam. The results are compared to the SRIM2000 calculations (www.srim.org) and to recent measurements in this velocity region
Effect of the break-up on the fusion and elastic scattering of weakly bound projectiles on Zn
We study the behavior of the fusion, break-up, reaction and elastic
scattering of different projectiles on Zn, at near and above barrier
energies. We present fusion and elastic scattering data with the tightly bound
O and the stable weakly bound Li, Li and Be
projectiles. The data were analyzed by coupled channel calculations. The total
fusion cross sections for these systems are not affected by the break-up
process at energies above the barrier. The elastic (non-capture) break-up cross
section is important at energies close and above the Coulomb barrier and
increases the reaction cross sections. In addition we also show that the
break-up process at near and sub-barrier energies is responsible for the
vanishing of the usual threshold anomaly of the optical potential and give rise
to a new type of anomaly.Comment: 24 pages, 10 figure
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