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We report on results of observation of the focusing effect from the planes(220) of Gallium Arsenide (GaAs) crystals. We have compared the experimentalresults with the simulations of the focusing capability of GaAs tiles through adeveloped Monte Carlo. The GaAs tiles were bent using a lapping processdeveloped at the cnr/imem - Parma (Italy) in the framework of the laue project,funded by ASI, dedicated to build a broad band Laue lens prototype forastrophysical applications in the hard X-/soft gamma-ray energy range (80-600keV). We present and discuss the results obtained from their characterization,mainly in terms of focusing capability. Bent crystals will significantlyincrease the signal to noise ratio of a telescope based on a Laue lens,consequently leading to an unprecedented enhancement of sensitivity withrespect to the present non focusing instrumentation.

Focusing effect of bent GaAs crystals for gamma-ray Laue lenses: Monte Carlo and experimental results