We present Hubble Space Telescope ACS deep photometry of the intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud .
By using this photometric dataset , we have determined the degree of ellipticity of the cluster ( \epsilon =0.14 \pm 0.03 ) and the radial density profile .
This profile is well reproduced by a standard King model with an extended core ( r _ { c } =24.5 ” ) and a low concentration ( c=1.16 ) , indicating that the cluster has not experienced the collapse of the core .

We also derived the cluster age , by using the Pisa Evolutionary Library ( PEL ) isochrones , with three different amount of overshooting ( namely , \Lambda _ { os } =0.0 , 0.10 and 0.25 ) .
From the comparison of the observed Color-Magnitude Diagram ( CMD ) and Main Sequence ( MS ) Luminosity Function ( LF ) with the theoretical isochrones and LFs , we find that only models with the inclusion of some overshooting ( \Lambda _ { os } =0.10-0.25 ) are able to reproduce the observables .
By using the magnitude difference \delta V _ { SGB } ^ { He - Cl } = 0.90 between the mean level of the He-clump and the flat region of the SGB , we derive an age \tau =1.4 \pm 0.2 Gyr .