Fully differential (e,3e) cross sections for electron impact double ionization of helium in the keV regime A.S. Kheifets$^\star$, I. Bray$^\ast$, A. Lahmam-Bennani$^\dagger$, A. Duguet$^\dagger$ and I. Taouil$^\dagger$, $^\star$ RSPhysSE, Australian National University, Canberra A.C.T. 0200, Australia. $^\sharp$ESM Centre, Flinders University of South Australia, GPO Box 2100, Adelaide S.A. 5001, Australia $^\dagger$Laboratoire des Collisions Atomiques et Mol\'{e}culaires, Bat. 351, Universit\'{e} de Paris-Sud 91405 Orsay Cedex, France We determine, both experimentally and theoretically, the fully-resolved cross-section of the double ionization of helium by 5.5~keV electron impact. Two electrons are ejected in the continuum with energies $E_1$=$E_2$=4 and 10~eV. Calculations are performed using the convergent close-coupling (CCC) method which treats the interaction between the two slow ejected electrons to infinite order. The interaction of the fast incident electron with the target is described within the 1st Born approximation.