Abstract
In this paper, we introduce a hemi-slant submanifold of a 3-Sasakian manifold. First, we obtain some new results in terms of the operators T-i and f(i). By using Gauss, Codazzi and Ricci equations, we prove some results involving Ricci and scalar curvatures by using the slant angle and the mean curvature vector of the submanifold.