  Comprehensive set of shell model calculations for $^{78-84}$Se isotopes have
been performed with recently derived interactions, namely JUN45 and jj44b for
${f_{5/2}pg_{9/2}}$ space. To study the importance of the proton excitations
across Z=28 shell in this region mentioned by Cheal {\it et al.} [Phys. Rev.
Lett. {\bf104}, 252502 (2010)], calculation for ${fpg_{9/2}}$ valence space
using an ${fpg}$ effective interaction with $^{48}$Ca as core and imposing a
truncation has also been performed. Comparison of the calculations with
experimental data show that the predicted results of jj44b interaction are in
good agreement with experimental data.
