On the Depth Distribution of Constacyclic Codes over Z₄ of Length 2^e

In this paper, we consider the depth distribution of constacyclic codes over Z₄ with length even prime power. The depth distribution of negacyclic codes over Z₄ of length 2^e is completely determined. Furthermore, we determine the depth spectrum of cycilc codes over Z₄ of length 2^e, and the depth distribution of some cyclic codes over Z₄ of length 2^e is also given.