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 Negacyclic codes of length $8p^s$ over $\mathbb{F}_{p^m}+u\mathbb{F}_{p^m}$ Bull. Korean Math. Soc.Published online October 17, 2019 Chakkrid Klin-eam and Jirayu Phuto Faculty of Science, Naresuan University Abstract : Let $p$ be an odd prime. The algebraic structures of all negacyclic codes of length $8p^s$ over the finite commutative chain ring $\mathbb{F}_{p^m}+u\mathbb{F}_{p^m}$ where $u^2=0$ are studied in this paper. Moreover, we classify the structures into 5 cases: $p^m\equiv 1 \pmod{16}$, $p^m\equiv 3,11 \pmod{16}$, $p^m\equiv 5,13 \pmod{16}$, $p^m\equiv 7,15 \pmod{16}$ and $p^m\equiv 9 \pmod{16}$. From that, the structure of self-dual negacyclic codes, number of codewords of negacyclic codes are obtained. Keywords : negacyclic codes, finite chain rings, constacyclic codes, repeated-root codes MSC numbers : Primary 94B15, 94B05; Secondary 11T71 Full-Text :