Large band gaps in radial phononic crystal structure with round mass block Nansha Gao, Jiu Hui Wu, Li Jing, Kuan Lu and Lie Yu Eur. Phys. J. Appl. Phys., 74 3 (2016) 30501 Published online: 24 June 2016 DOI: 10.1051/epjap/2016150592