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A nuclear spectroscopic study of the high-spin ground state of Np (I =5+) showed substantial differences from earlier work. The sources, prepared by the "'U(a, pn) and '~Pu(n, p4n) reactions, were chemically separated and purified. A total of 34 y rays (139. 9 -1167.1 keV) were observed of which 13 are new; nine others which were reported previously are not confirmed. Absolute intensities of the y rays were determined with the aid of 4m beta measurements. A modified decay scheme is proposed and discussed; six levels in Pu with I =1, 2, 3, . . . , 6 are assigned to a E =1 octupole vibrational band. The half-life measured with high purity sources is 61.9+0.2 min. RADIOACTIVITY 61.9-min~~N ps from U(a,pn) and Pu(n, p 4n); radiochemistry, Ge(Li), and 4mP detectors. Measured Er, I", T~qq, 'deduced E,Iogft,~Pu level assignments and decay scheme.

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