Author/Authors :
P.M. Walker، نويسنده , , D.M. Cullen ، نويسنده , , C.S. Purry، نويسنده , , D.E. Appelbe، نويسنده , , A.P. Byrne، نويسنده , , G.D. Dracoulis، نويسنده , , T. KIBEDI، نويسنده , , F.G. Kondev، نويسنده , , I.Y. Lee، نويسنده , , A.O. Macchiavelli، نويسنده , , A.T. Reed، نويسنده , , P.H. Regan، نويسنده , , F. Xu، نويسنده ,
Abstract :
Four-quasiparticle, Kπ = 12+ states in 172Hf and 178W, with half-lives less than 2 ns, are found to decay to their respective Kπ = 0+ ground-state bands, in competition with transitions to intermediate-K, two-quasiparticle structures. All decay transitions are weakly hindered. When taken together with other K-isomer decay rates, an overall trend of decreasing hindrance with increasing excitation energy is evident. Estimates based on density-of-states considerations approximately reproduce the trend of the data, but also indicate the need to include other K-mixing effects.
