Author/Authors :
A. Galindo-Uribarri، نويسنده , , D. Ward، نويسنده , , G.C. Ball، نويسنده , , V.P. Janzen، نويسنده , , D.C. Radford، نويسنده , , I. Ragnarsson، نويسنده , , D. Headly، نويسنده ,
Abstract :
A rotational band has been discovered in the nucleus 64Zn; it extends from spin (12ℏ) to spin (24ℏ), and exhibits strong dipole transitions between its signature partners. In our interpretation, 64Zn takes on triaxial deformation (ε∼0.3γ∼30°) at intermediate spin when an f7/2 proton is promoted across the spherical shell-gap at Z=28 to the g9/2 orbital. The situation is parallel to that occurring in the smooth terminating bands in the Sn and Sb isotopes at the Z=50 shell-gap. The band in 64Zn is the first example of a collective band approaching termination in the mass A∼60 region.
