High spin structure of 84Y

The high spin levels of 84Y have been established up to 12 MeV excitation energy and probable spin of 25+ through the reaction 59Co(28Si,2pn)84Y using in-beam γ-ray spectroscopic techniques. The γ transitions in 84Y have been identified through the particle-gamma coincidences. The level scheme was constructed through the γ-γ coincidences, angular distribution, and directional correlation orientation ratios. The positive parity yrast band built on the (πg9/2 direct-product νg9/2) configuration shows a large signature splitting and a signature inversion at I∼11ℎ. The measured B(E2; I→I-2) values give a deformation β2∼0.17. The negative parity band shows a signature inversion at I∼11ℎ and B(M1; I→I-1) enhancement for I>11ℎ. The projected Hartree-Fock and the cranked shell model calculations provide an understanding for the observed properties of the energy levels in 84Y