Study of the high spin states of stable 84Sr

High spin states of 84Sr were populated by bombarding 70Zn target with 75MeV 18O beam provided by HI-13 Tandem Accelerator of CIAE. γ-γ coincidences and DCO ratios were measured using eight anticompton Ge detectors and one planar. A new level scheme of 84Sr was established in which 12 new energy states and nearly 30 new γ-transitions were identified in present work. Level scheme was compared with its even-even isotopes 78,80,82,86Sr. It shows that 84Sr is a transitional nucleus, namely its ground state band exhibits a collective nature. The negative bands were extended to spin of 19- and the γ-transition energies take on the nature of stagger. The negative band levels are in good agreement with D. C. M. theory caculations.