Indications of octupole correlation in Sr-84

Excited states in the Sr-84 nucleus were investigated via the Ge-76(C-12,4n)Sr-84 reaction at a beam energy of 58 MeV. The de-excited ?-rays were detected using the Indian National Gamma Array (INGA) spectrometer at Inter-University Accelerator Center, New Delhi. Directional Correlation from Oriented (DCO) states ratio and the polarization asymmetry (& UDelta;) measurements were done to confirm the spin-parity of the low-lying states. Eight new ?-ray transitions were placed in the level scheme of Sr-84. The systematic behaviour of energy staggering S(I) of the ?-band (Band 1 and Band 2) was compared with the ?-bands in the mass A & AP; 80 region and the nuclei of other mass regions with similar behaviour (odd-I down). The E1 character is confirmed for strong ?-ray transitions connecting Band 3 to the Yrast band. Comparison of new results such as B(E1)/B(E2) ratio, frequency ratio ? (-)/? (+) and energy displacement & UDelta;E in Sr-84 with those of Se-72, Sm-150, Gd-152, Ra-220 and Th-224 nuclei suggests the presence of octupole correlations in Sr-84.