Structure of High Spin States in ⁸⁷Zr

Structure of high spin states in ⁸⁷Zr was studied through the reaction ⁵⁹Co(³²S, 3pn)⁸⁷Zr at a beam energy of 118 MeV using in-beam γ-ray spectroscopic method. Measurement of γ-γ coincidence was performed, and directional correlation orientation ratios of some γ rays were determined. The level scheme of ⁸⁷Zr was established up to spin (37/2⁺) and (43/2^-). Many previously unknown states have been observed. Comparison with neighboring isotones indicates that the effect of neutron on nuclear structure property is predominant compared to proton, and there is a tendency of reduction in band crossing frequency with increasing proton number.