Structure of high spin states in 87Zr

Structure of high spin states in Zr-87 was studied through the reaction Co-59(S-32, 3pn)Zr-87 at a beam energy of 118 MeV using in-beam gamma-ray spectroscopic method. Measurement of gamma - gamma coincidence was performed, and directional correlation orientation ratios of some gamma rays were determined. The level scheme of Zr-87 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.