High spin states ofZr86

The level scheme of ${}_{}{}^{86}{}_{}{}^{}\mathrm{Zr}$ was studied by in-beam measurements on γ transitions in the ${}_{}{}^{60}{}_{}{}^{}\mathrm{Ni}$ ${(}^{29}$Si,2pnγ${)}^{86}$Zr reaction and by helium-jet studies of delayed γ-ray activity from the ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ ${(}^{32}$S,3pn${)}^{86}$Nb(β +/EC${)}^{86}$Zr reaction. In the latter study, measurements consisted of γ-γ and β-γ coincidences, excitation functions, and a lifetime determination. An ${}_{}{}^{86}{}_{}{}^{}\mathrm{Nb}$ decay scheme was obtained which suggests $J^{\pi }$ ${=5\mathrm{}}^{+}$ for the ${}_{}{}^{86}{}_{}{}^{}\mathrm{Nb}$ ground state. The in-beam study consisted of γ-γ coincidences, excitation functions, angular distributions, and lifetime measurements via both Doppler shift attenuation and recoil distance methods. The high-spin decay scheme and level lifetimes obtained from the in-beam studies suggest intrinsic modes of excitation rather than the collective behavior seen in ${}_{}{}^{84}{}_{}{}^{}\mathrm{Zr}$.