Abstract
The energies of seven low-lying excited levels of 90Zr, 91Zr, and 92Zr have been measured to within a few tenths of a keV. A high-intensity bremsstrahlung beam from a linear accelerator was used to create the radioactive niobium nuclei, 92Nb, 91Nb, and 90Nb by the (γ,n), (γ,2n), and (γ,3n) reactions on 93Nb. After the niobium nuclei decayed to the zirconium isotopes, 92Zr, 91Zr, and 90Zr, the energies of the transition γ-rays from these zirconium isotopes were measured with a high-resolution, lithium-drifted germanium detector and were used to determine the energy levels of the zirconium isotopes. The energy levels determined in this way are, for 90Zr, 2186·3, 2318·8, 3447·6, and 3590·4 keV; for 91Zr, 1205·0 keV; and for 92Zr, 934·3 and 1847·2 keV.
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