Radiochemical and Spectrometer Studies of Several Neutron-Deficient Zirconium Isotopes and Their Decay Products

摘要: Radioactive zirconium isotopes of mass number 90 have been prepared by bombardment niobium with 100-Mev protons. These and their decay products extensively studied in the beta-ray spectrometer radiochemical methods. ${\mathrm{Zr}}^{87}$ is shown to be a 94\ifmmode\pm\else\textpm\fi{}6-minute activity, emitting positrons 2.10\ifmmode\pm\else\textpm\fi{}0.02-Mev energy decaying into ${\mathrm{Y}}^{87m}$. Accompanying its 14-hour ${\mathrm{Y}}^{87}$, ${\mathrm{Y}}^{87m}$ has complex gamma-ray spectrum. The most prominent conversion electrons correspond 0.389\ifmmode\pm\else\textpm\fi{}0.004-Mev gamma-ray. ${\mathrm{Y}}^{87}$ decays orbital electron capture ${\mathrm{Sr}}^{87m}$ which emission 0.394\ifmmode\pm\else\textpm\fi{}0.004-Mev 2.80\ifmmode\pm\else\textpm\fi{}0.03 hour half-life stable ${\mathrm{Sr}}^{87}$. ${\mathrm{Zr}}^{86}$ 17\ifmmode\pm\else\textpm\fi{}2-hour capturing isotope ${\mathrm{Y}}^{86}$, turn disintegrates ${\mathrm{Sr}}^{86}$ 14.6\ifmmode\pm\else\textpm\fi{}0.2 hours positrons. This positron spectrum complex, two components approximately equal intensity. energies are 1.80\ifmmode\pm\else\textpm\fi{}0.02 1.19\ifmmode\pm\else\textpm\fi{}0.02 Mev. latter appears forbidden Fermi-Kurie plot corresponding first-forbidden transition spin change units parity.The ${\mathrm{Zr}}^{89}$ redetermined as 0.910\ifmmode\pm\else\textpm\fi{}0.010 Conversion previously unreported gamma-rays 0.027, 0.396, 0.917, 1.27 Mev observed. Preliminary evidence for ${\mathrm{Zr}}^{88}$ presented indicates that this decays, order 150 days, 105-day ${\mathrm{Y}}^{88}$. 0.406-Mev ${\mathrm{Zr}}^{88}$.