K-Capture - Positron Ratios for the First-Forbidden Transitions ofRb84and the Relative Probabilities ofL- andK- Electron Capture

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Abstract

The radiations from ${\mathrm{Rb}}^{84}$ have been investigated by means of scintillation coincidence spectrometer techniques in order to obtain the relative intensities of the various transitions. The energies and abundances of the radiations are 0.44-Mev ${\ensuremath{\beta}}^{\ensuremath{-}}$ (5%), 0.81-Mev ${\ensuremath{\beta}}^{+}$ (10%), 1.70-Mev ${\ensuremath{\beta}}^{+}$ (9%), 0.89-Mev $\ensuremath{\gamma}$ (64%), and 1.91-Mev $\ensuremath{\gamma}$ (0.9%). [Note added in proof.---The ${\ensuremath{\beta}}^{\ensuremath{-}}$ has been shown to be 0.91 Mev (2.5%).] Electron capture populates the level 1.91 Mev above the ground state, competes (54%) with the 0.81-Mev ${\ensuremath{\beta}}^{+}$ to populate the level 0.89 Mev above ground, and competes (21%) with the 1.70-Mev ${\ensuremath{\beta}}^{+}$ in effecting transitions to the ground state of ${\mathrm{Kr}}^{84}$. The ratios of $K$-capture to positron emission for the transition to the 0.89-Mev level ($\ensuremath{\Delta}I=0$, yes) and to the ${\mathrm{Kr}}^{84}$ ground state ($\ensuremath{\Delta}I=2$, yes) are 5.15\ifmmode\pm\else\textpm\fi{}0.38 and 2.06\ifmmode\pm\else\textpm\fi{}0.36, respectively. These values are in qualitative agreement with theory. Nucleon configurations of the several states of ${\mathrm{Rb}}^{84}$, ${\mathrm{Kr}}^{84}$, and ${\mathrm{Sr}}^{84}$ are discussed. In the decay to the 0.89-Mev level an $\frac{L}{K}$-capture ratio of 0.12\ifmmode\pm\else\textpm\fi{}0.05 was obtained by use of a value, 0.65, for the fluorescence yield of krypton. Alternatively, an experimental value for the fluorescence yield, 0.62\ifmmode\pm\else\textpm\fi{}0.03, may be computed if the theoretical $\frac{L}{K}$-capture ratio is assumed.

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