Decay of 1.65-hRu95to Levels inTc95

Abstract

The level structure of $^{95}\mathrm{Tc}$ has been investigated from the decay of 1.65-h $^{95}\mathrm{Ru}$. Singles $\ensuremath{\gamma}$-ray energy and intensity measurements were taken with a 42-${\mathrm{cm}}^{3}$ high-resolution Ge(Li) detector in an anti-Compton arrangement which employed a large NaI(Tl) annular detector. Energies and intensities have been determined for 81 $\ensuremath{\gamma}$ rays which have been observed to decay with the half-life of the $^{95}\mathrm{Ru}$ isotope. Extensive $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence Ge(Li)-Ge(Li) measurements have been utilized to establish $\ensuremath{\gamma}\ensuremath{-}\ensuremath{\gamma}$ coincidence relationships. The transitions to the ground and metastable state were identified from Ge(Li)-NaI(Tl) anticoincidence measurements. A decay scheme accommodating 71 transitions between 21 levels is proposed. The levels at 2168.2, 2189.0, 2267.5, and 2382.0 keV have not previously been reported. From deduced $log\mathrm{ft}$ values and measured $\ensuremath{\gamma}$-ray branching ratios definite ${J}^{\ensuremath{\pi}}$ assignments were made to a number of levels and limits for the ${J}^{\ensuremath{\pi}}$ values were placed for the rest of the levels in $^{95}\mathrm{Tc}$. The level structure of the $^{95}\mathrm{Tc}$ isotope is examined and compared with spectra derived on the basis of extended pairing-plus-quadrupole and shell-model calculations.