Structure, directional-correlation, and lifetime measurements inTc95viaMo95(p,nγ)reaction spectrometry

The level structure and the decay properties of levels in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Tc}$ up to 2324 keV of excitation have been investigated via measurements of excitation functions of singles $\gamma$ rays and via $n\gamma$- and $\gamma \gamma$-coincidence experiments following the ${}_{}{}^{95}{}_{}{}^{}\mathrm{Mo}(p,n\gamma )$ reaction with proton energies between 3.1 and 6.5 MeV. From these experiments and from high resolution singles energy and directional-correlation measurements an extended decay scheme has been obtained which included 38 levels in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Tc}$ and incorporated 106 $\gamma$ rays. New levels at 882.10 (13/$2^{+}$), 957.12 (11/$2^{+}$), 1213.10 (9/$2^{+}$), 1214.53 (7/$2^{-}$), 1275.86 (3/$2^{-}$), 1281.46 (7/$2^{+}$), 1307.18 (11/$2^{+}$), 1631.97 (9/$2^{+}$, 11/$2^{+}$), 1694.50 (3/2 — 7/2), 1920.00 (1/2 — 5/2), 1920.98 (9/$2^{\pm }$), 1958.94 (9/$2^{\pm }$, 7/$2^{+}$), 2032.31 (7/$2^{+}$, 9/$2^{\pm }$), 2210.5, and 2219.7 keV with the assigned $J^{\pi }$ values in parentheses were postulated. Possible levels at 1033.85 (1/$2^{\pm }$), 1837.5, 2164.1, 2236.8, 2240.6, and 2318.2 keV are also proposed. The singles directional correlations for many transitions provided (i) reliable branching ratios, (ii) $J^{\pi }$ assignments, and (iii) multipole mixing ratios $\delta \left(\frac{E2\mathrm{}}{M1\mathrm{}}\right)$ from analysis of the correlations via the compound statistical theory for nuclear reactions. Lifetimes for 22 states in ${}_{}{}^{95}{}_{}{}^{}\mathrm{Tc}$ and lower limits for 7 additional states were obtained by the Doppler-shift-attenuation method via the ${}_{}{}^{95}{}_{}{}^{}\mathrm{Mo}(p,n\gamma )$ reaction at 4.38 and 4.88 MeV. The lifetimes were extracted from singles spectra taken in the presence of standards at seven or nine angles between 0° and 90° to the beam direction, by employin a careful centroid shift analysis of the data. For a...