Search for thep12Isomeric State inTc101and Identification of Energy Levels

Abstract

Careful half-life measurements by various methods give 14.6±0.1 min for ${\mathrm{Mo}}^{101}$ and 14.3±0.1 min for ${\mathrm{Tc}}^{101}$. Measurements of the $\beta$ and $\gamma$ energies give substantially the same values as previous workers report. Spin and parity assignments have been made to all levels observed. A search was made for the possible existence of isomeric $p_{\frac{1}{2}}$ ${\mathrm{Tc}}^{101m}$, with no evidence for measurable half-life. The evidence is that this state lies above the $\frac{7}{2}+$ state, and decays to it by an $E3\mathrm{}$ transition with short half-life rather than by $M4\mathrm{}$ transition to the $g_{\frac{9}{2}}$ state.