A New Short-Lived Isomer in 114Sb

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Abstract
A new short-lived isomer in 114 Sb was found by using the technique of the in-beam gamma spectroscopy. Two new gamma rays at energies of 96 keV and 326 keV, decaying with a half-life of 275±20 µ sec, were found. A ratio of the intensities of the 326 keV gamma ray to that of the 96 keV gamma ray was obtained to be 1.0:0.34. The character of the 326 keV gamma ray was deduced to be an E 3 transition and was found to be enhanced 6.9 times than the single particle estimate. The 96 keV transition was concluded to be an E2 transition. A decay sequence of 8 - –0.326 keV (E 3)→5 + –96 keV (E2)→3 + (ground state of 114 Sb) may be proposed. The observed enhancement of the E3 transition is explained in terms of a mixture of the E3 core polarization.