Excited States of <SUP>135</SUP>La Populated by Decay of <SUP>135</SUP>Ce

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  • Excited states of 135La populated by the decay of 135Ce

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The decay of 135Ce was studied with a π\sqrt2 iron-free β-spectrometer, a Ge(Li) detector and an e−–γ delayed coincidence technique. From internal conversion and γ-ray studies 21 new transitions were observed. The multipolarities with mixing ratios of 10 transitions were determined from the L-subshell conversion ratios. From these results a revised decay scheme is proposed as follows: 0[5/2+], 119.47[7/2+], 206.37[5/2+], 265.42[3/2+], 299.92[1/2+], 665.30[5/2+], 783.38[3/2+], 828.20[3/2+], 872.15[1/2+(3/2+)], 984.29[1/2+, 3/2+], 1171.16[3/2+(1/2+)], 1438.95[1/2+, 3/2+] and 1767.3[1/2, 3/2], where level energies are written in keV. Large E2 enhancements are found for the 34.5, the 86.9, the 265.4 and the 299.9 keV transitions.

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