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arXiv · 1707.03786

The Half-lives of $^{132}$La and $^{135}$La

E. P. Abel·H. K. Clause·J. Fonslet·R. J. Nickles·G. W. Severin
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Abstract

The half-lives of $^{135}$La and $^{132}$La were determined via gamma spectroscopy and high-precision ionization chamber measurements. The results are 18.930(6) h for $^{135}$La and 4.59(4) h for $^{132}$La compared to the previously compiled values of 19.5(2) h and 4.8(2) h, respectively. The new results represent an improvement in the precision and accuracy of both values. These lanthanum isotopes comprise a medically interesting system with positron emitter $^{132}$La and Auger electron emitter $^{135}$La forming a matched pair for internal diagnostics and therapeutics. The precise half-lives are necessary for proper evaluation of their value in medicine and for a more representative tabulation of nuclear data.

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E. P. Abel, H. K. Clause, J. Fonslet, R. J. Nickles, G. W. Severin. 2017-07-12. The Half-lives of $^{132}$La and $^{135}$La. https://doi.org/10.1103/physrevc.97.034312

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