@ARTICLE{,
author = {Tkalya, E. V. and Schneider, Christian and Jeet, Justin and Hudson, Eric R.},
title = {Radiative lifetime and energy of the low-energy isomeric level in \textsuperscript{229}{Th}},
journal = {Phys. Rev. C},
year = {2015},
volume = {92},
number = {5},
pages = {054324},
month = {nov},
url = {http://link.aps.org/doi/10.1103/PhysRevC.92.054324},
doi = {10.1103/PhysRevC.92.054324},
abstract = {We estimate the range of the radiative lifetime and energy of the anomalous, low-energy $3/2^+(7.8 \pm 0.5$~eV) state in the $^{229}$Th nucleus. Our phenomenological calculations are based on the available experimental data for the intensities of $M1$ and $E2$ transitions between excited levels of the $^{229}$Th nucleus in the $K^{\pi}[Nn_Z\Lambda]=5/2^+[633]$ and $3/2^+[631]$ rotational bands. We also discuss the influence of certain branching coefficients, which affect the currently accepted measured energy of the isomeric state. From this work, we establish a favored region, $0.66\times10^6~{\text{s~eV}}^3/\omega^3 \leq\tau\leq 2.2\times10^6~{\text{s~eV}}^3/\omega^3$, where the transition lifetime $\tau$ as a function of transition energy $\omega$ should lie at roughly the 95\% confidence level. Together with the result of [Beck et al.: LLNL-PROC-415170 (2009)], we establish a favored area where transition lifetime and energy should lie at roughly the 90\% confidence level. We also suggest new nuclear physics measurements, which would significantly reduce the ambiguity in the present data.}
}