@ARTICLE{,
  author = {Jeet, Justin and Schneider, Christian and Sullivan, Scott T. and Rellergert, Wade G. and Mirzadeh, Saed and Cassanho, A. and Jenssen, H. P. and Tkalya, Eugene V. and Hudson, Eric R.},
  title = {Results of a Direct Search Using Synchrotron Radiation for the Low-Energy \textsuperscript{229}{Th} Nuclear Isomeric Transition},
  journal = {Phys. Rev. Lett.},
  year = {2015},
  volume = {114},
  pages = {253001},
  month = {jun},
  url = {http://link.aps.org/doi/10.1103/PhysRevLett.114.253001},
  doi = {10.1103/PhysRevLett.114.253001},
  abstract = {We report the results of a direct search for the $^{229}$Th ($I^\pi = 3/2^+\leftarrow 5/2^+$) nuclear isomeric transition, performed by exposing $^{229}$Th-doped LiSrAlF$_6$ crystals to tunable vacuum-ultraviolet synchrotron radiation and observing any resulting fluorescence. We also use existing nuclear physics data to establish a range of possible transition strengths for the isomeric transition. We find no evidence for the thorium nuclear transition between $7.3 \mbox{eV}$ and $8.8 \mbox{eV}$ with transition lifetime $(1-2)\mbox{s} \lesssim \tau \lesssim (2000-5600)\mbox{s}$. This measurement excludes roughly half of the favored transition search area and can be used to direct future searches.}
}