Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes

@article{Marinov2007ExistenceOL,
  title={Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes},
  author={A. Marinov and I. Rodushkin and Y. Kashiv and L. Halicz and I. Segal and A. Pape and R. Gentry and H. W. Miller and D. Kolb and R. Brandt},
  journal={Physical Review C},
  year={2007},
  volume={76},
  pages={021303}
}
Four long-lived neutron-deficient Th isotopes with atomic mass numbers 211 to 218 and abundances of (1-10)x10{sup -11} relative to {sup 232}Th have been found in a study of naturally-occurring Th using inductively coupled plasma-sector field mass spectrometry. It is deduced that long-lived isomeric states exist in these isotopes. The hypothesis that they might belong to a new class of long-lived high spin super- and hyperdeformed isomeric states is discussed. 
Review of metastable states in heavy nuclei.
Exploring the World by Reading the Isotope Language
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