Abstract
Four long-lived neutron-deficient Th isotopes with atomic mass numbers 211 to 218 and abundances of () relative to 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.
- Received 5 July 2007
DOI:https://doi.org/10.1103/PhysRevC.76.021303
©2007 American Physical Society