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Physical Review C 76 (2007) 021303
Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes
A. Marinov, I. Rodushkin, Y. Kashiv, L. Halicz, I. Segal, A. Pape1, R.V. Gentry, H.W. Miller, D. Kolb, R. Brandt
(2007)

Four long-lived neutron-deficient Th isotopes with atomic mass numbers 211 to 218 and abundances of (1-10)x10(-11) relative to Th-232 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.
1 :  DRS-IPHC - Département Recherches Subatomiques
Chimie/Radiochimie
FIELD MASS-SPECTROMETRY – SPONTANEOUS FISSION – O-16+AU-197 REACTION – SUPERDEFORMED BAND – DECAY – ELEMENTS – DISCOVERY – NUCLEI – PLASMA – BETA