Journal
PHYSICAL REVIEW C
Volume 78, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.78.064313
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- DFG
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The discovery of naturally occurring long-lived isomeric states (t(1/2) > 10(8) yr) in the neutron-deficient isotopes Th-211,Th-213,Th-217,Th-218 [A. Marinov et al., Phys. Rev. C 76, 021303(R) (2007)] was reexamined using accelerator mass spectrometry (AMS). Because AMS does not suffer from molecular isobaric background in the detection system, it is an extremely sensitive technique. Despite our up to two orders of magnitude higher sensitivity we cannot confirm the discoveries of neutron-deficient thorium isotopes and provide upper limits for their abundances.
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