Search for long-lived isomeric states in neutron-deficient thorium isotopes

J. Lachner, I. Dillmann, T. Faestermann, G. Korschinek, M. Poutivtsev, and G. Rugel
Phys. Rev. C 78, 064313 – Published 19 December 2008

Abstract

The discovery of naturally occurring long-lived isomeric states (t1/2>108 yr) in the neutron-deficient isotopes Th211,213,217,218 [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.

  • Figure
  • Received 11 November 2008

DOI:https://doi.org/10.1103/PhysRevC.78.064313

©2008 American Physical Society

Authors & Affiliations

J. Lachner*, I. Dillmann, T. Faestermann, G. Korschinek, M. Poutivtsev, and G. Rugel

  • Physik Department E12 and E15, Technische Universität München, D-85748 Garching, Germany

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Vol. 78, Iss. 6 — December 2008

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