Identification of sub-μs isomeric states in the odd-odd nucleus Au178

S. A. Gillespie et al.
Phys. Rev. C 103, 044307 – Published 2 April 2021

Abstract

The neutron-deficient gold (Z=79) isotopes in the vicinity of the neutron midshell N=104 provide prolific examples of shape coexistence and isomerism at low excitation energy. They can be probed via a number of different experimental techniques. In this study, two new isomeric states with half-lives of 294(7) and 373(9) ns have been observed in the neutron-deficient odd-odd nuclide Au178 (N=99) in an experiment at the RITU gas-filled separator at JYFL, Jyväskylä. This result was achieved due to the use of a segmented planar germanium detector with a high efficiency at low energies. By applying the recoil-decay tagging technique, they were assigned to decay to two different long-lived α-decaying states in Au178.

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  • Received 24 September 2020
  • Accepted 22 March 2021

DOI:https://doi.org/10.1103/PhysRevC.103.044307

©2021 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 103, Iss. 4 — April 2021

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