First direct observation of isomeric decay in neutron-rich odd-odd Ta186

Watanabe, Y. X.; Walker, P. M.; Hirayama, Y.; Mukai, M.; Watanabe, H.; Lane, G. J.; Ahmed, M.; Brunet, M.; Hashimoto, T.; Ishizawa, S.; Kimura, S.; Kondev, F. G.; Litvinov, Yu. A.; Miyatake, H.; Moon, J. Y.; Niwase, T.; Oyaizu, M.; Park, J. H.; Podolyák, Zs.; Rosenbusch, M.; Schury, P.; Wada, M.

doi:10.1103/physrevc.104.024330

Title: First direct observation of isomeric decay in neutron-rich odd-odd Ta186

Journal Article · 26 August 2021 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.104.024330 · OSTI ID:1819649

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High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies
Univ. of Surrey, Guildford (United Kingdom)
Univ. of Tsukuba (Japan); High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science
Beihang University, Beijing (China). International Research Center for Nuclei and Particles in the Cosmos; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science; High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies
Australian National Univ., Canberra, ACT (Australia)
Univ. of Tsukuba (Japan); High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies
Institute for Basic Science (IBS), Daejeon (Korea, Republic of)
Yamagata Univ. (Japan); High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science
Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science
Argonne National Lab. (ANL), Argonne, IL (United States)
GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany)
Kyushu University, Nishi-ku, Fukuoka (Japan); High Energy Accelerator Research Organization (KEK), Wako (Japan). Wako Nuclear Science Center, Institute of Particle and Nuclear Studies; Inst. of Physical and Chemical Research (RIKEN), Wako (Japan). Nishina Center for Accelerator-Based Science

Deexcitation γ rays associated with an isomeric state of ¹⁸⁶Ta were investigated. The isomers were produced in multinucleon transfer reactions between a ¹³⁶Xe beam and a natural W target and were collected and separated by the KEK Isotope Separation System. Two γ transitions with energies of 161.1(2) and 186.8(1) keV associated with an isomeric decay were observed for the first time. The half-life of the isomeric state of the neutral atom ^186mTa was deduced as 17(2) s. Based on the comparison with the previous measurements of the isomeric state using the Experimental Storage Ring at GSI Darmstadt and the coupling of angular momenta of individual particle orbitals in odd-odd nuclei, a decay scheme of ^186mTa was proposed.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: European Research Council (ERC); Japan Society for the Promotion of Science (JSPS); National Natural Science Foundation of China (NSFC); Science and Technology Facilities Council (STFC); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1819649

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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