Phys.Rev. C 104, 024330 (2021)

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

First direct observation of isomeric decay in neutron-rich odd-odd ¹⁸⁶Ta

RADIOACTIVITY ¹⁸⁶Ta(β^-), ^186mTa(IT)[from W(¹³⁶Xe, X), E=7.2 MeV/nucleon, followed by laser ionization and mass separation at the KEK Isotope Separation System (KISS) of RIBF-RIKEN facility]; measured Eγ, Iγ, (particle)γ-coin, half-lives of decays of ¹⁸⁶Ta and neutral ^186mTa from γ-decay curves. ¹⁸⁶Ta; deduced levels, J, π, E3 multipolarity of the 161-keV isomeric transition from a comparison of measured half-life of the neutral isomer with previous measurements of the ionized isomeric state of ¹⁸⁶Ta using the Experimental Storage Ring at GSI Darmstadt, no evidence found for the β decay mode of the ¹⁸⁶Ta isomer.

doi: 10.1103/PhysRevC.104.024330