Identification of excited states in $^{188}\mathrm{Bi}$ and $^{188}\mathrm{Po}$
- Zhang, W.Q.
- Andreyev, A.N.
- Liu, Z.
- Seweryniak, D.
- Huang, H.
- Li, Z.H.
- Li, J.G.
- Guo, C.Y.
- Barzakh, A.E.
- van Duppen, P.
- Al Monthery, M.
- Andel, B.
- Antalic, S.
- Block, M.
- Bronis, A.
- Carpenter, M.P.
- Copp, P.
- Cubiss, J.G.
- Ding, B.
- Doherty, D.T.
- Favier, Z.
- Giacoppo, F.
- Huang, T.H.
- Kindler, B.
- Kondev, F.G.
- Lauritsen, T.
- Li, G.S.
- Lommel, B.
- Lu, H.Y.
- Mošať, P.
- Niu, Y.F.
- Raison, C.
- Reviol, W.
- Savard, G.
- Stolze, S.
- Wilson, G.L.
- Wu, H.Y.
- Wang, Z.H.
- Xu, F.R.
- Yu, X.H.
- Zeng, Q.B.
- Zhou, X.H.
DOIAbstract
International audienceThe neutron-deficient Bi188 and Po188 isotopes have been studied by γ-ray spectroscopy using the recoil-decay tagging technique with the Argonne Gas-Filled Analyzer. A new 0.25(5)-μs isomeric state and a prompt cascade formed by 319-, 366-, and 462-keV γ rays have been established on top of the (10−) α-decaying isomer in Bi188. The first excited (2+) state in Po188 was identified, its excitation energy of 242(2) keV continues the nearly constant trend for the first 2+ states in Po190,192,194. The state is most likely a member of a prolate rotational band built on the ground state, albeit mixing with other coexisting configurations cannot be excluded. The new results obtained in the present work provide new information ...
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