Evaluated data are presented for 11 known $A=222$ nuclides (Bi, Po, At, Rn, Fr, Ra, Ac, Th, Pa, U, and Np), and relevant J^π and T_1/2 data for $A=226$ nuclei decaying by α-decay to $A=222$ nuclei. For ²²²Bi, only the isotopic identification is established with no measurement of its half-life. For ²²²Po, ²²²At, ²²²Fr, ²²²U, and ²²²Np, data are available only for the ground states, with static magnetic dipole and electric quadrupole moments, and charge radius measurements for the ²²²Fr ground state. For ²²²Ac and ²²²Pa, two low-lying levels are known from ²²⁶Pa α decay, and ²²⁶Np decay, respectively, but with no information about J^π assignments and γ decays of these levels. For ²²²Pa, a long-lived isomeric state is known, decaying dominantly by α decay. ²²²Rn, ²²²Ra, and ²²²Th have been investigated in detail, the low-spin states by α decay and the high-spin studies of ground-state and octupole bands by in-beam γ-ray studies for all the three nuclei, as well as by Coulomb excitation for ²²²Rn and ²²²Ra. Low-spin levels in ²²²Ra have been investigated also through the ${\beta }^{-}$ decay of ²²²Fr. Half-lives of the excited states are known for 7 levels in ²²²Rn, 12 levels in ²²²Ra, and 3 levels in ²²²Th. Octupole deformations, with the presence of alternating-parity bands up to (16⁺) and (${21}^{-}$) in ²²²Rn, (20⁺) and (${19}^{-}$) in ²²²Ra, and (26⁺) and (${25}^{-}$) in ²²²Th, and with interband E1 transitions, have been established in these three nuclei. The present evaluation supersedes the previous $A=222$ ENSDF evaluations: (2011Si24), (1996El01), (1987El06) and (1977To14).

评估数据针对 11 个已知的$A=222$核素（Bi、Po、At、Rn、Fr、Ra、Ac、Th、Pa、U 和 Np）以及相关 J ^π和 T _1/2数据$A=226$原子核通过α衰变衰变为$A=222$原子核。对于²²² Bi，仅建立了同位素鉴定，未测量其半衰期。对于²²² Po、²²² At、²²² Fr、²²² U 和²²² Np，数据仅适用于基态，具有静磁偶极矩和电四极矩，以及²²² Fr 基态的电荷半径测量。对于²²² Ac 和^{222 Pa，分别从226} Pa α衰变和²²⁶ Np 衰变获知两个低位能级，但没有关于这些能级的J ^π分配和γ衰变的信息。对于²²² Pa，已知存在一种长寿命的异构态，主要通过α衰变进行衰变。²²² Rn、²²² Ra 和^{222 Th 已被详细研究，通过}α衰变进行低自旋态研究，并通过束内γ射线研究对所有三个原子核进行基态和八极带的高自旋研究，以及²²² Rn 和²²² Ra 的库仑激发。²²² Ra中的低自旋水平也通过${\beta }^{-}$²²² Fr的衰变 已知激发态的半衰期为²²² Rn 中的 7 个能级、²²² Ra 中的 12 个能级和²²² Th 中的 3 个能级。八极变形，存在高达 (16 ⁺ ) 和 (${21}^{-}$) 在²²² Rn, (20 ⁺ ) 和 (${19}^{-}$) 在²²² Ra 中，以及 (26 ⁺ ) 和 (${25}^{-}$）在²²² Th 中，以及带间 E1 跃迁，已在这三个原子核中建立。本评估取代之前的评估$A=222$ENSDF 评估：(2011Si24)、(1996El01)、(1987El06) 和 (1977To14)。