Dataset by Balraj Singh, Jun Chen, and IAEA-ICTP-workshop participants: Diwanshu, S. Leblond, α. Rathi, p.S. Rawat, B. Rohila, and V. Vallet.

1948St42: ²²²Rn identified in ²³⁰U |) ²²⁶Th |)²²²Rn α-decay chain; ²³⁰U produced in the bombardment of Th with 19-MeV deuterons and 38-MeV He ions at the Berkeley cyclotron facility. Measured half-life of the decay of ²²²Rn from α decay. Later works on the study of ²²²Rn decay: 1956As38 (also at Berkeley) and 1958To25 (at Gustaf Werner cyclotron facility in Uppsala).

Theoretical structure calculations:

2023Zh13: calculated T_1/2 and branching ratios for α, 2α, and ¹⁴C cluster decays, quadrupole, octupole and hexadecupole deformation-energy surfaces using relativistic Hartree-Bogoliubov model with the DD-PC1 functional and a separable pairing force.

2022Ta16: calculated neutron and proton energy gaps, quadrupole and octupole deformation parameters using Hartree-Fock-Bogolyubov approximation with Skyrme forces.

2022Uz01: calculated quadrupole and octupole deformation parameters, rms proton matter radii, the total energy, and ¹⁴C cluster decay rate using Skyrme Hartree-Fock+BCS theory with SLy4 and SkM* interactions.

2021Ku31: calculated energy differences, neutron and proton energy gaps, deformation parameters using Hartree-Fock-Bogoliubov theory with an effective Skyrme interaction.

2020No13: calculated potential energy surfaces in (β₂,β₃) plane using self-consistent mean-field (SCMF), and interacting boson model (IBM), energies of yrast positive-parity and negative-parity states, and relative energy splitting between positive- and negative-parity yrast bands, B(E1), B(E2), B(E3), transition quadrupole and octupole moments using Hartree-Fock-Bogoliubov approximation, based on Gogny-D1M energy density functional, and sdf interacting boson model (IBM) Hamiltonian for quadrupole-octupole coupling and collective excitations

2019Zh50: calculated empirical proton-neutron interaction, B(E2), B(E3), binding energy, contour plot of total energy in (β₂,β₃) plane, neutron and proton single-particle levels by using the covariant density functional theory and the quadrupole-octupole collective Hamiltonian approach.

2015Bo05: calculated levels, Jπ, B(E1), Be(2), B(E3) using analytic quadrupole octupole axially (AQOA) symmetric model using Davidson potential. Bohr collective Hamiltonian, and quadrupole plus octupole deformation.

2013De12: calculated β₂ and deformation parameter, CSM parameter, α-core QQ coupling parameter, Iα to 2⁺, 4⁺ and 6⁺ states from ²²²Ra decay in daughter nuclei, B(E2), rigidity parameter, E(4⁺)/E(2⁺) and E(6⁺)/E(4⁺) ratios, effective charge, hindrance factors using coherent state model.

2001Ch02: calculated rotational bands energy vs spin using reflection-asymmetric shell model for octupole-deformed nuclei.

1998Ra05: calculated high-spin levels, Jπ, ground state and Kπ=0- bands using phenomenological model.

1997Bu07, 1997Bu28: calculated levels, Jπ, B(|l), deformation parameters, using mixed Saxon-Woods plus cubed Saxon-Woods cluster-core interaction.

1993Yo02, 1986Le05: calculations of B(E1)/B(E2) transition probabilities from the Kπ=0- band.

1989Eg02: calculated octupole barrier energies, pairing energy, deformation parameters β₂, β₄ and β₆, dipole moment vs constrained quadrupole moment using microscopic model.

1988Ro02, 1987Ro08: calculated E1, E3 transition probabilities and the 0⁺, 1- energy splitting, barrier heights, single particle and pairing energies vs octupole deformation, dipole vs octupole moments, B(E1)/B(E2) using constrained HF plus BCS method.

1988Ba48: calculated rotational band wave functions, quadrupole, and octupole deformations, energy splitting between the even- and odd-parity rotational bands using a collective Hamiltonian.

1987Na10: calculated levels, Jπ, routhians, rotational bands, B(E1)/B(E2) ratios, shape dependence using cranking model.

1986Bo19: calculated quadrupole-octupole deformation energy surface, nonzero octupole moment using self-consistent Hartree-Fock plus BCS calculations.

Theoretical calculations for decay characteristics:

2023Zh13: calculated T_1/2 and branching ratios for α, 2α and ¹⁴C cluster decays using relativistic Hartree-Bogoliubov model with the DD-PC1 functional and a separable pairing force, and proximity potential model for deformed nuclei.

2022Ka09: calculated T_1/2 for bare nuclei and He-like ions using adiabatic approach.

2020Ni01: calculated α-branching ratio to vibrational states, and α-decay half-life using multichannel cluster model.

2010Ro08: calculated HFB mean-field energies and octupole collective inertial parameters as function of octupole moment, particle-particle correlation energies, B(E1) and B(E3) probabilities, and dipole moments using Hartree-Fock-Bogoliubov approximation, and Barcelona-Catania-Paris energy density functionals.

Consult the NSR database for about 120 references for theoretical structure calculations, and about 230 theory references for α, 2α and ¹⁴C decays, and other cluster decay characteristics of ²²²Ra.

Levels: B(E1)(W.u.) and B(E2)(W.u.) deduced by evaluators from measured matrix elements in Coulomb excitation, except as noted

Levels: The Kπ=0⁺ g.s. band and the Kπ=0- band at 242.11 keV have been interpreted as octupole parity-doublet bands.

Q-value: S(2n)=12095 9, S(2p)=10870 5 (2021Wa16)