ADOPTED LEVELS for 222Ac
Authors: Balraj Singh, M.S. Basunia, Jun Chen Et Al., | Citation: Nucl. Data Sheets 192, 315 (2023) | Cutoff date: 25-Sep-2023
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-581 keV 11 | S(n)= 5980 keV 60 | S(p)= 3631 keV 6 | Q(α)= 7137.4 keV 20 | ||
| Reference: 2021WA16 |
| References: | |||
| A | 226Pa α decay (1.8 M) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) |
| 0 | A | 1- | 4.9 s 5 % ε = 1 1 % α = 99 1 |
| 0+X | 64 s 3 % IT = 5 5 % ε = 1.35 65 % α = 94 5 | ||
| 40 14 | A | ||
| 137 14 | A |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 1- | 4.9 s 5 % ε = 1 1 % α = 99 1 | %α=99 1. Possible ε branching was estimated by 1966Wa23 as 1-2% from Iα(7.13-MeV α) of 218Rn shown in 222Ac α spectrum by 1964Mc21. Theoretical partial T1/2>100 s for 222Ac ε+β+ decay (2019Mo01) gives (%ε+%β+)<5. |
| 0+X | 64 s 3 % IT = 5 5 % ε = 1.35 65 % α = 94 5 | %IT|<10 was deduced by 1972Es03 from ratio of Iα values of 4.9-s 222Ac and 64S 222Ac. E(level): %IT|<10 was deduced by 1972Es03 from ratio of Iα values of 4.9-s 222Ac and 64S 222Ac. |
1952Me13, 1964Mc21, 1968Ha14: identified ground state of 222Ac as daughter of 226Pa α decay, and parent of 218Fr (7130α) (1972Es03).
1972Es03: isomer in 222Ac identified in Pb(18O,pxn), as parent of 218Fr through 7870α, and grand-parent of 214At from 8810α at the Berkeley heavy-ion linear accelerator. Measured half-lives of the two activities in 222Ac and isomeric ratio.
Theoretical calculations:
1992Ch20: calculated well depths, quadrupole and hexadecapole deformations, level energies, static moments of inertia, oblate and prolate superdeformed features using fermion dynamic symmetry model.
2022He18: calculated T1/2 for α decay, α-preformation factor using density-dependent cluster model with RMF NN and M3Y NN interactions and universal decay law (UDL).
2022Ka09: calculated T1/2 for α decay for bare nuclei and He-like ions using adiabatic approach.
2021Sa52: calculated Q(2α), T1/2 for 2α-decay with and without the deformation effects using the modified generalized liquid drop model, and Coulomb and proximity potential model with different preformation factors for double α decay.
2020Zh36: calculated T1/2 for α decay, shell correction energies of the spherical parent and daughter nuclei using generalized liquid drop model, with the effects of the Strutinsky shell correction.
2013Sa54: calculated T1/2 for α and 14C decays from hypernucleus 222Ac and non-strange normal nucleus using fission model, the Coulomb and proximity potential model (CPPM).
Q-value: Q(ε)=2302 6, S(2n)=13265 7, S(2p)=9438 6 (2021Wa16)