ADOPTED LEVELS, GAMMAS for 222Rn
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-)=-6 keV 8 | S(n)= 6171 keV 6 | S(p)= 7700 keV 14 | Q(α)= 5590.4 keV 3 | ||
Reference: 2021WA16 |
References: | |||
A | 226Ra α decay (1603 Y) | B | 232Th(136Xe,xγ) |
C | Coulomb Excitation |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | ABC | 0+ | 3.8222 d 9 % α = 100 | |||||
186.211 13 | ABC | 2+ | 0.32 ns 2 | 186.211 13 | 100 | E2 | 0.0 | 0+ |
448.48 6 | ABC | 4+ | 52.5 ps +44-23 | 262.27 5 | 100 | [E2] | 186.211 | 2+ |
600.74 4 | ABC | 1- | 0.7 ps +11-5 | 414.60 5 600.66 5 | 60 100 | [E1] [E1] | 186.211 0.0 | 2+ 0+ |
635.57 9 | ABC | 3- | ≈ 0.4 ns | 34.81 16 S 187.10 20 ? 449.37 10 | ≈0.032 ≈100 | [E2] [E1] [E1] | 600.74 448.48 186.211 | 1- 4+ 2+ |
768.08 21 | BC | (6+) | 15.9 ps +18-11 | 319.6 2 | 100 | [E2] | 448.48 | 4+ |
797.4 5 | BC | (5-) | 163.0 5 ? 348.9 5 | | [E2] | 635.57 448.48 | 3- 4+ | |
867.0 7 | C | (0+) | 266 2 681 | | [E1] [E2] | 600.74 186.211 | 1- 2+ | |
867.1 7 | C | (2+) | 681 867 | | [E2+M1] [E2] | 186.211 0.0 | 2+ 0+ | |
959.2 10 | C | (3+) | 773 | | [E2+M1] | 186.211 | 2+ | |
1048.7 5 | BC | (7-) | 251.4 5 ? 280.6 5 | 100 28 | [E2] [E1] | 797.4 768.08 | (5-) (6+) | |
1111.5 10 | C | (4+) | 663 | | [E2+M1] | 448.48 | 4+ | |
1127.7 3 | BC | (8+) | 7.3 ps +11-16 | 359.6 2 | 100 | [E2] | 768.08 | (6+) |
1356.5 5 | BC | (9-) | 7 ps +9-5 | 228.8 5 307.7 5 | 74 42 100 42 | [E1] [E2] | 1127.7 1048.7 | (8+) (7-) |
1512.5 4 | BC | (10+) | 7.8 ps +51-12 | 384.9 2 | 100 | [E2] | 1127.7 | (8+) |
1707.8 5 | B | (11-) | 195.4 5 351.2 5 | 48 31 100 31 | [E1] [E2] | 1512.5 1356.5 | (10+) (9-) | |
1912.9 6 ? | B | (12+) | 400.4 5 ? | | 1512.5 | (10+) | ||
2088.7 7 | B | (13-) | 175.6 5 ? 380.9 5 | 100 53 | [E2] | 1912.9 1707.8 | (12+) (11-) | |
2316.7 8 ? | B | (14+) | 403.8 5 ? | | 1912.9 | (12+) | ||
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
2485.0 9 ? | B | (15-) | 396.3 5 ? | | 2088.7 | (13-) | ||
2727.2 10 ? | B | (16+) | 410.5 5 ? | | 2316.7 | (14+) | ||
2881.6 10 ? | B | (17-) | 396.6 5 ? | | 2485.0 | (15-) | ||
3285.6 12 ? | B | (19-) | 404.0 5 ? | | 2881.6 | (17-) | ||
3695.8 13 ? | B | (21-) | 410.2 5 ? | | 3285.6 | (19-) |
E(level): From least-squares fit to Eγ data
Jπ(level): From band assignments in 232Th(136Xe,Xγ) for levels above 635 keV
T1/2(level): For levels above 186 keV, half-lives deduced by evaluators from E2 matrix elements measured (2022Sp01) in Coulomb excitation
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Kπ=0+ g.s. band. | |||||||
0.0 | 0+ | 3.8222 d 9 % α = 100 | |||||
186.211 13 | 2+ | 0.32 ns 2 | 186.211 13 | 100 | E2 | 0.0 | 0+ |
448.48 6 | 4+ | 52.5 ps +44-23 | 262.27 5 | 100 | [E2] | 186.211 | 2+ |
768.08 21 | (6+) | 15.9 ps +18-11 | 319.6 2 | 100 | [E2] | 448.48 | 4+ |
1127.7 3 | (8+) | 7.3 ps +11-16 | 359.6 2 | 100 | [E2] | 768.08 | (6+) |
1512.5 4 | (10+) | 7.8 ps +51-12 | 384.9 2 | 100 | [E2] | 1127.7 | (8+) |
1912.9 6 | (12+) | 400.4 5 ? | | 1512.5 | (10+) | ||
2316.7 8 | (14+) | 403.8 5 ? | | 1912.9 | (12+) | ||
2727.2 10 | (16+) | 410.5 5 ? | | 2316.7 | (14+) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - Kπ=0- octupole vibrational band. | |||||||
600.74 4 | 1- | 0.7 ps +11-5 | |||||
635.57 9 | 3- | ≈ 0.4 ns | 34.81 16 S 187.10 20 ? 449.37 10 | ≈0.032 ≈100 | [E2] [E1] [E1] | 600.74 448.48 186.211 | 1- 4+ 2+ |
797.4 5 | (5-) | 163.0 5 ? 348.9 5 | | [E2] | 635.57 448.48 | 3- 4+ | |
1048.7 5 | (7-) | 251.4 5 ? 280.6 5 | 100 28 | [E2] [E1] | 797.4 768.08 | (5-) (6+) | |
1356.5 5 | (9-) | 7 ps +9-5 | 228.8 5 307.7 5 | 74 42 100 42 | [E1] [E2] | 1127.7 1048.7 | (8+) (7-) |
1707.8 5 | (11-) | 195.4 5 351.2 5 | 48 31 100 31 | [E1] [E2] | 1512.5 1356.5 | (10+) (9-) | |
2088.7 7 | (13-) | 175.6 5 ? 380.9 5 | 100 53 | [E2] | 1912.9 1707.8 | (12+) (11-) | |
2485.0 9 | (15-) | 396.3 5 ? | | 2088.7 | (13-) | ||
2881.6 10 | (17-) | 396.6 5 ? | | 2485.0 | (15-) | ||
3285.6 12 | (19-) | 404.0 5 ? | | 2881.6 | (17-) | ||
3695.8 13 | (21-) | 410.2 5 ? | | 3285.6 | (19-) | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - Possible γ band | |||||||
867.1 7 | (2+) | ||||||
959.2 10 | (3+) | 773 | | [E2+M1] | 186.211 | 2+ | |
1111.5 10 | (4+) | 663 | | [E2+M1] | 448.48 | 4+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
186.211 | 2+ | 0.32 ns 2 | 186.211 13 | E2 | 0.677 | B(E2)(W.u.)=58 4, α=0.677 9 |
448.48 | 4+ | 52.5 ps +44-23 | 262.27 5 | [E2] | 0.2087 | B(E2)(W.u.)=90 +4-7, α=0.2087 30 |
600.74 | 1- | 0.7 ps +11-5 | 414.60 5 | [E1] | 0.01628 | B(E1)(W.u.)=0.0014 +23-9, α=0.01628 23 |
1- | 0.7 ps +11-5 | 600.66 5 | [E1] | 0.00762 | B(E1)(W.u.)=7E-4 +21-4, α=0.00762 11 | |
635.57 | 3- | ≈ 0.4 ns | 34.81 16 | [E2] | 1.30×103 | B(E2)(W.u.)=80 +32-27, α=1.30E3 4 |
3- | ≈ 0.4 ns | 187.10 20 | [E1] | 0.1011 | α=0.1011 14 | |
3- | ≈ 0.4 ns | 449.37 10 | [E1] | 0.0137 | B(E1)(W.u.)≈4E-6, α=0.0137 2 | |
768.08 | (6+) | 15.9 ps +18-11 | 319.6 2 | [E2] | 0.1144 | B(E2)(W.u.)=120 +9-12, α=0.1144 16 |
797.4 | (5-) | 163.0 5 | [E2] | 1.116 | B(E2)(W.u.)=4.6 +12-17, α=1.116 21 | |
867.0 | (0+) | 266 2 | [E1] | 0.0438 | B(E1)(W.u.)=1.4E-3 +11-8, α=0.0438 10 | |
(0+) | 681 | [E2] | 0.0176 | B(E2)(W.u.)=13 4, α=0.0176 3 | ||
867.1 | (2+) | 681 | [E2+M1] | 0.042 | B(E2)(W.u.)=6.8 42, α=0.042 25 | |
(2+) | 867 | [E2] | 0.0107 | B(E2)(W.u.)=1.5 +4-5, α=0.0107 2 | ||
959.2 | (3+) | 773 | [E2+M1] | 0.031 | B(E2)(W.u.)=26 +14-17, α=0.031 17 | |
1048.7 | (7-) | 251.4 5 | [E2] | 0.240 | B(E2)(W.u.)=26E1 +12-10, α=0.240 4 | |
(7-) | 280.6 5 | [E1] | 0.0387 | α=0.0387 6 | ||
1111.5 | (4+) | 663 | [E2+M1] | 0.04 | B(E2)(W.u.)=11.5 +39-45, α=0.04 3 | |
1127.7 | (8+) | 7.3 ps +11-16 | 359.6 2 | [E2] | 0.0819 | B(E2)(W.u.)=149 +42-19, α=0.0819 12 |
1356.5 | (9-) | 7 ps +9-5 | 228.8 5 | [E1] | 0.0624 | α=0.0624 9 |
(9-) | 7 ps +9-5 | 307.7 5 | [E2] | 0.1279 | B(E2)(W.u.)=20E1 +19-8, α=0.1279 19 | |
1512.5 | (10+) | 7.8 ps +51-12 | 384.9 2 | [E2] | 0.0680 | B(E2)(W.u.)=100 +26-39, α=0.0680 10 |
1707.8 | (11-) | 195.4 5 | [E1] | 0.0910 | α=0.0910 14 | |
(11-) | 351.2 5 | [E2] | 0.0874 | α=0.0874 13 | ||
2088.7 | (13-) | 380.9 5 | [E2] | 0.0700 | α=0.0700 10 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 0+ | 3.8222 d 9 % α = 100 | With Q(β-)=-6 8 (2021Wa16), no β- decay is expected. E(level): With Q(β-)=-6 8 (2021Wa16), no β- decay is expected. Kπ=0+ g.s. band. |
186.211 | 2+ | 0.32 ns 2 | μ=+0.92 14 (1970Or02,2020StZV), Q=-1.4 +5-6 E(level): Kπ=0+ g.s. band. |
448.48 | 4+ | 52.5 ps +44-23 | (α)(262γ)(θ) data of 1989Po03 rule out J of 0, 1, 2 and 3; population of natural-parity state in α decay from 0+ parent. E(level): (α)(262γ)(θ) data of 1989Po03 rule out J of 0, 1, 2 and 3; population of natural-parity state in α decay from 0+ parent. Kπ=0+ g.s. band. |
600.74 | 1- | 0.7 ps +11-5 | E(level): Kπ=0- octupole vibrational band. |
635.57 | 3- | ≈ 0.4 ns | (α)(449γ)(θ) data of 1989Po03 rules out 0, 1, 2 and 4; population of natural-parity state in α decay from 0+ parent. E(level): (α)(449γ)(θ) data of 1989Po03 rules out 0, 1, 2 and 4; population of natural-parity state in α decay from 0+ parent. Kπ=0- octupole vibrational band. |
768.08 | (6+) | 15.9 ps +18-11 | E(level): Kπ=0+ g.s. band. |
797.4 | (5-) | E(level): Kπ=0- octupole vibrational band. | |
867.1 | (2+) | E(level): Possible γ band. | |
959.2 | (3+) | E(level): Possible γ band. | |
1048.7 | (7-) | E(level): Kπ=0- octupole vibrational band. | |
1111.5 | (4+) | E(level): Possible γ band. | |
1127.7 | (8+) | 7.3 ps +11-16 | E(level): Kπ=0+ g.s. band. |
1356.5 | (9-) | 7 ps +9-5 | D0/Q0=0.00191 b1/2 35 (1999Co02). E(level): D0/Q0=0.00191 b1/2 35 (1999Co02). Kπ=0- octupole vibrational band. |
1512.5 | (10+) | 7.8 ps +51-12 | E(level): Kπ=0+ g.s. band. |
1707.8 | (11-) | Average D0=0.010 eb1/2 2 (1999Co02) for J=9 and 11 states. E(level): Average D0=0.010 eb1/2 2 (1999Co02) for J=9 and 11 states. Kπ=0- octupole vibrational band. | |
1912.9 | (12+) | E(level): Kπ=0+ g.s. band. | |
2088.7 | (13-) | E(level): Kπ=0- octupole vibrational band. | |
2316.7 | (14+) | E(level): Kπ=0+ g.s. band. | |
2485.0 | (15-) | E(level): Kπ=0- octupole vibrational band. | |
2727.2 | (16+) | E(level): Kπ=0+ g.s. band. | |
2881.6 | (17-) | E(level): Kπ=0- octupole vibrational band. | |
3285.6 | (19-) | E(level): Kπ=0- octupole vibrational band. | |
3695.8 | (21-) | E(level): Kπ=0- octupole vibrational band. |
E(level) | E(gamma) | Comments |
867.0 | 681 | E(γ): Multiply placed |
867.1 | 681 | E(γ): Multiply placed |
Dataset by Balraj Singh, S. Basunia, and IAEA-ICTP workshop participants: B.M.S. Amro, S. Basu, S. Das, α. Karmakar, and S.S. Nayak
222Rn is a naturally occuring radioactive isotope, emitted from the α decay of 226Ra, a long-lived activity produced in the decay chain of 238U, first identified by 1899Cu01, just three years after the discovery of radioactivity, followed by the first measurement of half-life of 222Rn decay by 1902Cu01.
Mass measurement: 2010Li02: Schottky mass spectrometry.
Theoretical nuclear structure calculations:
2021Va08: calculated levels, Jπ, yrast positive- and negative-parity states, B(E1), B(E2), B(E3), B(M1), magnetic dipole and electric quadrupole moments using the spdf-IBM-2 interacting boson model.
2020Ca18: calculated deformation parameters β2, β3, octupole deformation energies, proton quadrupole Q20 and octupole Q30 moments for octupole-deformed nuclei using Skyrme energy density functional, and covariant energy density functional models.
2019Zh50: calculated empirical proton-neutron interaction, B(E2), B(E3), binding energy, total energy in (β2,β3) plane, neutron and proton single-particle levels using the covariant density functional theory and the quadrupole-octupole collective Hamiltonian.
2018Yo12: calculated E(first 4+)/E(first 2+) ratio, energy of the first 3- state using shell model with one-octupole-phonon representing collective octupole vibration across the magic core.
2017Xi15: calculated levels, Jπ, B(E1), B(E2), B(E3), electric dipole moment, deformation energy surface in (β2,β3) plane, reflection-asymmetric states using microscopic quadrupole-octupole collective Hamiltonian (QOCH), based on based on relativistic energy density functional.
2014De43, 2013De12: calculated energy levels, Jπ, deformation parameters, B(E2), T1/2 using coherent state model (CSM).
2013Ro30: calculated level energies of 1- states, B(E1), B(E3) using two-dimensional generator coordinate method (GCM) for quadrupole-octupole coupling with Gogny forces.
2005Za02, 2001Za04: calculated levels, Jπ, transition rates, octupole excitations using interacting boson model.
1998Ra05: calculated high-spin levels, Jπ, Kπ=0- band using phenomenological model.
1994Li05: calculated total energy surface vs α20, α32 deformations, fourfold degenerate levels using the results of realistic total nuclear energy calculations.
1987Ro08: calculated single-particle states, pairing energies, octupole deformation, dipole vs octupole moments, B(E1)/B(E2) using constrained HF plus BCS method.
1983Ro14: calculated potential equilibrium deformation, deformation energies, static quadrupole and hexadecapole moments using density-dependent shell correction method.
1982Le19: calculated potential energy minima, octupole separation energy, and intrinsic reflection symmetry breaking using deformed shell-model.
1981Gy03: calculated potential energy, quadrupole and octupole equilibrium deformations using macroscopic-microscopic method.
1981Pe09: analyzed levels, Jπ, strong Coriolis coupling effects for rotational bands based on one-phonon octupole vibrational states.
1980Sh07: analyzed levels, Jπ, inverse moments of inertia; deduced structural relation of Kπ=0+ and Kπ=0- bands.
Other theoretical calculations: 14 primary references for structure, and 76 primary references for decay characteristics are in the NSR database, and listed in this dataset as ’document’ records.
Levels: The Kπ=0+ g.s. band and the Kπ=0- band at 600.66 keV have been interpreted as octupole parity-doublet bands. However, 2022Sp01 and 2020Bu20 in their Coulomb excitation study do not support stable octupole deformation in the ground state of 222Rn
Gammas: B(E2)(W.u.) and B(E1)(W.u.) values are from Coulomb excitation, deduced by evaluators from measured transition matrix elements, with exceptions noted.
Q-value: S(2n)=10382.7 19, S(2p)=13469 18 (2021Wa16).