ADOPTED LEVELS, GAMMAS for 216Rn
Author: C. Morse | Citation: Nucl. Data Sheets 209, 409 (2026) | Cutoff date: 5-Aug-2025
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-2718 keV 7 | S(n)= 6649 keV 8 | S(p)= 5779 keV 9 | Q(α)= 8198 keV 6 | ||
| Reference: 2021Wa16 |
| References: | |||
| A | 220Ra α decay | B | 208Pb(14C,α2nγ),(18O,2α2nγ) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | 0+ | 45 µs 4 % α = 100 | |||||
| 461.40 20 | AB | 2+ | 461.4 2 | 100 | E2 | 0.0 | 0+ | |
| 840.5 3 | B | (4+) | 379.1 2 | 100 | E2 | 461.40 | 2+ | |
| 1225.9 4 | B | (6+) | 385.4 2 | 100 | E2 | 840.5 | (4+) | |
| 1645.0 4 | B | (8+) | 419.1 2 | 100 | E2 | 1225.9 | (6+) | |
| 1785.7 4 | B | 559.8 2 | 100 | 1225.9 | (6+) | |||
| 1837.5 5 | B | 192.5 2 | 100 | 1645.0 | (8+) | |||
| 1932.0 5 | B | 287.0 2 | 100 | 1645.0 | (8+) | |||
| 1939.7 5 | B | (10+) | 102.2 2 294.7 2 | 5.6 9 100 8 | E2 | 1837.5 1645.0 | (8+) | |
| 2342.5 5 | B | 410.5 2 | 100 | 1932.0 | ||||
| 2405.6 5 | B | (12+) | 465.9 2 | 100 | E2 | 1939.7 | (10+) | |
| 2598.3 5 | B | (13-) | 192.7 2 | 100 | E1 | 2405.6 | (12+) | |
| 2826.1 5 | B | (14+) | 227.9 2 420.5 2 | 18.6 21 100 12 | E1 E2 | 2598.3 2405.6 | (13-) (12+) | |
| 2965.4 6 | B | 622.9 2 | 100 | 2342.5 | ||||
| 3072.1 6 | B | (15-) | 246.0 2 473.9 2 | 72 6 100 13 | E1 | 2826.1 2598.3 | (14+) (13-) | |
| 3238.3 6 | B | (16+) | 166.1 2 412.1 2 | 7.3 11 100 8 | D Q | 3072.1 2826.1 | (15-) (14+) | |
| 3469.4 6 | B | (17-) | 231.2 2 397.4 2 | 93 6 100 12 | D Q | 3238.3 3072.1 | (16+) (15-) | |
| 3572.4 6 | B | (18+) | 333.9 2 | 100 | E2 | 3238.3 | (16+) | |
| 3779.7 6 | B | (19-) | 207.5 2 310.5 2 | 18 4 100 13 | D Q | 3572.4 3469.4 | (18+) (17-) | |
| 4071.8 6 | B | 292.7 2 498.9 2 | 100 20 72 13 | 3779.7 3572.4 | (19-) (18+) | |||
| 4300.2 6 | B | 520.5 2 | 100 | 3779.7 | (19-) | |||
E(level): From least-squares fit to Eγ
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Ground-state band | |||||||
| 0.0 | 0+ | 45 µs 4 % α = 100 | |||||
| 461.40 20 | 2+ | 461.4 2 | 100 | E2 | 0.0 | 0+ | |
| 840.5 3 | (4+) | 379.1 2 | 100 | E2 | 461.40 | 2+ | |
| 1225.9 4 | (6+) | 385.4 2 | 100 | E2 | 840.5 | (4+) | |
| 1645.0 4 | (8+) | 419.1 2 | 100 | E2 | 1225.9 | (6+) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - 12+ band. | |||||||
| 2405.6 5 | (12+) | ||||||
| 2826.1 5 | (14+) | 227.9 2 420.5 2 | 18.6 21 100 12 | E1 E2 | 2598.3 2405.6 | (13-) (12+) | |
| 3238.3 6 | (16+) | 166.1 2 412.1 2 | 7.3 11 100 8 | D Q | 3072.1 2826.1 | (15-) (14+) | |
| 3572.4 6 | (18+) | 333.9 2 | 100 | E2 | 3238.3 | (16+) | |
| 4071.8 6 | 292.7 2 498.9 2 | 100 20 72 13 | 3779.7 3572.4 | (19-) (18+) | |||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 3 - 13- band. | |||||||
| 2598.3 5 | (13-) | ||||||
| 3072.1 6 | (15-) | 246.0 2 473.9 2 | 72 6 100 13 | E1 | 2826.1 2598.3 | (14+) (13-) | |
| 3469.4 6 | (17-) | 231.2 2 397.4 2 | 93 6 100 12 | D Q | 3238.3 3072.1 | (16+) (15-) | |
| 3779.7 6 | (19-) | 207.5 2 310.5 2 | 18 4 100 13 | D Q | 3572.4 3469.4 | (18+) (17-) | |
| 4300.2 6 | 520.5 2 | 100 | 3779.7 | (19-) | |||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 461.40 | 2+ | 461.4 2 | E2 | 0.0427 | α=0.0427 6, α(K)=0.0278 4, α(L)=0.01116 16, α(M)=0.00285 4, α(N)=0.000743 10, α(O)=0.0001554 22, α(P)=1.974×10-5 28 | |
| 840.5 | (4+) | 379.1 2 | E2 | 0.0709 | α=0.0709 10, α(K)=0.0417 6, α(L)=0.02170 31, α(M)=0.00562 8, α(N)=0.001464 21, α(O)=0.000304 4, α(P)=3.76×10-5 5 | |
| 1225.9 | (6+) | 385.4 2 | E2 | 0.0678 | α=0.0678 10, α(K)=0.0403 6, α(L)=0.02048 29, α(M)=0.00530 7, α(N)=0.001381 19, α(O)=0.000287 4, α(P)=3.55×10-5 5 | |
| 1645.0 | (8+) | 419.1 2 | E2 | 0.0544 | α=0.0544 8, α(K)=0.0338 5, α(L)=0.01535 22, α(M)=0.00395 6, α(N)=0.001029 15, α(O)=0.0002143 30, α(P)=2.69×10-5 4 | |
| 1939.7 | (10+) | 102.2 2 | 7.62 | α=7.62 13 | ||
| (10+) | 294.7 2 | E2 | 0.1456 | α=0.1456 21, α(K)=0.0716 10, α(L)=0.0549 8, α(M)=0.01445 21, α(N)=0.00376 5, α(O)=0.000774 11, α(P)=9.26×10-5 13 | ||
| 2405.6 | (12+) | 465.9 2 | E2 | 0.0417 | α=0.0417 6, α(K)=0.0272 4, α(L)=0.01082 15, α(M)=0.00276 4, α(N)=0.000720 10, α(O)=0.0001505 21, α(P)=1.915×10-5 27 | |
| 2598.3 | (13-) | 192.7 2 | E1 | 0.0942 | α=0.0942 13, α(K)=0.0754 11, α(L)=0.01424 20, α(M)=0.00339 5, α(N)=0.000873 12, α(O)=0.0001853 26, α(P)=2.488×10-5 35 | |
| 2826.1 | (14+) | 227.9 2 | E1 | 0.0630 | α=0.0630 9, α(K)=0.0507 7, α(L)=0.00935 13, α(M)=0.002218 31, α(N)=0.000573 8, α(O)=0.0001220 17, α(P)=1.655×10-5 23 | |
| (14+) | 420.5 2 | E2 | 0.0540 | α=0.0540 8, α(K)=0.0336 5, α(L)=0.01518 21, α(M)=0.00391 6, α(N)=0.001017 14, α(O)=0.0002119 30, α(P)=2.66×10-5 4 | ||
| 3072.1 | (15-) | 246.0 2 | E1 | 0.0526 | α=0.0526 7, α(K)=0.0424 6, α(L)=0.00774 11, α(M)=0.001835 26, α(N)=0.000474 7, α(O)=0.0001011 14, α(P)=1.379×10-5 19 | |
| (15-) | 473.9 2 | 0.0400 | α=0.0400 6 | |||
| 3572.4 | (18+) | 333.9 2 | E2 | 0.1008 | α=0.1008 14, α(K)=0.0547 8, α(L)=0.0343 5, α(M)=0.00896 13, α(N)=0.002333 33, α(O)=0.000482 7, α(P)=5.86×10-5 8 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 45 µs 4 % α = 100 | E(level): Ground-state band. |
| 461.40 | 2+ | E(level): Ground-state band. | |
| 840.5 | (4+) | E(level): Ground-state band. | |
| 1225.9 | (6+) | E(level): Ground-state band. | |
| 1645.0 | (8+) | E(level): Ground-state band. | |
| 1837.5 | 2006De09 tentatively assign J=(8-10) and positive parity to this state, but while the populating and depopulating transitions are reported to be electric, it does not seem clear that they can be definitively assigned quadrupole multipolarity. Therefore, no spin-parity is adopted here. E(level): 2006De09 tentatively assign J=(8-10) and positive parity to this state, but while the populating and depopulating transitions are reported to be electric, it does not seem clear that they can be definitively assigned quadrupole multipolarity. Therefore, no spin-parity is adopted here. | ||
| 1939.7 | (10+) | configuration=πh9/24νg9/23νi11/2 (2006De09). | |
| 2405.6 | (12+) | E(level): 12+ band. | |
| 2598.3 | (13-) | E(level): 13- band. | |
| 2826.1 | (14+) | E(level): 12+ band. | |
| 3072.1 | (15-) | E(level): 13- band. | |
| 3238.3 | (16+) | E(level): 12+ band. Jπ(level): From the (16+) level upward, the Jπ assignments are based on the observed opposite-parity band structure. | |
| 3469.4 | (17-) | E(level): 13- band. Jπ(level): From the (16+) level upward, the Jπ assignments are based on the observed opposite-parity band structure. | |
| 3572.4 | (18+) | E(level): 12+ band. Jπ(level): From the (16+) level upward, the Jπ assignments are based on the observed opposite-parity band structure. | |
| 3779.7 | (19-) | E(level): 13- band. Jπ(level): From the (16+) level upward, the Jπ assignments are based on the observed opposite-parity band structure. | |
| 4071.8 | E(level): 12+ band. | ||
| 4300.2 | E(level): 13- band. |
| E(level) | E(gamma) | Comments |
| 461.40 | 461.4 | M(γ): Stretched Q transition from γ(θ) in 1987Co11; π from level scheme. |
| 840.5 | 379.1 | M(γ): Determined to be quadrupole by γ-ray anisotropy measurements in 2006De09. M2 ruled out during evaluation as it would imply that Iγ+c.e. exceeds that depopulating the level below. |
| 1225.9 | 385.4 | M(γ): Stretched character from γ-ray angular distribution measurement (1987Co11). Determined to be quadrupole by γ-ray anisotropy measurements in 2006De09. M2 ruled out during evaluation as it would imply that Iγ+c.e. exceeds that depopulating the level below. |
| 1645.0 | 419.1 | M(γ): Determined to be quadrupole by γ-ray anisotropy measurements in 2006De09. M2 ruled out during evaluation as it would imply that Iγ+c.e. exceeds that depopulating the level below. |
| 1837.5 | 192.5 | E(γ): 102.2- and 192.5-keV γ rays are in cascade from a 1939.7-keV 10+ level, through a level at either 1747.2 keV or 1837.5 keV, to the 1645.0 keV state. The former possibility is adopted following the level scheme of 2006De09. |
| 1939.7 | 102.2 | E(γ): 102.2- and 192.5-keV γ rays are in cascade from a 1939.7-keV 10+ level, through a level at either 1747.2 keV or 1837.5 keV, to the 1645.0 keV state. The former possibility is adopted following the level scheme of 2006De09. | 294.7 | M(γ): Dipole or quadrupole nature determined by γ-ray anisotropy measurements in 2006De09. Electric character determined by intensity balance at each level by 2006De09. |
| 2405.6 | 465.9 | M(γ): Determined to be quadrupole by γ-ray anisotropy measurements in 2006De09. M2 ruled out during evaluation as it would imply that Iγ+c.e. exceeds that depopulating the level below. |
| 2598.3 | 192.7 | M(γ): Dipole or quadrupole nature determined by γ-ray anisotropy measurements in 2006De09. Electric character determined by intensity balance at each level by 2006De09. |
| 2826.1 | 227.9 | M(γ): Dipole or quadrupole nature determined by γ-ray anisotropy measurements in 2006De09. Electric character determined by intensity balance at each level by 2006De09. | 420.5 | M(γ): Q from γ-ray anisotropy in 208Pb(18O,2α2nγ); electric character required by parallel E1-E1 cascade to 12+ level. |
| 3072.1 | 246.0 | M(γ): Dipole or quadrupole nature determined by γ-ray anisotropy measurements in 2006De09. Electric character determined by intensity balance at each level by 2006De09. |
| 3238.3 | 166.1 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) | 412.1 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) |
| 3469.4 | 231.2 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) | 397.4 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) |
| 3572.4 | 333.9 | M(γ): Dipole or quadrupole nature determined by γ-ray anisotropy measurements in 2006De09. Electric character determined by intensity balance at each level by 2006De09. |
| 3779.7 | 207.5 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) | 310.5 | M(γ): From γ-ray anisotropy measurements in 208Pb(18O,2α2nγ) |