ADOPTED LEVELS, GAMMAS for 212Ra
Authors: K. Auranen and E.A. Mccutchan | Citation: Nucl. Data Sheets 168, 117 (2020) | Cutoff date: 1-Aug-2020
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-7480 keV 50 | S(n)= 9102 keV 14 | S(p)= 3348 keV 16 | Q(α)= 7031.7 keV 17 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 216Th α decay (26.0 MS) | B | 216Th α decay (133 μs) |
| C | 204Pb(12C,4nγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABC | 0+ | 13.0 s 2 % ε < 15 % α > 85 | |||||
| 629.30 10 | ABC | 2+ | 629.3 1 | 100 | E2 | 0.0 | 0+ | |
| 1454.30 22 | BC | 4+ | 825.0 2 | 100 | E2 | 629.30 | 2+ | |
| 1895.10 24 | BC | 6+ | 440.8 1 | 100 | E2 | 1454.30 | 4+ | |
| 1958.4 20 | BC | 8+ | 9.3 µs 9 | 63.3 20 | 100 | [E2] | 1895.10 | 6+ |
| 2108.4 20 | C | 8+ | 150.0 2 | 100 | 1958.4 | 8+ | ||
| 2577.2 20 | C | 10+ | 618.8 1 | 100 | E2 | 1958.4 | 8+ | |
| 2613.3 20 | C | 11- | 0.85 µs 13 | 36.1S 504.9 2 654.9 2 | 57 7 100 8 86 8 | [E1] E3 E3 | 2577.2 2108.4 1958.4 | 10+ 8+ 8+ |
| 2699.7 20 | C | 12+ | 122.5 1 | 100 | E2 | 2577.2 | 10+ | |
| 3121.6 20 | C | 12- | 508.3 1 | 100 | D+Q | 2613.3 | 11- | |
| 3404.2 20 | C | 13- | 282.5 1 791.0 1 | 58 8 100 15 | M1 E2 | 3121.6 2613.3 | 12- 11- | |
| 3602.4 20 | C | 1025.2 2 | 100 | 2577.2 | 10+ | |||
| 3631.8 20 | C | (13-) | 29.4S 932.0 1 | | 3602.4 2699.7 | 12+ | ||
| 3949.0 20 | C | (14-) | 317.3 1 544.8 1 | 18 4 100 13 | M1 D | 3631.8 3404.2 | (13-) 13- | |
| 4107.2 20 | C | 15- | 475.2 2 703.1 1 | 63 15 100 24 | E2 | 3631.8 3404.2 | (13-) 13- | |
| 4197.8 20 | C | (16-) | 90.6S 248.8 1 | | E2 | 4107.2 3949.0 | 15- (14-) | |
| 4350.9 20 | C | (17-) | 153.1 2 | 100 | M1 | 4197.8 | (16-) | |
| 4552.6 20 | C | (18-) | 201.7 1 | 100 | M1+E2 | 4350.9 | (17-) | |
| 5043.5 20 | C | (19+) | 21.5 ns 21 | 490.9 1 | 100 | (E1) | 4552.6 | (18-) |
| 5125.0 20 | C | 774.1 1 | 100 | 4350.9 | (17-) | |||
| 5414.7 20 | C | 289.7 1 371.1 1 | 100 16 94 17 | 5125.0 5043.5 | (19+) | |||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 5877.1 20 | C | 462.4 1 833.7 1 | 89 17 100 22 | 5414.7 5043.5 | (19+) | |||
| 6137.8 20 | C | 260.6 1 | 100 | 5877.1 | ||||
| 6370.3 20 | C | 493.1 2 | 100 | 5877.1 | ||||
E(level): From a least square fit to the Eγ data.
Jπ(level): From excited levels, based on measured multipolarities of transitions. For states populated in 204Pb(12C,4nγ) reaction there is the assumption of increasing spin with increasing excitation energy.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 629.30 | 2+ | 629.3 1 | E2 | 0.023 | α=0.023 0, α(K)=0.01624 23, α(L)=0.00504 7, α(M)=0.001273 18, α(N)=0.000336 5, α(O)=7.43×10-5 11, α(P)=1.208E-5 17, α(Q)=5.78E-7 8 | ||
| 1454.30 | 4+ | 825.0 2 | E2 | 0.01311 | α=0.01311, α(K)=0.00985 14, α(L)=0.00245 4, α(M)=0.000607 9, α(N)=0.0001599 23, α(O)=3.57×10-5 5, α(P)=5.93E-6 9, α(Q)=3.40E-7 5 | ||
| 1895.10 | 6+ | 440.8 1 | E2 | 0.0526 | α=0.0526, α(K)=0.0323 5, α(L)=0.01508 22, α(M)=0.00391 6, α(N)=0.001032 15, α(O)=0.000226 4, α(P)=3.55×10-5 5, α(Q)=1.205E-6 17 | ||
| 1958.4 | 8+ | 9.3 µs 9 | 63.3 20 | [E2] | 84 | B(E2)(W.u.)=0.0094 +30-20, α=84 14, α(L)=61 11, α(M)=17 3, α(N)=4.4 8, α(O)=0.93 16, α(P)=0.134 23, α(Q)=0.00032 5 | |
| 2577.2 | 10+ | 618.8 1 | E2 | 0.0238 | α=0.0238, α(K)=0.01676 24, α(L)=0.00529 8, α(M)=0.001337 19, α(N)=0.000353 5, α(O)=7.80×10-5 11, α(P)=1.266E-5 18, α(Q)=5.98E-7 9 | ||
| 2613.3 | 11- | 0.85 µs 13 | 36.1 | [E1] | 1.67 | B(E1)(W.u.)=7.6E-7 +15-12, α=1.67 5, α(L)=1.26 4, α(M)=0.312 9, α(N)=0.0800 22, α(O)=0.0166 5, α(P)=0.00228 6, α(Q)=7.95E-5 18 | |
| 11- | 0.85 µs 13 | 504.9 2 | E3 | 0.1352 | B(E3)(W.u.)=18 4, α=0.1352, α(K)=0.0617 9, α(L)=0.0541 8, α(M)=0.01454 21, α(N)=0.00386 6, α(O)=0.000842 12, α(P)=0.0001312 19, α(Q)=3.47E-6 5 | ||
| 11- | 0.85 µs 13 | 654.9 2 | E3 | 0.0625 | B(E3)(W.u.)=2.5 5, α=0.0625, α(K)=0.0358 5, α(L)=0.0198 3, α(M)=0.00521 8, α(N)=0.001381 20, α(O)=0.000304 5, α(P)=4.83E-5 7, α(Q)=1.734E-6 25 | ||
| 2699.7 | 12+ | 122.5 1 | E2 | 4.03 | α=4.03, α(K)=0.309 5, α(L)=2.74 4, α(M)=0.745 11, α(N)=0.197 3, α(O)=0.0419 6, α(P)=0.00609 9, α(Q)=2.87×10-5 4 | ||
| 3404.2 | 13- | 282.5 1 | M1 | 0.837 | α=0.837, α(K)=0.673 10, α(L)=0.1237 18, α(M)=0.0295 5, α(N)=0.00779 11, α(O)=0.001777 25, α(P)=0.000310 5, α(Q)=2.43×10-5 4 | ||
| 13- | 791.0 1 | E2 | 0.01426 | α=0.01426, α(K)=0.01063 15, α(L)=0.00273 4, α(M)=0.000677 10, α(N)=0.0001784 25, α(O)=3.98×10-5 6, α(P)=6.59E-6 10, α(Q)=3.69E-7 6 | |||
| 3949.0 | (14-) | 317.3 1 | M1 | 0.608 | α=0.608, α(K)=0.490 7, α(L)=0.0897 13, α(M)=0.0214 3, α(N)=0.00565 8, α(O)=0.001288 18, α(P)=0.000225 4, α(Q)=1.760×10-5 25 | ||
| 4107.2 | 15- | 703.1 1 | E2 | 0.0182 | α=0.0182, α(K)=0.01321 19, α(L)=0.00371 6, α(M)=0.000929 13, α(N)=0.000245 4, α(O)=5.45×10-5 8, α(P)=8.94E-6 13, α(Q)=4.64E-7 7 | ||
| 4197.8 | (16-) | 248.8 1 | E2 | 0.275 | α=0.275, α(K)=0.1045 15, α(L)=0.1257 18, α(M)=0.0337 5, α(N)=0.00889 13, α(O)=0.00191 3, α(P)=0.000287 4, α(Q)=4.37×10-6 7 | ||
| 4350.9 | (17-) | 153.1 2 | M1 | 4.65 | α=4.65, α(K)=3.73 6, α(L)=0.694 10, α(M)=0.1658 24, α(N)=0.0437 7, α(O)=0.00997 15, α(P)=0.00174 3, α(Q)=0.0001363 20 | ||
| 4552.6 | (18-) | 201.7 1 | M1+E2 | 0.43 +12-13 | |||
| 5043.5 | (19+) | 21.5 ns 21 | 490.9 1 | (E1) | 0.01224 | B(E1)(W.u.)=7.4E-8 8, α=0.01224, α(K)=0.00998 14, α(L)=0.001719 24, α(M)=0.000407 6, α(N)=0.0001066 15, α(O)=2.40E-5 4, α(P)=4.08E-6 6, α(Q)=2.87E-7 4 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 0+ | 13.0 s 2 % ε < 15 % α > 85 | RMS charge radius <r2>1/2=5.599 fm 18 (2013An02). |
| 629.30 | 2+ | Possible configuration πh9/26~#νp1/2-1f5/2-1, but the shell model level energy is 600 keV above the experimental one, possibly indicating configuration mixing. E(level): Possible configuration πh9/26~#νp1/2-1f5/2-1, but the shell model level energy is 600 keV above the experimental one, possibly indicating configuration mixing. | |
| 1895.10 | 6+ | Configuration πh9/26~#νp1/2-2. | |
| 1958.4 | 8+ | 9.3 µs 9 | μ=7.104 72 (1986Ko01) XREF: B(1967). |
| 2108.4 | 8+ | Configuration πh9/25f7/2~#νp1/2-2. | |
| 5043.5 | (19+) | 21.5 ns 21 | Configuration πh9/24i13/22~#νp1/2-2. |
| E(level) | E(gamma) | Comments |
| 629.30 | 629.3 | E(γ): From 216Th α decay (133 μs) |
| 1454.30 | 825.0 | E(γ): From 216Th α decay (133 μs) |
| 1895.10 | 440.8 | E(γ): From 216Th α decay (133 μs) |
| 1958.4 | 63.3 | E(γ): 1986Ko01 observed ce(L) and ce(M), energy uncertainty not given, |+2 keV assumed by the evaluator for further fitting. |
| 2613.3 | 36.1 | E(γ): Transition not observed, but suggested by the γγ-coincidence analysis of 2018Pa01. Eγ deduced by the evaluators from level energy differences. I(γ): Deduced by the evaluator from the intensity balance of the 2577 keV level assuming no direct feeding and that I(γ+ce)(123)=I(γ+ce)(932), i.e. I(γ+ce)(36) = I(γ+ce)(618)-I(γ+ce)(1025)-I(γ+ce)(932). Similar, but less precise value of I(γ)(36)=56 14 was obtained from the intensity balance of the 2613 keV level. |
| 3631.8 | 29.4 | E(γ): Transition not observed, but suggested by the γγ-coincidence analysis of 2018Pa01. Eγ deduced by the evaluators from level energy differences. |
| 4197.8 | 90.6 | E(γ): Transition not observed, but suggested by the γγ-coincidence analysis of 2018Pa01. Eγ deduced by the evaluators from level energy differences. |
2018Ro14: mass measurement, mass excess = -198.1 keV 248 compared with -199.0 keV 113 in AME-2016 (2017Wa10).
Levels: The adopted level scheme and γ-ray data is largely that proposed and observed in 2018Pa04. It is based on Eγ, Iγ, γγ, γ(θ), γ(t), and α(tot) measurements. The configurations are assigned based on semiempirical shell-model calculations. Some details are supplemented by data from the earlier studies, as indicated.
Q-value: S(2n)=16784 14; S(2p)=5172 12; Q(εp)=1267 13 (2017Wa10).