ADOPTED LEVELS, GAMMAS for 217Ac
Authors: B. Singh, A. Chakraborty, S. Bhattacharya | Citation: Nucl. Data Sheets 147, 382 (2018) | Cutoff date: 1-DEC-2017
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-3502 keV 16 | S(n)= 7512 keV 16 | S(p)= 1876 keV 14 | Q(α)= 9832 keV 10 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 217Ac IT decay (740 NS) | B | 221Pa α decay (5.9 μs) |
| C | 209Bi(12C,4nγ):DELAYED γ | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABC | 9/2- | 69 ns 4 % α = 100 % ε < 2 | |||||
| 660.2 3 | A C | 13/2- | 660.3 | 100 | E2 | 0.0 | 9/2- | |
| 670.2 3 | A C | 11/2- | 670.1 | 100 | M1+E2 | 0.0 | 9/2- | |
| 1146.6 4 | A C | 17/2- | % α ≤ 0.27 4 | 486.4 | 100 | E2 | 660.2 | 13/2- |
| 1149.1 3 | A C | 15/2- | % α ≤ 0.27 4 | 478.9 489 | 100 25 75 25 | E2 M1(+E2) | 670.2 660.2 | 11/2- 13/2- |
| 1498.1 4 | A C | 19/2- | % α ≤ 0.46 13 | 349.0 351.5 | 76 10 100 10 | E2 M1+E2 | 1149.1 1146.6 | 15/2- 17/2- |
| 1528.4 5 | A C | (21/2)- | < 10 ns % α ≤ 0.46 13 | 30.3 6 S 381.8 | 0.9 1 100 11 | [M1] E2 | 1498.1 1146.6 | 19/2- 17/2- |
| 1682.2 6 | A C | (23/2)- | < 10 ns | 153.8 | 100 | M1+E2 | 1528.4 | (21/2)- |
| 1792.2 6 | A | (25/2)- | 110 | 100 | M1(+E2) | 1682.2 | (23/2)- | |
| 1916.2 6 | A | (27/2)- | 234 | 100 | E2 | 1682.2 | (23/2)- | |
| 2012.2 7 | A | (29/2)+ | 740 ns 40 % IT = 95.49 18 % α = 4.51 18 | 96 220 | 50 10 100 20 | E1+M2 M2 | 1916.2 1792.2 | (27/2)- (25/2)- |
E(level): From least-squares fit to Eγ data, assuming 0.3 keV uncertainty for each γ ray, except 1 keV when Eγ stated to nearest keV
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 660.2 | 13/2- | 660.3 | E2 | 0.0218 | α=0.0218, α(K)=0.01544 22, α(L)=0.00474 7, α(M)=0.001198 17, α(N)=0.000318 5, α(O)=7.20×10-5 11, α(P)=1.252E-5 18, α(Q)=6.89E-7 10 | ||
| 670.2 | 11/2- | 670.1 | M1+E2 | 0.055 | α=0.055 34, α(K)=0.043 29, α(L)=0.0088 43, α(M)=0.00213 98, α(N)=5.6×10-4 26, α(O)=1.30E-4 62, α(P)=2.4E-5 12, α(Q)=1.9E-6 13 | ||
| 1146.6 | 17/2- | % α ≤ 0.27 4 | 486.4 | E2 | 0.0434 | α=0.0434, α(K)=0.0275 4, α(L)=0.01181 17, α(M)=0.00305 5, α(N)=0.000811 12, α(O)=0.000182 3, α(P)=3.08×10-5 5, α(Q)=1.282E-6 18 | |
| 1149.1 | 15/2- | % α ≤ 0.27 4 | 478.9 | E2 | 0.0450 | α=0.0450, α(K)=0.0283 4, α(L)=0.01241 18, α(M)=0.00321 5, α(N)=0.000854 12, α(O)=0.000191 3, α(P)=3.24×10-5 5, α(Q)=1.324E-6 19 | |
| 15/2- | % α ≤ 0.27 4 | 489 | M1(+E2) | 1 LT | 0.16 | α=0.16 4, α(K)=0.130 35, α(L)=0.026 5, α(M)=0.0062 11, α(N)=0.0016 3, α(O)=0.00038 7, α(P)=7.0×10-5 14, α(Q)=5.8E-6 16 | |
| 1498.1 | 19/2- | % α ≤ 0.46 13 | 349.0 | E2 | 0.1028 | α=0.1028, α(K)=0.0529 8, α(L)=0.0369 6, α(M)=0.00975 14, α(N)=0.00259 4, α(O)=0.000576 9, α(P)=9.50×10-5 14, α(Q)=2.62E-6 4 | |
| 19/2- | % α ≤ 0.46 13 | 351.5 | M1+E2 | +0.65 +20-10 | 0.38 | α=0.38 5, α(K)=0.30 5, α(L)=0.063 5, α(M)=0.0154 11, α(N)=0.0041 3, α(O)=0.00094 7, α(P)=0.000171 14, α(Q)=1.34×10-5 19 | |
| 1528.4 | (21/2)- | < 10 ns % α ≤ 0.46 13 | 30.3 6 | [M1] | 114 | α=114 7, α(L)=86 6, α(M)=20.7 13, α(N)=5.5 4, α(O)=1.28 8, α(P)=0.236 15, α(Q)=0.0210 14 | |
| (21/2)- | < 10 ns % α ≤ 0.46 13 | 381.8 | E2 | 0.0803 | α=0.0803, α(K)=0.0442 7, α(L)=0.0267 4, α(M)=0.00702 10, α(N)=0.00187 3, α(O)=0.000415 6, α(P)=6.90×10-5 10, α(Q)=2.15E-6 3 | ||
| 1682.2 | (23/2)- | < 10 ns | 153.8 | M1+E2 | +0.39 8 | 4.57 | α=4.57 18, α(K)=3.52 20, α(L)=0.795 20, α(M)=0.195 7, α(N)=0.0518 17, α(O)=0.0119 4, α(P)=0.00214 5, α(Q)=0.000161 9 |
| 1792.2 | (25/2)- | 110 | M1(+E2) | 0.4 LT | 12.5 | α=12.5 6, α(K)=9.6 8, α(L)=2.17 22, α(M)=0.53 7, α(N)=0.141 17, α(O)=0.033 4, α(P)=0.0059 5, α(Q)=0.00045 4 | |
| 1916.2 | (27/2)- | 234 | E2 | 0.357 | α=0.357 8, α(K)=0.1185 20, α(L)=0.175 4, α(M)=0.0472 11, α(N)=0.0126 3, α(O)=0.00276 7, α(P)=0.000445 10, α(Q)=6.66×10-6 12 | ||
| 2012.2 | (29/2)+ | 740 ns 40 % IT = 95.49 18 % α = 4.51 18 | 96 | E1+M2 | 0.17 +5-6 | 2.0 | B(E1)(W.u.)=1.4E-8 9, B(M2)(W.u.)=0.20 17, α=2.0 12, α(L)=1.44 87, α(M)=0.39 24, α(N)=0.105 64, α(O)=0.024 15, α(P)=0.0043 27, α(Q)=3.2E-4 20 |
| (29/2)+ | 740 ns 40 % IT = 95.49 18 % α = 4.51 18 | 220 | M2 | 7.62 | B(M2)(W.u.)=0.21 6, α=7.62 17, α(K)=5.31 11, α(L)=1.72 4, α(M)=0.444 10, α(N)=0.120 3, α(O)=0.0277 7, α(P)=0.00501 12, α(Q)=0.000403 9 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | 9/2- | 69 ns 4 % α = 100 % ε < 2 | μ=+3.83 5 (1985De14,2014StZZ) No α decays from 217Ra or its descendants were observed by 1976No09; upper limit for ε+β+ decay was set as 2%. T1/2(ε+β+)≈1000 sec from gross β decay theory calculations of 1973Ta30. Therefore, prediction for ε+β+ decay branch is ≈6.9×10-9%. E(level): No α decays from 217Ra or its descendants were observed by 1976No09; upper limit for ε+β+ decay was set as 2%. T1/2(ε+β+)≈1000 sec from gross β decay theory calculations of 1973Ta30. Therefore, prediction for ε+β+ decay branch is ≈6.9×10-9%. |
| 1146.6 | 17/2- | % α ≤ 0.27 4 | 10780 15 α transition from 1147 and/or 1149 levels to 213Fr g.s. E(level): 10780 15 α transition from 1147 and/or 1149 levels to 213Fr g.s. |
| 1149.1 | 15/2- | % α ≤ 0.27 4 | 10780 15 α transition from 1147 and/or 1149 levels to 213Fr g.s. E(level): 10780 15 α transition from 1147 and/or 1149 levels to 213Fr g.s. |
| 1498.1 | 19/2- | % α ≤ 0.46 13 | 11137 15 α (a doublet) from 1498 and/or 1528 levels to 213Fr g.s. E(level): 11137 15 α (a doublet) from 1498 and/or 1528 levels to 213Fr g.s. |
| 1528.4 | (21/2)- | < 10 ns % α ≤ 0.46 13 | 11137 15 α (a doublet) from 1498 and/or 1528 levels to 213Fr g.s. E(level): 11137 15 α (a doublet) from 1498 and/or 1528 levels to 213Fr g.s. |
| 2012.2 | (29/2)+ | 740 ns 40 % IT = 95.49 18 % α = 4.51 18 | μ=+5.03 7 (1985De14,2014StZZ) 10541 1 α to an 1105 level in 213Fr (α in coincidence with 1105γ in 213Fr); 11137 15 α to a 498 level in 213Fr (α in coincidence with 498γ in 213Fr); 11625 17 α to 213Fr g.s. E(level): 10541 1 α to an 1105 level in 213Fr (α in coincidence with 1105γ in 213Fr); 11137 15 α to a 498 level in 213Fr (α in coincidence with 498γ in 213Fr); 11625 17 α to 213Fr g.s. |
| E(level) | E(gamma) | Comments |
| 1146.6 | 486.4 | M(γ): From ce data as well as γ(θ) data, M1 admixture is possible, however, based on the level scheme, mult=E2 is required |
| 1149.1 | 478.9 | M(γ): From ce data as well as γ(θ) data, M1 admixture is possible, however, based on the level scheme, mult=E2 is required |
| 1498.1 | 349.0 | M(γ): From ce data as well as γ(θ) data, M1 admixture is possible, however, based on the level scheme, mult=E2 is required |
| 1528.4 | 381.8 | M(γ): From ce data as well as γ(θ) data, M1 admixture is possible, however, based on the level scheme, mult=E2 is required |
| 1916.2 | 234 | M(γ): From ce data as well as γ(θ) data, M1 admixture is possible, however, based on the level scheme, mult=E2 is required |
| 2012.2 | 220 | M(γ): small E3 admixture is not excluded |
217Ac evaluated by B. Singh, α. Chakraborty and S. Bhattacharya
217Ac produced and identified by 1972No06, 1973No09 and 1973No02 in reactions: 207Pb(14N,4n) and 208Pb(14N,5n) at E=70-96 MeV at the cyclotron laboratory of the Institute of Physical and Chemical Research (now RIKEN); measured Eα, half-life of ground state and isomers in 217Ac, angular distribution of α particles
Decay scheme is basically as proposed by 1985De14 from their αγ-, γγ- and γ(ce) coincidences. In the level scheme shown by 1982GoZU, ordering of the 478.9 and 349.0 gammas was reversed, and their (486.4γ)(γ) coincidence spectrum indicates presence of the 349.0γ and absence of the 478.9γ. α 501.6-371.7-380.0-327.6 γ cascade was placed by 1983GoZX (also 1982GoZU) above the 1682 level, proposing levels at 3263, 2762, 2390 and 2010 keV, respectively. Due to the tentative nature of this unpublished work, these levels as well as a proposed 957 level are not adopted here, although, the data from this work can be found in the 209Bi(12C,4nγ) dataset.
Q-value: S(2n)=13470 17, S(2p)=6192 13 (2017Wa10)