ADOPTED LEVELS, GAMMAS for 225Ac
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 25-OCT-2019
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-673 keV 7 | S(n)= 6668 keV 6 | S(p)= 4478 keV 5 | Q(α)= 5935.1 keV 14 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 225Ra β- decay (14.9 d) | B | 229Pa α decay (1.50 d) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | AB | (3/2-) | 9.920 d 3 % α = 100 % 14C = 5.3×10-10 13 | |||||
| 29.91 6 | B | (5/2-) | 30.0 2 | 100 | [M1] | 0.0 | (3/2-) | |
| 40.10 4 | AB | (3/2+) | 0.72 ns 3 | 40.09 5 | 100 | E1 | 0.0 | (3/2-) |
| 64.69 5 | B | (5/2+) | 24.6? 34.8 1 64.70 5 | ≈5 100 9 | [E1] [E1] | 40.10 29.91 0.0 | (3/2+) (5/2-) (3/2-) | |
| 77.13 9 | B | (7/2-) | ||||||
| 105.01 7 | B | (7/2+) | 75.12 5 | 100 9 | [E1] | 29.91 | (5/2-) | |
| 120.81 4 | AB | (5/2-) | 80.6 1 120.80 5 | 5.0 9 100 9 | [E1] M1(+E2) | 40.10 0.0 | (3/2+) (3/2-) | |
| 144.96 9 | B | (9/2+) | 67.80 5 | 100 9 | [E1] | 77.13 | (7/2-) | |
| 155.64 5 | AB | (5/2+) | 34.8 1 115.55 5 125.71 7 155.65 7 | ≈13 100 8 19.5 19 ≈5 | [E1] M1 [E1] [E1] | 120.81 40.10 29.91 0.0 | (5/2-) (3/2+) (5/2-) (3/2-) | |
| 170.75 8 | B | (7/2-) | 93.6 1 140.85 7 | 47 7 100 12 | [M1+E2] [M1+E2] | 77.13 29.91 | (7/2-) (5/2-) | |
| 199.86 6 | B | (7/2+) | 79.00 7 94.86 7 122.8 1 135.20 7 169.9 1 | 50 5 62 7 24 3 100 10 56 7 | [E1] [M1] [E1] [M1] [E1] | 120.81 105.01 77.13 64.69 29.91 | (5/2-) (7/2+) (7/2-) (5/2+) (5/2-) | |
| 221 7 | B | |||||||
| 235.53 13 | B | (9/2-) | 158.4 1 | 100 | [M1] | 77.13 | (7/2-) | |
| 256.97 9 | B | (9/2+) | 111.9 1 152.0 1 179.9 1 | 100 17 92 17 67 17 | [M1] [M1] [E1] | 144.96 105.01 77.13 | (9/2+) (7/2+) (7/2-) | |
| ≈318? | B | |||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 327 7 | B | |||||||
| 421 7 ? | B | |||||||
E(level): From 229Pa α decay
Jπ(level): From probable band assignments, in addition to some other arguments
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - π3/2[532] band. | |||||||
| 0.0 | (3/2-) | 9.920 d 3 % α = 100 % 14C = 5.3×10-10 13 | |||||
| 29.91 6 | (5/2-) | 30.0 2 | 100 | [M1] | 0.0 | (3/2-) | |
| 77.13 9 | (7/2-) | ||||||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 2 - π3/2[651] band. | |||||||
| 40.10 4 | (3/2+) | 0.72 ns 3 | |||||
| 64.69 5 | (5/2+) | 24.6? 34.8 1 64.70 5 | ≈5 100 9 | [E1] [E1] | 40.10 29.91 0.0 | (3/2+) (5/2-) (3/2-) | |
| 105.01 7 | (7/2+) | 75.12 5 | 100 9 | [E1] | 29.91 | (5/2-) | |
| 144.96 9 | (9/2+) | 67.80 5 | 100 9 | [E1] | 77.13 | (7/2-) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 3 - π5/2[523] band. | |||||||
| 120.81 4 | (5/2-) | ||||||
| 170.75 8 | (7/2-) | 93.6 1 140.85 7 | 47 7 100 12 | [M1+E2] [M1+E2] | 77.13 29.91 | (7/2-) (5/2-) | |
| 235.53 13 | (9/2-) | 158.4 1 | 100 | [M1] | 77.13 | (7/2-) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 4 - π5/2[642] band. | |||||||
| 155.64 5 | (5/2+) | ||||||
| 199.86 6 | (7/2+) | 79.00 7 94.86 7 122.8 1 135.20 7 169.9 1 | 50 5 62 7 24 3 100 10 56 7 | [E1] [M1] [E1] [M1] [E1] | 120.81 105.01 77.13 64.69 29.91 | (5/2-) (7/2+) (7/2-) (5/2+) (5/2-) | |
| 256.97 9 | (9/2+) | 111.9 1 152.0 1 179.9 1 | 100 17 92 17 67 17 | [M1] [M1] [E1] | 144.96 105.01 77.13 | (9/2+) (7/2+) (7/2-) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 29.91 | (5/2-) | 30.0 2 | [M1] | 117 | α=117 | ||
| 40.10 | (3/2+) | 0.72 ns 3 | 40.09 5 | E1 | 1.293 | B(E1)(W.u.)=0.00171 15, α=1.293 | |
| 64.69 | (5/2+) | 34.8 1 | [E1] | 1.88 | α=1.88 | ||
| (5/2+) | 64.70 5 | [E1] | 0.362 | α=0.362 | |||
| 105.01 | (7/2+) | 75.12 5 | [E1] | 0.243 | α=0.243 | ||
| 120.81 | (5/2-) | 80.6 1 | [E1] | 0.202 | α=0.202 | ||
| (5/2-) | 120.80 5 | M1(+E2) | 0.5 5 | 8.9 | α=8.9 16 | ||
| 144.96 | (9/2+) | 67.80 5 | [E1] | 0.319 | α=0.319 | ||
| 155.64 | (5/2+) | 34.8 1 | [E1] | 1.88 | α=1.88 | ||
| (5/2+) | 115.55 5 | M1 | 11.28 | α=11.28 | |||
| (5/2+) | 125.71 7 | [E1] | 0.281 | α=0.281 | |||
| (5/2+) | 155.65 7 | [E1] | 0.1680 | α=0.1680 | |||
| 170.75 | (7/2-) | 93.6 1 | [M1+E2] | 6.2 | α=6.2 30 | ||
| (7/2-) | 140.85 7 | [M1+E2] | 5.6 | α=5.6 12 | |||
| 199.86 | (7/2+) | 79.00 7 | [E1] | 0.213 | α=0.213 | ||
| (7/2+) | 94.86 7 | [M1] | 4.00 | α=4.00 | |||
| (7/2+) | 122.8 1 | [E1] | 0.297 | α=0.297 | |||
| (7/2+) | 135.20 7 | [M1] | 7.22 | α=7.22 | |||
| (7/2+) | 169.9 1 | [E1] | 0.1362 | α=0.1362 | |||
| 235.53 | (9/2-) | 158.4 1 | [M1] | 4.61 | α=4.61 | ||
| 256.97 | (9/2+) | 111.9 1 | [M1] | 12.33 | α=12.33 | ||
| (9/2+) | 152.0 1 | [M1] | 5.18 | α=5.18 | |||
| (9/2+) | 179.9 1 | [E1] | 0.1187 | α=0.1187 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3/2-) | 9.920 d 3 % α = 100 % 14C = 5.3×10-10 13 | 2001Gu33: 14C decay mode measurement at the CERN-ISOLDE mass-separator at CERN and nuclear track detector technique; |l(14C)/|l(α)=4.5×10-12 14 or partial T1/2(14C)=1.9×1017 s 6 (2001Gu33). 1993Bo26 measured |l(14C)/|l(α)=6.0×10-10 13 at CERN-ISOLDE. Hindrance factor as defined in 2001Gu33 is about unity for 14C decay of 225Ac, much lower than typical hindrance factor of 10-100 for other known cluster decays. This represents a case of a favored cluster decay. Adopted value of %14C decay is the average of the values from 2001Gu33 and 1993Bo26, with corresponding partial T1/2=1.6×1017 s 4. E(level): 2001Gu33: 14C decay mode measurement at the CERN-ISOLDE mass-separator at CERN and nuclear track detector technique; |l(14C)/|l(α)=4.5×10-12 14 or partial T1/2(14C)=1.9×1017 s 6 (2001Gu33). 1993Bo26 measured |l(14C)/|l(α)=6.0×10-10 13 at CERN-ISOLDE. Hindrance factor as defined in 2001Gu33 is about unity for 14C decay of 225Ac, much lower than typical hindrance factor of 10-100 for other known cluster decays. This represents a case of a favored cluster decay. Adopted value of %14C decay is the average of the values from 2001Gu33 and 1993Bo26, with corresponding partial T1/2=1.6×1017 s 4. π3/2[532] band. |
| 29.91 | (5/2-) | E(level): π3/2[532] band. | |
| 40.10 | (3/2+) | 0.72 ns 3 | E(level): π3/2[651] band. |
| 64.69 | (5/2+) | E(level): π3/2[651] band. | |
| 77.13 | (7/2-) | E(level): π3/2[532] band. | |
| 105.01 | (7/2+) | E(level): π3/2[651] band. | |
| 120.81 | (5/2-) | XREF: α(?). E(level): π5/2[523] band. | |
| 144.96 | (9/2+) | E(level): π3/2[651] band. | |
| 155.64 | (5/2+) | XREF: α(?). E(level): π5/2[642] band. | |
| 170.75 | (7/2-) | E(level): π5/2[523] band. | |
| 199.86 | (7/2+) | E(level): π5/2[642] band. | |
| 235.53 | (9/2-) | E(level): π5/2[523] band. | |
| 256.97 | (9/2+) | E(level): π5/2[642] band. |
| E(level) | E(gamma) | Comments |
| 29.91 | 30.0 | E(γ): from αγ-coin (1973Ag01) in α decay. Note that 1987Ah05 interpreted this γ-ray peak as an escape line in their αγ-coin spectrum. |
| 40.10 | 40.09 | M(γ): from L-subshell ratios in 225Ra β- decay. |
| 64.69 | 34.8 | E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided |
| 155.64 | 34.8 | E(γ): Multiply placed with intensity suitably divided I(γ): Multiply placed with intensity suitably divided |
1947En03, 1947Ha02: 225Ac identified from decay product of 233U series.
1950Ha52: chemical separation of 225Ac.
1972Ku26: fission isomer not observed in 226Ra(d,3n),E=11.3 MeV
1988Le13: level energies were calculated for a deformed shell model (including octupole deformation) coupled to a reflection-asymmetric rotor core. The quadrupole deformation of β2=0.144 was used in calculations, and an octupole deformation of β3≈0.1 was suggested.
Theoretical studies: consult the NSR database at www.nndc.bnl.gov for 14 references dealing with theoretical calculations for structure (levels, Jπ, transition probabilities, etc.), and 62 for radioactive decay modes, in particular about 14C cluster emission.
Q-value: S(2n)=12331 8, S(2p)=11323 5 (2017Wa10)