ADOPTED LEVELS, GAMMAS for 224Ac
Authors: Balraj Singh, Sukhjeet Singh | Citation: ENSDF | Cutoff date: 08-Mar-2022
Authors: Sukhjeet Singh, Balraj Singh | Citation: Nucl. Data Sheets 130, 127 (2015) | Cutoff date: 15-Oct-2015
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=239 keV 10 | S(n)= 5662 keV 8 | S(p)= 4288 keV 4 | Q(α)= 6326.9 keV 7 | ||
Reference: 2021WA16 |
References: | |||
A | 228Pa α decay (19.5 H) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0 | A | (0-) | 2.78 h 16 % ε = 90.9 +14-20 % α = 9.1 +20-14 | |||||
17.60 15 | A | (1-) | ||||||
23.40 11 | A | (2-) | ||||||
29.83 9 | A | (1+) | 29.8 1 | 100 | E1 | 0 | (0-) | |
34.2 8 ? | A | |||||||
37.17 9 | A | (2-) | 37.2 1 ? | 100 | [E2] | 0 | (0-) | |
44.2 3 ? | A | |||||||
45.8 4 ? | A | (-) | ||||||
47.4 4 ? | A | |||||||
49.08 13 | A | (3-) | ||||||
52.20 11 | A | (2+) | 22S 28.8 1 34.6 1 | 42 7 100 11 | E1 E1 | 29.83 23.40 17.60 | (1+) (2-) (1-) | |
64.47 14 | A | (3+) | 41.1 1 | 100 | 23.40 | (2-) | ||
65.2 6 ? | A | |||||||
75.9 6 ? | A | |||||||
78.51 12 | A | (3-) | 26.3 1 | 100 14 | E1 | 52.20 | (2+) | |
80.49 10 | A | (3+) | 28.3 1 43.3 1 | ≈4.2 100 13 | E1 | 52.20 37.17 | (2+) (2-) | |
84.1 4 ? | A | |||||||
90.56 13 | A | (+) | 67.2 1 | 100 | (E1) | 23.40 | (2-) | |
92.6 4 ? | A | |||||||
100.44 23 ? | A | |||||||
103.31 13 | A | (4+) | 54.2 1 | 100 | (E1) | 49.08 | (3-) | |
105.1 6 ? | A | |||||||
109.33 17 | A | (4-) | 60.3 2 | 100 | 49.08 | (3-) | ||
110.53 15 | A | (+) | 61.5 1 | 100 | 49.08 | (3-) | ||
116.46 13 | A | (4-) | 36.0 1 52.0 2 | 100 15 87 15 | (E1) | 80.49 64.47 | (3+) (3+) | |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
130.30 11 | A | (4+) | 49.8 1 51.8 1 78.6 3 ? 81.2 1 | 20 4 100 11 8 4 89 15 | (E1) | 80.49 78.51 52.20 49.08 | (3+) (3-) (2+) (3-) | |
133.4 4 ? | A | |||||||
142.5 3 | A | (5+) | ||||||
146.6 4 | A | 62.5 1 ? | 100 17 | 84.1 | ||||
159.3 4 | A | 66.3 3 ? 75.5 3 ? | ≈50 ≈100 | 92.6 84.1 | ||||
169 2 | A | |||||||
176.72 14 | A | (5+) | 46.5 2 60.3 2 67.4 2 73.4 2 | ≈30 <125 100 15 21 9 | (E1) | 130.30 116.46 109.33 103.31 | (4+) (4-) (4-) (4+) | |
183.40 13 | A | (5-) | 53.1 1 74.1 3 80.1 1 | 100 15 38 10 85 15 | (E1) (E1) | 130.30 109.33 103.31 | (4+) (4-) (4+) | |
212 2 | A | |||||||
219.7 4 | A | 77.2 2 86.3 2 ? | ≈100 ≈67 | 142.5 133.4 | (5+) | |||
236.5 4 | A | (6-) | 59.8 3 | 100 | 176.72 | (5+) | ||
252.68 17 | A | (6+) | 69.3 2 76.0 2 110.3 4 122.5 5 | 100 17 43 12 86 17 ≈23 | (E1) | 183.40 176.72 142.5 130.30 | (5-) (5+) (5+) (4+) | |
283.48 13 | A | (3-) | 140.8 4 193.0 2 237.7 3 ? 246.2 2 260.1 1 | 20 5 11 4 26 5 36 8 100 11 | (M1) | 142.5 90.56 45.8 37.17 23.40 | (5+) (+) (-) (2-) (2-) | |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
300 2 | A | |||||||
317.2 5 | A | 280.0 5 283.0 5 ? | ≈100 ≈100 | 37.17 34.2 | (2-) | |||
333.04 12 | A | (3+) | 202.7 1 222.7 2 232.6 2 ? 242.6 2 252.6 2 267.8 5 ? 280.8 4 283.4 4 285.8 5 ? 288.9 5 ? 295.5 4 303.2 2 | 88 13 ≈16 59 9 47 8 63 13 33 11 ≈31 ≈47 ≈16 ≈47 ≈31 100 18 | M1(+E2) (M1) (M1) | 130.30 110.53 100.44 90.56 80.49 65.2 52.20 49.08 47.4 44.2 37.17 29.83 | (4+) (+) (+) (3+) (2+) (3-) (2-) (1+) | |
353.89 11 | A | (3-) | 237.5 2 244.7 5 248.8 5 ? 269.1 4 ? 278.0 5 ? 290.0 5 309.6 3 ? 316.8 1 330.4 1 | 18.9 23 9.6 23 7.7 27 13 3 ≈9 ≈23 ≈23 100 14 <50 | (M1) (M1) (M1) (M1) | 116.46 109.33 105.1 84.1 75.9 64.47 44.2 37.17 23.40 | (4-) (4-) (3+) (2-) (2-) | |
360.25 11 | A | (3+) | 230.0 1 268.7 5 ? 279.5 4 308.0 1 312.8 4 ? 330.4 1 | 45 8 9 2 9.3 23 100 10 ≈5.0 <28 | M1(+E2) M1(+E2) | 130.30 90.56 80.49 52.20 47.4 29.83 | (4+) (+) (3+) (2+) (1+) | |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
380.80 16 | A | (+) | 250.5 2 300.3 3 328.6 2 351.0 4 | 59 12 ≈17 100 14 ≈17 | (M1) | 130.30 80.49 52.20 29.83 | (4+) (3+) (2+) (1+) | |
395.84 19 | A | (4-) | 212.5 5 253.4 5 317.2 2 347.0 3 | ≈42 ≈67 ≈580 100 42 | 183.40 142.5 78.51 49.08 | (5-) (5+) (3-) (3-) | ||
402.92 16 | A | (4+) | 226.3 2 299.5 3 312.3 3 322.4 2 | ≈17 ≈33 ≈17 100 13 | M1(+E2) | 176.72 103.31 90.56 80.49 | (5+) (4+) (+) (3+) | |
448.08 20 | A | (5-) | 195.5 2 317.8 3 344.3 4 | 100 30 ≈300 ≈100 | 252.68 130.30 103.31 | (6+) (4+) (4+) | ||
452.1 4 | A | (5+) | 335.6 3 | 100 | 116.46 | (4-) |
Jπ(level): Assignments are mainly from 2004Sh25 based on interpretation of parity-doublets (reflection asymmetric) structures in 224Ac. Some of the assignments are supported by transition multipolarities from conversion electron data for high energy transitions and E1 assignments from I(K-x ray)/Iγ ratios. For the Kπ=0 and 1 bands, two scenarios are presented in their figures 4 and 5 of 2004Sh25. See detailed discussion by the authors. Assignments given here are arbitrarily taken from figure 4 in 2004Sh25. Kπ=3+ and 3- parity- doublet bands are also supported by 1994Ah03 with minor differences in level assignments at high energy.
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Band based on (0-). | |||||||
0 | (0-) | 2.78 h 16 % ε = 90.9 +14-20 % α = 9.1 +20-14 | |||||
17.60 15 | (1-) | ||||||
37.17 9 | (2-) | ||||||
78.51 12 | (3-) | 26.3 1 | 100 14 | E1 | 52.20 | (2+) | |
116.46 13 | (4-) | ||||||
183.40 13 | (5-) | 53.1 1 74.1 3 80.1 1 | 100 15 38 10 85 15 | (E1) (E1) | 130.30 109.33 103.31 | (4+) (4-) (4+) | |
236.5 4 | (6-) | ||||||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - Band based on 1+. | |||||||
29.83 9 | (1+) | ||||||
52.20 11 | (2+) | ||||||
80.49 10 | (3+) | ||||||
130.30 11 | (4+) | 49.8 1 51.8 1 78.6 3 ? 81.2 1 | 20 4 100 11 8 4 89 15 | (E1) | 80.49 78.51 52.20 49.08 | (3+) (3-) (2+) (3-) | |
176.72 14 | (5+) | ||||||
252.68 17 | (6+) | 69.3 2 76.0 2 110.3 4 122.5 5 | 100 17 43 12 86 17 ≈23 | (E1) | 183.40 176.72 142.5 130.30 | (5-) (5+) (5+) (4+) | |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - Band based on (3-). | |||||||
353.89 11 | (3-) | ||||||
395.84 19 | (4-) | ||||||
448.08 20 | (5-) | ||||||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 4 - Band based on (3+). | |||||||
360.25 11 | (3+) | ||||||
402.92 16 | (4+) | ||||||
452.1 4 | (5+) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
29.83 | (1+) | 29.8 1 | E1 | 2.83 | α=2.83 5 | ||
37.17 | (2-) | 37.2 1 | [E2] | 1200 | α=1200 24 | ||
52.20 | (2+) | 28.8 1 | E1 | 3.10 | α=3.10 6 | ||
(2+) | 34.6 1 | E1 | 1.91 | α=1.91 | |||
78.51 | (3-) | 26.3 1 | E1 | 3.93 | α=3.93 7 | ||
80.49 | (3+) | 43.3 1 | E1 | 1.054 | α=1.054 17 | ||
90.56 | (+) | 67.2 1 | (E1) | 0.327 | α=0.327 | ||
103.31 | (4+) | 54.2 1 | (E1) | 0.580 | α=0.580 | ||
116.46 | (4-) | 36.0 1 | (E1) | 1.72 | α=1.72 3 | ||
130.30 | (4+) | 51.8 1 | (E1) | 0.654 | α=0.654 | ||
176.72 | (5+) | 60.3 2 | (E1) | 0.436 | α=0.436 8 | ||
183.40 | (5-) | 53.1 1 | (E1) | 0.612 | α=0.612 | ||
(5-) | 80.1 1 | (E1) | 0.205 | α=0.205 | |||
252.68 | (6+) | 69.3 2 | (E1) | 0.301 | α=0.301 | ||
283.48 | (3-) | 237.7 3 | (M1) | 1.473 | α=1.473 | ||
333.04 | (3+) | 202.7 1 | M1(+E2) | 0.6 LT | 2.07 | α=2.07 23 | |
(3+) | 242.6 2 | (M1) | 1.392 | α=1.392 | |||
(3+) | 252.6 2 | (M1) | 1.244 | α=1.244 | |||
353.89 | (3-) | 237.5 2 | (M1) | 1.476 | α=1.476 | ||
(3-) | 244.7 5 | (M1) | 1.359 | α=1.359 | |||
(3-) | 316.8 1 | (M1) | 0.666 | α=0.666 | |||
(3-) | 330.4 1 | (M1) | 0.593 | α=0.593 | |||
360.25 | (3+) | 230.0 1 | M1(+E2) | 0.7 LT | 1.41 | α=1.41 21 | |
(3+) | 308.0 1 | M1(+E2) | 0.4 LT | 0.68 | α=0.68 4 | ||
380.80 | (+) | 250.5 2 | (M1) | 1.273 | α=1.273 | ||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
402.92 | (4+) | 322.4 2 | M1(+E2) | 0.7 LT | 0.55 | α=0.55 9 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0 | (0-) | 2.78 h 16 % ε = 90.9 +14-20 % α = 9.1 +20-14 | E(level): Band based on (0-). |
17.60 | (1-) | E(level): Band based on (0-). | |
29.83 | (1+) | E(level): Band based on 1+. | |
37.17 | (2-) | E(level): Band based on (0-). | |
52.20 | (2+) | E(level): Band based on 1+. | |
78.51 | (3-) | α 48.6γ is omitted here due to unlikely M2 multipolarity implied from assigned Jπ values. E(level): Band based on (0-). | |
80.49 | (3+) | E(level): Band based on 1+. | |
116.46 | (4-) | E(level): Band based on (0-). | |
130.30 | (4+) | E(level): Band based on 1+. | |
176.72 | (5+) | E(level): Band based on 1+. | |
183.40 | (5-) | E(level): Band based on (0-). | |
236.5 | (6-) | E(level): Band based on (0-). | |
252.68 | (6+) | E(level): Band based on 1+. | |
353.89 | (3-) | E(level): Band based on (3-). | |
360.25 | (3+) | E(level): Band based on (3+). | |
395.84 | (4-) | E(level): Band based on (3-). | |
402.92 | (4+) | E(level): Band based on (3+). | |
448.08 | (5-) | E(level): Band based on (3-). | |
452.1 | (5+) | E(level): Band based on (3+). |
E(level) | E(gamma) | Comments |
64.47 | 41.1 | M(γ): (M1) listed in 1993Sh07, but no argument given |
109.33 | 60.3 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
176.72 | 60.3 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
353.89 | 330.4 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
360.25 | 330.4 | E(γ): Multiply placed with undivided intensity I(γ): Multiply placed with undivided intensity |
224Ac identified and produced by 1948Gh01 in Th(d,X) at 80 MeV, with an estimated half-life of ≈2.5 h. Later studies of 224Ac decay: 1951Me10, 1958Hi78, 1968Le17, 1976MiZR, 1987Mi10, 1992Li31.
Theoretical calculations: 24 references extracted from the NSR database are listed in document records.
All data are from 228Pa α decay
In this evaluation, the level scheme is essentially that proposed by 1994Ah03 with some modifications suggested in 2004Sh25. The band structures are taken essentially from 2004Sh25, but considered tentative at this stage. As pointed out in 1994Ah03 and 2004Sh25, the level scheme of 224Ac is very complex and many additional levels are expected. Thus the level scheme presented here is considered as incomplete. Information about confirmed multipolarities, mixing ratios and other spectroscopic details is lacking. Further experiments on the decay of 228Pa, and involving nuclear reactions are needed to confirm and elucidate the structure of this nucleus.
2004Sh25 suggest five other bands, not listed here, for which only one or two levels each are known.
Q-value: S(2n)=12530 6, S(2p)=10722 8 (2021Wa16)