ADOPTED LEVELS, GAMMAS for 223Ac
Author: E. Browne | Citation: Nucl. Data Sheets 93, 846 (2001) | Cutoff date: 1-May-2001
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-1559 keV 12 | S(n)= 6866 keV 9 | S(p)= 3784 keV 9 | Q(α)= 6783.2 keV 10 | ||
Reference: 2012WA38 |
References: | |||
A | 227Pa α decay |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | A | (5/2-) | 2.10 m 5 % α = 99 % ε = 1 | |||||
12.5 2 ? | A | (3/2-) | ||||||
42.4 1 | A | (7/2-) | ≤ 0.25 ns | 42.4 1 | 100 | M1+E2 | 0.0 | (5/2-) |
50.7 1 | A | (5/2-) | ≤ 0.25 ns | 8.0S 50.7 1 | 6 100 | [M1] M1+E2 | 42.4 0.0 | (7/2-) (5/2-) |
64.62 4 | A | (5/2+) | ≤ 0.25 ns | 22.3 1 64.62 5 | 2.1 6 100 | E1 E1 | 42.4 0.0 | (7/2-) (5/2-) |
90.7 1 | A | (9/2-) | ≤ 0.25 ns | 48.3 1 | 100 | M1 | 42.4 | (7/2-) |
107.2 2 | A | (7/2-) | ≤ 0.25 ns | 56.6 2 107.0 5 | ≈80 ≈100 | M1 | 50.7 0.0 | (5/2-) (5/2-) |
110.06 4 | A | (7/2+) | ≤ 0.25 ns | 45.6 2 59.5 2 67.6 1 110.05 5 | ≈2.5 8.4 20 34 4 100 7 | (M1) E1 E1 E1 | 64.62 50.7 42.4 0.0 | (5/2+) (5/2-) (7/2-) (5/2-) |
130.7 1 | A | (7/2+) | 80.0 1 ? 130.7 1 ? | 56 9 100 23 | E1 E1 | 50.7 0.0 | (5/2-) (5/2-) | |
141 5 | A | (11/2-) | ||||||
167.5 1 | A | (9/2+) | ≤ 0.25 ns | 57.5 77.0 2 125.1 1 | 13 7 100 15 | (E1) E1 | 110.06 90.7 42.4 | (7/2+) (9/2-) (7/2-) |
E(level): From 227Pa α decay.
Jπ(level): Parity doublet rotational band assignments are from 1990Sh16, 1990Sh15, 1989Ah05, and 1990Ja11. Spin and parity assignments are based on rotational band structure and γ-ray multipolarities. Specific arguments are given with individual levels.
T1/2(level): From 227Pa α decay (1989Ah05).
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - 5/2(523) PARITY DOUBLET ROTATIONAL band. | |||||||
0.0 | (5/2-) | 2.10 m 5 % α = 99 % ε = 1 | |||||
42.4 1 | (7/2-) | ≤ 0.25 ns | |||||
90.7 1 | (9/2-) | ≤ 0.25 ns | 48.3 1 | 100 | M1 | 42.4 | (7/2-) |
141 5 | (11/2-) | ||||||
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - 5/2(642) PARITY DOUBLET ROTATIONAL band. | |||||||
64.62 4 | (5/2+) | ≤ 0.25 ns | |||||
110.06 4 | (7/2+) | ≤ 0.25 ns | |||||
167.5 1 | (9/2+) | ≤ 0.25 ns | 57.5 77.0 2 125.1 1 | 13 7 100 15 | (E1) E1 | 110.06 90.7 42.4 | (7/2+) (9/2-) (7/2-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 3 - 3/2(532) PARITY DOUBLET ROTATIONAL band. | |||||||
12.5 2 | (3/2-) | ||||||
50.7 1 | (5/2-) | ≤ 0.25 ns | |||||
107.2 2 | (7/2-) | ≤ 0.25 ns | 56.6 2 107.0 5 | ≈80 ≈100 | M1 | 50.7 0.0 | (5/2-) (5/2-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 4 - 3/2(651) PARITY DOUBLET ROTATIONAL band. | |||||||
130.7 1 | (7/2+) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
42.4 | (7/2-) | ≤ 0.25 ns | 42.4 1 | M1+E2 | 0.63 1 | 214 | α=214 |
50.7 | (5/2-) | ≤ 0.25 ns | 8.0 | [M1] | 1542 | α=1542 | |
(5/2-) | ≤ 0.25 ns | 50.7 1 | M1+E2 | 0.26 1 | 41.9 | α=41.9 11 | |
64.62 | (5/2+) | ≤ 0.25 ns | 22.3 1 | E1 | 6.17 | α=6.17 | |
(5/2+) | ≤ 0.25 ns | 64.62 5 | E1 | 0.369 | α=0.369 | ||
90.7 | (9/2-) | ≤ 0.25 ns | 48.3 1 | M1 | 30.3 | α=30.3 | |
107.2 | (7/2-) | ≤ 0.25 ns | 107.0 5 | M1 | 7.17 | α=7.17 | |
110.06 | (7/2+) | ≤ 0.25 ns | 45.6 2 | (M1) | 36.0 | α=36.0 | |
(7/2+) | ≤ 0.25 ns | 59.5 2 | E1 | 0.459 | α=0.459 | ||
(7/2+) | ≤ 0.25 ns | 67.6 1 | E1 | 0.327 | α=0.327 | ||
(7/2+) | ≤ 0.25 ns | 110.05 5 | E1 | 0.393 | α=0.393 | ||
130.7 | (7/2+) | 80.0 1 | E1 | 0.209 | α=0.209 | ||
(7/2+) | 130.7 1 | E1 | 0.259 | α=0.259 | |||
167.5 | (9/2+) | ≤ 0.25 ns | 77.0 2 | (E1) | 0.231 | α=0.231 | |
(9/2+) | ≤ 0.25 ns | 125.1 1 | E1 | 0.288 | α=0.288 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | (5/2-) | 2.10 m 5 % α = 99 % ε = 1 | %α: from 1951Me10. E(level): %α: from 1951Me10. 5/2(523) PARITY DOUBLET ROTATIONAL band. |
12.5 | (3/2-) | E(level): 3/2(532) PARITY DOUBLET ROTATIONAL band. | |
42.4 | (7/2-) | ≤ 0.25 ns | E(level): 5/2(523) PARITY DOUBLET ROTATIONAL band. |
50.7 | (5/2-) | ≤ 0.25 ns | E(level): 3/2(532) PARITY DOUBLET ROTATIONAL band. |
64.62 | (5/2+) | ≤ 0.25 ns | E(level): 5/2(642) PARITY DOUBLET ROTATIONAL band. |
90.7 | (9/2-) | ≤ 0.25 ns | E(level): 5/2(523) PARITY DOUBLET ROTATIONAL band. |
107.2 | (7/2-) | ≤ 0.25 ns | E(level): 3/2(532) PARITY DOUBLET ROTATIONAL band. |
110.06 | (7/2+) | ≤ 0.25 ns | E(level): 5/2(642) PARITY DOUBLET ROTATIONAL band. |
130.7 | (7/2+) | E(level): 3/2(651) PARITY DOUBLET ROTATIONAL band. | |
141 | (11/2-) | E(level): 5/2(523) PARITY DOUBLET ROTATIONAL band. | |
167.5 | (9/2+) | ≤ 0.25 ns | E(level): 5/2(642) PARITY DOUBLET ROTATIONAL band. |
Levels: The level structure presents the characteristic parity doublet bands and has been interpreted in terms of a nucleus with both quadrupole and octupole stable deformations (1988Le13,1989Ah05,1990Sh16,1990Sh15). α 5/2[523] configuration was assigned to the ground state of 223Ac, and a 3/2[532] configuration is expected to lie close to the ground state (1988Le13). Favored α decay from 227Pa (5/2-) populates the g.s. of 223Ac (HF=2.5) and the 50.7 (5/2-) level (HF=5.1) through the Coriolis mixing between these states. No direct α decay from 227Pa (5/2-) to levels with Jπ=3/2- has been observed because such levels are not be mixed with the favored (Jπ=5/2-) ground state (1988Le13). Level parities assigned by 1990Sh16 and 1990Sh15 are opposite to those given by 1989Ah05. These quantities are essentially determined by the parity of the 223Ac ground state, which has been adopted as odd in this evaluation.
Levels: Because of the small quadrupole, and the suggested octupole deformations in this region, nuclear states are no longer characterized by single Nilsson orbitals. These are, however, used here more as labels rather than to accurately describe the nature of those states.
Q-value: Note: Current evaluation has used the following Q record $ -1555 126863 93783 8 6783.1 9 1995Au04