ADOPTED LEVELS, GAMMAS for 218Th
Author: Balraj Singh | Citation: ENSDF | Cutoff date: 10-Jun-2021
Authors: Balraj Singh, M.S. Basunia, Murray Martin Et Al., | Citation: Nucl. Data Sheets 160, 405 (2019) | Cutoff date: 30-Oct-2019
Full ENSDF file | Adopted Levels (PDF version)
Q(β-)=-6283 keV 21 | S(n)= 7910 keV 15 | S(p)= 3625 keV 15 | Q(α)= 9849 keV 9 | ||
Reference: 2021WA16 |
References: | |||
A | 222U α decay (4.7 μs) | B | 174Yb(48Ca,4nγ) |
C | 206Pb(16O,4nγ),209Bi(14N,5nγ) |
E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
0.0 | ABC | 0+ | 122 ns 5 % α = 100 | |||||
689.0 3 | BC | 2+ | 689.0 3 | 100 | E2 | 0.0 | 0+ | |
1078.0 6 | BC | (3-) | 388.9 6 | 100 | (D) | 689.0 | 2+ | |
1192.3 5 | BC | 4+ | 114.2 7 503.3 3 | 2.3 2 100.0 17 | (D) E2 | 1078.0 689.0 | (3-) 2+ | |
1560.8 6 | BC | 6+ | 368.5 3 | 100 | E2 | 1192.3 | 4+ | |
1761.7 7 | BC | 8+ | 1.2 ns 2 | 200.9 4 | 100 | E2 | 1560.8 | 6+ |
2099.5 9 | BC | 10+ | 0.25 ns 15 | 337.8 5 | 100 | E2 | 1761.7 | 8+ |
2272.6 10 | BC | (11-) | 173.1 4 | 100 | (E1) | 2099.5 | 10+ | |
2686.3 10 | BC | (13-) | 413.7 4 | 100 | (Q) | 2272.6 | (11-) | |
3160.0 12 | B | (15-) | 473.7 5 | 100 | (Q) | 2686.3 | (13-) | |
3306.7 13 | B | (16+) | 146.7 5 | 100 | (E1) | 3160.0 | (15-) |
E(level): From Eγ data
Jπ(level): In addition to the arguments given, the assignments are supported from shell-model calculations in 2020Od01
E(γ): From 174Yb(48Ca,4nγ). Values in 206Pb(16O,4nγ), 209Bi(14N,5nγ), listed under comments, seem consistently higher by about a keV
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 1 - Yrast (g.s.) band | |||||||
0.0 | 0+ | 122 ns 5 % α = 100 | |||||
689.0 3 | 2+ | 689.0 3 | 100 | E2 | 0.0 | 0+ | |
1192.3 5 | 4+ | 114.2 7 503.3 3 | 2.3 2 100.0 17 | (D) E2 | 1078.0 689.0 | (3-) 2+ | |
1560.8 6 | 6+ | 368.5 3 | 100 | E2 | 1192.3 | 4+ | |
1761.7 7 | 8+ | 1.2 ns 2 | 200.9 4 | 100 | E2 | 1560.8 | 6+ |
2099.5 9 | 10+ | 0.25 ns 15 | 337.8 5 | 100 | E2 | 1761.7 | 8+ |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
Band 2 - Band based on (11-) | |||||||
2272.6 10 | (11-) | ||||||
2686.3 10 | (13-) | 413.7 4 | 100 | (Q) | 2272.6 | (11-) | |
3160.0 12 | (15-) | 473.7 5 | 100 | (Q) | 2686.3 | (13-) |
E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
689.0 | 2+ | 689.0 3 | E2 | 0.0209 | α=0.0209 | |
1192.3 | 4+ | 503.3 3 | E2 | 0.0420 | α=0.0420 | |
1560.8 | 6+ | 368.5 3 | E2 | 0.093 | α=0.093 | |
1761.7 | 8+ | 1.2 ns 2 | 200.9 4 | E2 | 0.648 | B(E2)(W.u.)=11 2, α=0.648 11 |
2099.5 | 10+ | 0.25 ns 15 | 337.8 5 | E2 | 0.1187 | B(E2)(W.u.)=6 +9-2, α=0.1187 |
2272.6 | (11-) | 173.1 4 | (E1) | 0.133 | α=0.133 2 | |
3306.7 | (16+) | 146.7 5 | (E1) | 0.197 | α=0.197 4 |
Additional Level Data and Comments:
E(level) | Jπ(level) | T1/2(level) | Comments |
0.0 | 0+ | 122 ns 5 % α = 100 | Configuration=π(h9/26f7/22)#νg9/22 with 14% probability (2020Od01). E(level): Yrast (g.s.) band. |
689.0 | 2+ | Configuration=π(h9/26f7/22)#νg9/22 with 25% probability (2020Od01). E(level): Yrast (g.s.) band. | |
1078.0 | (3-) | XREF: C(?). | |
1192.3 | 4+ | Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01). E(level): Yrast (g.s.) band. | |
1560.8 | 6+ | Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01). E(level): Yrast (g.s.) band. | |
1761.7 | 8+ | 1.2 ns 2 | Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01). E(level): Yrast (g.s.) band. |
2099.5 | 10+ | 0.25 ns 15 | Configuration=π(h9/26f7/22)#ν(i11/21g9/21 with 26% probability (2020Od01). E(level): Yrast (g.s.) band. |
2272.6 | (11-) | XREF: C(?). E(level): Band based on (11-). | |
2686.3 | (13-) | XREF: C(?). E(level): Band based on (11-). | |
3160.0 | (15-) | Configuration=π(h9/26i13/22)#ν(g9/21j15/21) with 37% probability (2020Od01). E(level): Band based on (11-). | |
3306.7 | (16+) | Configuration=π(h9/27f7/21)#νg9/22 with 42% probability (2020Od01). |
E(level) | E(gamma) | Comments |
689.0 | 689.0 | E(γ): 689.6 6 in (16O,4nγ) M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known |
1078.0 | 388.9 | E(γ): 390.5 10 in (16O,4nγ) M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively. |
1192.3 | 114.2 | E(γ): from (48Ca,4nγ) only M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively. | 503.3 | E(γ): 504.6 6 in (16O,4nγ) M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known |
1560.8 | 368.5 | E(γ): 369.7 6 in (16O,4nγ) M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known |
1761.7 | 200.9 | E(γ): 201.9 6 in (16O,4nγ) M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known |
2099.5 | 337.8 | E(γ): 338.2 6 in (16O,4nγ) M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known |
2272.6 | 173.1 | E(γ): 173.3 6 in (16O,4nγ) M(γ): From γ-ray angular distribution in 174Yb(48Ca,4nγ), and intensity balance arguments |
2686.3 | 413.7 | E(γ): 414.5 10 in (16O,4nγ) M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively. |
3160.0 | 473.7 | E(γ): from (48Ca,nγ) only M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively. |
3306.7 | 146.7 | E(γ): from (48Ca,nγ). An unplaced 146.9 6 γ was seen in (16O,4nγ) M(γ): From γ-ray angular distribution in 174Yb(48Ca,4nγ), and intensity balance arguments |
218Th identified by 1973Hi06 in 209Bi(14N,5n) reaction and by 1973Ha32 in 206Pb(16O,4n), the two independent studies, 1973Hi06 published July 23, 1973, and 1973Ha32 on July 30, 1973.
Search for long-lived isomers: 2008La14 (no evidence found), 2007Ma57 (claimed evidence of presence of isomers)
Theory references: consult NSR database (www.nndc.bnl.gov/nsr/) for 64 primary references for calculations of half-lives of radioactive decays, and 23 for nuclear structure.
Q-value: Q(ε)=1520 60, S(2n)=14074 15, S(2p)=5503 13 (2021Wa16)