ADOPTED LEVELS, GAMMAS for 91Y
Author: Coral M. Baglin | Citation: Nucl. Data Sheets 114, 1293 (2013) | Cutoff date: 1-Sep-2013
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=1544.3 keV 18 | S(n)= 7928.3 keV 25 | S(p)= 7692 keV 3 | Q(α)= -4179 keV 3 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 91Y IT decay (49.71 M) | B | 91Sr β- decay |
| C | 89Y(t,p) | D | 92Zr(d,3He),(t,α) |
| E | 94Zr(p,α) | F | 12C(82Se,p2nγ) |
| G | 173Yb(24Mg,xγ),176Yb(23Na,xγ) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | ABCDE G | 1/2- | 58.51 d 6 % β- = 100 | |||||
| 555.58 5 | AB DEFG | 9/2+ | 49.71 m 4 % IT ≈ 100 % β- < 1.5 | 555.57 5 | 100 | M4 | 0 | 1/2- |
| 653.02 7 | BCDE | 3/2- | 652.9 2 | 100 | 0 | 1/2- | ||
| 925.74 7 | BCDE | 5/2- | 272.6 6 925.8 2 | 6.8 10 100.0 9 | [M1,E2] (E2) | 653.02 0 | 3/2- 1/2- | |
| 1186.88 6 | BC E | (7/2)- | 261.2 2 533.9 1 631.3 1 | 80.7 12 13.9 6 100.0 18 | 925.74 653.02 555.58 | 5/2- 3/2- 9/2+ | ||
| 1305.39 6 | B E | (5/2)+ | 118.5 2 379.9 1 652.3 3 749.8 1 1305.3 1 | 0.311 14 0.622 14 12.6 7 100.0 7 0.071 14 | [E1] (E2) | 1186.88 925.74 653.02 555.58 0 | (7/2)- 5/2- 3/2- 9/2+ 1/2- | |
| 1473.69 7 | BCDE | 3/2- | 820.8 2 1473.8 1 | 96.0 20 100.0 20 | 653.02 0 | 3/2- 1/2- | ||
| 1485.09 21 | FG | (13/2+) | 929.5 2 | 100 | Q | 555.58 | 9/2+ | |
| 1545.90 6 | B DE | (5/2)- | 359.1 1 620.1 1 892.9 1 1545.9 1 | 2.83 19 100.0 19 3.96 19 3.77 19 | M1(+E2) | 1186.88 925.74 653.02 0 | (7/2)- 5/2- 3/2- 1/2- | |
| 1547 10 | C | 7/2-,9/2- | ||||||
| 1579.93 7 | B E | 5/2+,7/2+ | 274.7 2 393.0 1 653 2 1024.3 1 | 3.09 8 0.15 1 1.1 4 100 | (M1) M1,E2 | 1305.39 1186.88 925.74 555.58 | (5/2)+ (7/2)- 5/2- 9/2+ | |
| 1980.41 7 | BCDE | (5/2)- | 506.7 1 793.6 1 1054.6 1 1327.4 1 | 19.4 15 28.4 15 100.0 15 17.9 15 | 1473.69 1186.88 925.74 653.02 | 3/2- (7/2)- 5/2- 3/2- | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2066.62 7 | BCD | (5/2)+ | 486.5 2 520.8 3 593.1 1 761.4 1 879.7 1 1140.8 1 1413.4 1 | 8.2 3 3.4 3 9.6 3 58.7 10 19.1 3 13.0 3 100.0 14 | 1579.93 1545.90 1473.69 1305.39 1186.88 925.74 653.02 | 5/2+,7/2+ (5/2)- 3/2- (5/2)+ (7/2)- 5/2- 3/2- | ||
| 2129.09 12 | B D | 3/2,5/2,7/2 | 823.7 1 | 100 | 1305.39 | (5/2)+ | ||
| 2157.1 3 | FG | (17/2+) | 672.0 2 | 100 | Q | 1485.09 | (13/2+) | |
| 2158 15 | CD | 3/2-,5/2- | ||||||
| 2206.76 9 | BCDE | 5/2- | 626.8 1 660.9 1 901.3 2 1280.9 5 1553.6 3 1651.4 5 | 4.7 4 10.8 4 10.0 4 100.0 11 1.8 4 31.2 4 | 1579.93 1545.90 1305.39 925.74 653.02 555.58 | 5/2+,7/2+ (5/2)- (5/2)+ 5/2- 3/2- 9/2+ | ||
| 2279.34 10 | B | (5/2+,7/2-) | 973.9 1 1353.5 2 1626.8 3 1724.0 5 | 25.0 21 14.6 21 8.3 21 100.0 21 | 1305.39 925.74 653.02 555.58 | (5/2)+ 5/2- 3/2- 9/2+ | ||
| 2412.15 12 | B E | (3/2-) | 1486.4 1 2412.3 2 ? | 100 25 33 8 | 925.74 0 | 5/2- 1/2- | ||
| 2471 13 | CD | 3/2- | ||||||
| 2530 | E | (5/2-) | ||||||
| 2568 11 | CD | 1/2- | ||||||
| 2572.13 12 ? | B | (5/2+,7/2,9/2-) | 992.2 1 ? 1646 1 ? 2016 1 ? | 100 8 6.9 8 9.2 23 | 1579.93 925.74 555.58 | 5/2+,7/2+ 5/2- 9/2+ | ||
| 2631 | C | |||||||
| 2689 | C | (7/2-,9/2-) | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 2761.9 6 | G | (15/2,17/2) | 1276.8 7 | 100 | 1485.09 | (13/2+) | ||
| 2780 | E | (9/2+) | ||||||
| 2822 15 | C | |||||||
| 2960 | C E | (3/2-) | ||||||
| 2980 | C | (1/2-) | ||||||
| 3045 | C | 1/2- | ||||||
| 3100 | E | (9/2-) | ||||||
| 3162.9 6 | G | (15/2,17/2) | 1677.7 7 | 100 | 1485.09 | (13/2+) | ||
| 3196 | C | (7/2-,9/2,11/2+) | ||||||
| 3227 | C | (9/2+,11/2+) | ||||||
| 3284 | C | 7/2-,9/2- | ||||||
| 3320 | C | 11/2-,13/2- | ||||||
| 3353 | C | 7/2-,9/2- | ||||||
| 3414 | C | 7/2-,9/2- | ||||||
| 3445 | C | 7/2-,9/2- | ||||||
| 3502 | C | 5/2+,7/2,9/2- | ||||||
| 3527.7 4 | FG | (21/2+) | 1370.6 3 | 100 | Q | 2157.1 | (17/2+) | |
| 3544 | C | 11/2-,13/2- | ||||||
| 3568.1 6 | G | (19/2,21/2) | 806.2 7 1410.8 7 | 100 14 98 12 | 2761.9 2157.1 | (15/2,17/2) (17/2+) | ||
| 3611 | C | (3/2-,5/2-) | ||||||
| 3684 | C | (3/2-,5/2,7/2+) | ||||||
| 3733.2 4 | FG | (19/2,21/2) | 570.3 7 1576.3 4 | 88 11 100 14 | 3162.9 2157.1 | (15/2,17/2) (17/2+) | ||
| 3751 | C | 5/2+,7/2,9/2- | ||||||
| 3793 | C | 9/2+,11/2+ | ||||||
| 3839 | C | 9/2+,11/2+ | ||||||
| 3870 | C | 3/2-,5/2- | ||||||
| 3938 | C | (9/2+,11/2+) | ||||||
| 3966 | C | (3/2-,5/2-) | ||||||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 4064.5 8 | G | 1907.3 9 | 100 | 2157.1 | (17/2+) | |||
| 4096 | C | (3/2-,5/2-) | ||||||
| 4147.0 4 | FG | (23/2,25/2+) | 413.8 2 578.6 7 619.2 3 | 44 4 30 4 100 7 | 3733.2 3568.1 3527.7 | (19/2,21/2) (19/2,21/2) (21/2+) | ||
| 4190.5 8 | G | 2033.3 9 | 100 | 2157.1 | (17/2+) | |||
| 4225 | C | (1/2-) | ||||||
| 4451 | C | (3/2-,5/2-) | ||||||
| 4481.2 5 | FG | (25/2+) | 334.2 4 953.5 9 | 100 10 10.9 20 | 4147.0 3527.7 | (23/2,25/2+) (21/2+) | ||
| 4611.4 8 | G | 420.8 9 546.8 9 | 40 12 100 16 | 4190.5 4064.5 | ||||
| 4808.5 6 | FG | 327.4 2 | 100 | 4481.2 | (25/2+) | |||
| 5574.8 7 | G | 766.4 7 963.2 9 1093.7 9 | 100 14 65 10 61 10 | 4808.5 4611.4 4481.2 | (25/2+) | |||
| 5778.1 10 | G | 1296.7 9 | 100 | 4481.2 | (25/2+) | |||
| 6503.1 9 | G | 928.5 7 | 100 | 5574.8 | ||||
| 6896.1 11 | G | 393.2 9 1117.8 9 | 100 16 53 13 | 6503.1 5778.1 | ||||
E(level): Level energies with ΔE<5 keV are from least-squares fit to adopted Eγ; the others are from (t,p), (t,α) and/or (p,α). If no uncertainty is given, this is because the authors did not state one.
Jπ(level): Target spins are 1/2- for (t,p) and 0+ for (p,α). Jπ assignments from (p,α) are based on DWBA three-nucleon transfer calculations.
I(γ): γ branching ratios for each level; from β- decay, except as noted.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - ΔJ=2 SEQUENCE BASED ON 9/2+ ISOMER. | |||||||
| 555.58 5 | 9/2+ | 49.71 m 4 % IT ≈ 100 % β- < 1.5 | |||||
| 1485.09 21 | (13/2+) | 929.5 2 | 100 | Q | 555.58 | 9/2+ | |
| 2157.1 3 | (17/2+) | 672.0 2 | 100 | Q | 1485.09 | (13/2+) | |
| 3527.7 4 | (21/2+) | 1370.6 3 | 100 | Q | 2157.1 | (17/2+) | |
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 555.58 | 9/2+ | 49.71 m 4 % IT ≈ 100 % β- < 1.5 | 555.57 5 | M4 | 0.0531 | B(M4)(W.u.)=1.6 8, α=0.0531 | |
| 925.74 | 5/2- | 272.6 6 | [M1,E2] | 0.021 | α=0.021 8 | ||
| 1305.39 | (5/2)+ | 118.5 2 | [E1] | 0.0653 | α=0.0653 | ||
| 1545.90 | (5/2)- | 620.1 1 | M1(+E2) | 2.1 LE | |||
| 1579.93 | 5/2+,7/2+ | 274.7 2 | (M1) | 0.01245 | α=0.01245 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 555.58 | 9/2+ | 49.71 m 4 % IT ≈ 100 % β- < 1.5 | μ=5.96 4 (1991Be18) E(level): ΔJ=2 SEQUENCE BASED ON 9/2+ ISOMER. Jπ(level): ΔJ=2 sequence based on 9/2+ isomer. |
| 1485.09 | (13/2+) | E(level): ΔJ=2 SEQUENCE BASED ON 9/2+ ISOMER. Jπ(level): ΔJ=2 sequence based on 9/2+ isomer. | |
| 1545.90 | (5/2)- | XREF: d(1552). | |
| 1547 | 7/2-,9/2- | Probably differs from 1552 level seen in (t,α). Otherwise, L(t,α)=3 and L(t,p)=4 on 1/2- target would determine Jπ=7/2-; such a state would exhaust 50% of the f7/2 proton hole strength, in contradiction to shell-model systematics (1975Pr04). E(level): Probably differs from 1552 level seen in (t,α). Otherwise, L(t,α)=3 and L(t,p)=4 on 1/2- target would determine Jπ=7/2-; such a state would exhaust 50% of the f7/2 proton hole strength, in contradiction to shell-model systematics (1975Pr04). | |
| 1980.41 | (5/2)- | XREF: d(1974). | |
| 2157.1 | (17/2+) | E(level): ΔJ=2 SEQUENCE BASED ON 9/2+ ISOMER. Jπ(level): ΔJ=2 sequence based on 9/2+ isomer. | |
| 2631 | Possibly an unresolved doublet. E(level): Possibly an unresolved doublet. | ||
| 2960 | (3/2-) | XREF: E(2970). | |
| 3196 | (7/2-,9/2,11/2+) | Possibly an unresolved doublet. E(level): Possibly an unresolved doublet. | |
| 3527.7 | (21/2+) | E(level): ΔJ=2 SEQUENCE BASED ON 9/2+ ISOMER. Jπ(level): ΔJ=2 sequence based on 9/2+ isomer. | |
| 4225 | (1/2-) | Possibly an unresolved doublet. E(level): Possibly an unresolved doublet. |
| E(level) | E(gamma) | Comments |
| 925.74 | 925.8 | M(γ): M1,E2 from α(K)exp in β- decay; ΔJ=2 from level scheme. |
| 1305.39 | 749.8 | M(γ): M1,E2 from α(K)exp in β- decay; not M1 from level scheme. |
| 1485.09 | 929.5 | E(γ): From 12C(82Se,p2nγ). I(γ): From 12C(82Se,p2nγ). M(γ): From 12C(82Se,p2nγ). |
| 2157.1 | 672.0 | E(γ): From 12C(82Se,p2nγ). I(γ): From 12C(82Se,p2nγ). M(γ): From 12C(82Se,p2nγ). |
| 2761.9 | 1276.8 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 3162.9 | 1677.7 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 3527.7 | 1370.6 | E(γ): From 12C(82Se,p2nγ). I(γ): From 12C(82Se,p2nγ). M(γ): From 12C(82Se,p2nγ). |
| 3568.1 | 806.2 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 1410.8 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 3733.2 | 570.3 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 1576.3 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 4064.5 | 1907.3 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 4147.0 | 413.8 | E(γ): from 12C(82Se,p2nγ). I(γ): from 173Yb(24Mg,Xγ); <54 from (82Se,p2nγ). | 578.6 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 619.2 | M(γ): ADO and DCO in (82Se,p2nγ) favor ΔJ=0,2. |
| 4190.5 | 2033.3 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 4481.2 | 334.2 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). M(γ): ADO and DCO in (82Se,p2nγ) favor ΔJ=0,2. | 953.5 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 4611.4 | 420.8 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 546.8 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 4808.5 | 327.4 | E(γ): From 12C(82Se,p2nγ). I(γ): From 12C(82Se,p2nγ). M(γ): possibly ΔJ=0,2 γ from 12C(82Se,p2nγ). |
| 5574.8 | 766.4 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 963.2 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 1093.7 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 5778.1 | 1296.7 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| E(level) | E(gamma) | Comments |
| 6503.1 | 928.5 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
| 6896.1 | 393.2 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). | 1117.8 | E(γ): From 173Yb(24Mg,Xγ). I(γ): From 173Yb(24Mg,Xγ). |
Hyperfine anomaly between 91gY and 91mY in Fe: see 2004Ni13 (NMR on oriented nuclei with β and γ detection); -4.2% 8 anomaly.
Theory (partial list):
Level structure: 1975Gl07, 1966Ve02, 1965Au04 (shell-model calculations).
Unique-forbidden β decay matrix elements: 1985Kh03, 1985To18, 1972Ej01.
Magnetic moment: 1988Sa42, 1986Le15 (quasi-particle phonon model).
Other reaction:
92Zr(γ,p) (2007Tr10); 18, 21.5, 23.5 MeV bremsstrahlung end-point energies; measured γ spectra; observed known 555γ from 91Y and and 1205γ from 91Zr; deduced isomeric ratio for 91m,gY.