ADOPTED LEVELS, GAMMAS for 100Y
Authors: Balraj Singh and Jun Chen | Citation: Nucl. Data Sheets 172, 1 (2021) | Cutoff date: 31-Jan-2021
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=9050 keV 14 | S(n)= 4749 keV 13 | S(p)= 12095 keV 12 | Q(α)= -8398 keV 12 | ||
| Reference: 2017WA10 |
| References: | |||
| A | 100Sr β- decay (200 MS) | B | 101Sr β-n decay (118 MS) |
| C | 252Cf SF decay | D | 7Li(98Rb,T2NG) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | ABCD | (1)- | 732 ms 5 % β- = 100 % β-n = 1.02 6 | |||||
| 10.70 2 | A CD | 1+ | 10.68 3 | 100 | E1 | 0.0 | (1)- | |
| 76.15 3 | A CD | (2)+ | 72 ps 7 | 65.46 3 | 100 | M1(+E2) | 10.70 | 1+ |
| 99.16 2 | A | (0,1,2) | 88.50 3 99.20 3 | 100 5 90 4 | 10.70 0.0 | 1+ (1)- | ||
| 145 15 | 4+ | 0.94 s 3 % β- = 100 % β-n = 1.02 6 | ||||||
| 172.03 4 | A CD | (3+) | 95.94 4 | 100 | 76.15 | (2)+ | ||
| 194.98 2 | A | (0,1,2-) | 95.91 4 195.01 3 | 23.1 16 100 5 | 99.16 0.0 | (0,1,2) (1)- | ||
| 303.1 5 | C | (4+) | 131.1 | | 172.03 | (3+) | ||
| 309.83 3 | A | (0+,1,2) | 114.86 5 233.77 4 299.03 5 309.68 6 | 15.7 11 32.9 18 100 7 67 4 | 194.98 76.15 10.70 0.0 | (0,1,2-) (2)+ 1+ (1)- | ||
| 355.75 4 | A | 256.63 4 | 100 | 99.16 | (0,1,2) | |||
| 376.07 3 | A | (1+,2,3+) | 66.0 6 181.17 3 204.11 8 276.90 6 299.70 6 365.31 4 | 34 5 76 4 8.1 13 29 3 34.2 22 100 5 | 309.83 194.98 172.03 99.16 76.15 10.70 | (0+,1,2) (0,1,2-) (3+) (0,1,2) (2)+ 1+ | ||
| 461.1 7 | C | (5+) | 158.0 | | 303.1 | (4+) | ||
| 483.58 5 | A | (1+:4+) | 107.43 11 127.65 11 288.7 3 311.62 19 384.55 14 407.43 8 | 92 13 25 4 7.7 19 54 12 81 14 100 12 | 376.07 355.75 194.98 172.03 99.16 76.15 | (1+,2,3+) (0,1,2-) (3+) (0,1,2) (2)+ | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 656.6 9 | C | (6+) | 195.5 | | 461.1 | (5+) | ||
| 698.71 8 | A | (1+:4+) | 526.72 8 622.47 11 | 46 8 100 12 | 172.03 76.15 | (3+) (2)+ | ||
| 734.03 6 | A | (1+,2,3+) | 562.08 18 657.84 9 723.33 6 | 3.8 9 30 3 100 9 | 172.03 76.15 10.70 | (3+) (2)+ 1+ | ||
| 776.24 5 | A | 466.46 6 581.26 6 | 100 7 63 4 | 309.83 194.98 | (0+,1,2) (0,1,2-) | |||
| 827.97 8 | A | (1+,2,3+) | 633.04 10 655.87 11 | 89 9 100 16 | 194.98 172.03 | (0,1,2-) (3+) | ||
| 849.45 8 | A | 473.33 15 539.64 8 | 100 15 89 11 | 376.07 309.83 | (1+,2,3+) (0+,1,2) | |||
| 860.60 4 | A | 376.96 7 484.77 8 505.09 8 550.45 19 665.45 8 | 100 7 89 8 66 6 21 4 58 6 | 483.58 376.07 355.75 309.83 194.98 | (1+:4+) (1+,2,3+) (0+,1,2) (0,1,2-) | |||
| 861.19 6 | A | 762.06 6 861.02 11 | 100 10 62 7 | 99.16 0.0 | (0,1,2) (1)- | |||
| 874.0 10 | C | (7+) | 217.4 | | 656.6 | (6+) | ||
| 974.60 4 | A | 1+ | 875.45 11 898.50 4 963.85 4 | 1.56 17 86 4 100 4 | 99.16 76.15 10.70 | (0,1,2) (2)+ 1+ | ||
| 1045.70 13 | A | 873.90 14 969.02 21 | 100 20 59 14 | 172.03 76.15 | (3+) (2)+ | |||
| 1146.33 9 | A | 285.11 8 951.46 16 | 100 15 97 15 | 861.19 194.98 | (0,1,2-) | |||
| 1149.46 9 | A | 1073.31 8 | 100 | 76.15 | (2)+ | |||
| 1340.74 6 | A | 564.56 7 964.57 8 1241.66 19 | 30.0 22 100 9 27 5 | 776.24 376.07 99.16 | (1+,2,3+) (0,1,2) | |||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 1379.16 4 | A | (0+,1,2-) | 518.67 6 602.95 9 1003.04 11 1069.24 6 1183.90 17 1280.08 17 1302.89 16 1379.25 15 | 100 6 65 6 37 7 97 7 12 3 23 6 18 2 61 7 | 860.60 776.24 376.07 309.83 194.98 99.16 76.15 0.0 | (1+,2,3+) (0+,1,2) (0,1,2-) (0,1,2) (2)+ (1)- | ||
| 1389.85 11 | A | 240.64 8 ? 1313.70 10 | 62 6 100 7 | 1149.46 76.15 | (2)+ | |||
| 1412.14 14 | A | (1+,2,3+) | 1240.12 14 1401.2 4 | 100 10 50 13 | 172.03 10.70 | (3+) 1+ | ||
| 1699.99 10 | A | 1623.78 10 1689.61 25 | 100 6 27 8 | 76.15 10.70 | (2)+ 1+ | |||
E(level): From a least-squares fit to γ-ray energies
Jπ(level): Since levels are populated by the decay of 100Sr β- (Jπ(g.s.)=0+), J values are expected to be <4. In four cases where levels are populated by strong β- branches and associated log ft values in the range 4.4-5.7, Jπ is restricted to 1+ for the two very strong (≈40%) branches and to (1+) for two medium intensity (≈3%) branches. Log| ft values for levels with β- feedings of ≈1% or less have not been used in Jπ assignments since possible unobserved transitions can affect these feedings significantly
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) | I(γ) | M(γ) | Final Levels | |
| Band 1 - Kπ=1+, π5/2[422]~#ν3/2[411]. | |||||||
| 10.70 2 | 1+ | ||||||
| 76.15 3 | (2)+ | 72 ps 7 | 65.46 3 | 100 | M1(+E2) | 10.70 | 1+ |
| 172.03 4 | (3+) | 95.94 4 | 100 | 76.15 | (2)+ | ||
| 303.1 5 | (4+) | 131.1 | | 172.03 | (3+) | ||
| 461.1 7 | (5+) | ||||||
| 656.6 9 | (6+) | 195.5 | | 461.1 | (5+) | ||
| 874.0 10 | (7+) | 217.4 | | 656.6 | (6+) | ||
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Mixing Ratio | Conversion Coefficient | Additional Data |
| 10.70 | 1+ | 10.68 3 | E1 | 8.55 | α=8.55 14, α(L)=7.21 12, α(M)=1.197 20, α(N)=0.1389 23, α(O)=0.00506 8 | ||
| 76.15 | (2)+ | 72 ps 7 | 65.46 3 | M1(+E2) | 0.1 LT | 0.62 | B(M1)(W.u.)=0.67 +9-7, α=0.62 2 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (1)- | 732 ms 5 % β- = 100 % β-n = 1.02 6 | %β-n: weighted average of 1.8 6 (1996Me09), 1.08 5 (1993Ru01), 0.9 3 (1987PfZX), 0.85 9 (1986ReZU, supersedes 0.81 4 in 1986Wa17), and 0.9 2 (1986Wo01). Note that this value corresponds to one or both the activities: 732-ms g.s. and/or 0.94S. Other: |<10 (2009Pe06). |
| 10.70 | 1+ | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 76.15 | (2)+ | 72 ps 7 | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. |
| 99.16 | (0,1,2) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 145 | 4+ | 0.94 s 3 % β- = 100 % β-n = 1.02 6 | μ=+2.75 1 (2007Ch07,2010Ba31,2019StZV), Q=+1.85 20 (2007Ch07,2010Ba31,2016St14) %β-n: for one or both the 732-ms and 0.94S activities. See detailed comment about %β-n value for the g.s. E(level): %β-n: for one or both the 732-ms and 0.94S activities. See detailed comment about %β-n value for the g.s. |
| 172.03 | (3+) | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 303.1 | (4+) | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 309.83 | (0+,1,2) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 376.07 | (1+,2,3+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 461.1 | (5+) | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 483.58 | (1+:4+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 656.6 | (6+) | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 698.71 | (1+:4+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 734.03 | (1+,2,3+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 827.97 | (1+,2,3+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. | |
| 874.0 | (7+) | E(level): Kπ=1+, π5/2[422]~#ν3/2[411]. | |
| 974.60 | 1+ | Configuration=π5/2[422]~#ν3/2[422] (1987Wo07). | |
| 1412.14 | (1+,2,3+) | Jπ(level): Assignments of 2+, 3 or 4 will not be possible if definite β feeding from 0+ parent is determined in future experiments. |
| E(level) | E(gamma) | Comments |
| 10.70 | 10.68 | M(γ): from 100Sr β- decay, based on intensity balance and expected β feeding |
| 303.1 | 131.1 | E(γ): From 252Cf SF decay |
| 461.1 | 158.0 | E(γ): From 252Cf SF decay |
| 656.6 | 195.5 | E(γ): From 252Cf SF decay |
| 874.0 | 217.4 | E(γ): From 252Cf SF decay |
Other measurements:
1976SeZN associated a 10.5 μs isomer with 100Y, based on the observation of the following γ rays (each decaying with T1/2≈10 μs) in the α=100 mass-separated fission fragments: 172.7 (Iγ=86, T1/2=10.5 μs 20), 184.9 (Iγ=100, T1/2=10.5 μs 20), 357.5 (Iγ=74, T1/2=10.5 μs 20), 391.6 (Iγ=56, T1/2=15 μs 3), 658.2 (Iγ=30). No level scheme was suggested. The existence of this isomer should be considered as tentative since no confirmatory evidence is as yet available
2006Ca38: Measured resonance fluorescence spectra using collinear laser spectroscopy.
2007Ch07: Measured static moments using laser-spectroscopic method. In this experiment only one state (arbitrarily assumed by 2007Ch07 as the ground state) is observed. No information about the absolute energy and half-life is available from this experiment. The spin analysis by 2007Ch07 favors J=3; J|>4 cannot reproduce the observed hyperfine structure pattern, J=1 suggests unrealistic β2>0.7 and J=2 suggest β2=0.47 which is too large to be consistent with a rigid, strongly deformed nucleus. According to e-mail reply from the first author (B. Cheal) of 2007Ch07 on February 1, 2007, there seems uncertainty as to which of the two activities is observed in their experiment, but they claim to have observed only one state which they assume as the g.s. Further work by this group is planned to return to the question of isomerism in 100Y. In the meantime 2007Ha32, in mass measurements have confirmed the existence of isomerism in this nucleus but there is no information about half-life and spin assignments. Following 2007Ch07, evaluators have also assigned the state reported by 2007Ch07 to the ground state, even though, the spin of 3 proposed in this work is inconsistent with adopted Jπ=1-,2-. The source of 100Y produced by proton (30 MeV beam) fission of uranium.
2007Ha32: Precision measurement of masses of g.s. and isomer using JYFLTRAP at IGISOL facility in Jyvaskyla. In this work the ground state (most bound state) is populated with twice the intensity of the second (isomeric) state. But there is no information about spins and half-lives from this experiment. The source of 100Y produced by proton (30 MeV beam) fission of uranium, the same method as in 2007Ch07
2009Pe06, 2012Qu01: 100Y formed by fragmentation of 120 MeV/nucleon 136Xe beam at NSCL facility using Coupled Cyclotrons and A1900 fragment separator. Measured β and γ radiation, half-life of 100Y g.s. decay, and %β-n. Analysis used least-squares fits and maximum likelihood method
Theory references: consult the NSR database (www.nndc.bnl.gov/nsr/) for three primary references, two dealing with nuclear structure calculations and one with decay modes and half-lives.
With Nilsson configuration of π5/2[422]~#ν3/2[411] for the 1+ level at 10.7 keV and the 4+ isomer at 145 keV, Gallagher-Moszkowski rule would suggest that 4+ isomer should be lower in energy than the 1+ state. This anomaly is inexplicable in the present level scheme. Further experimental work is needed to confirm the relative positions of the 732-ms and 0.94S activities
Q-value: S(2n)=11175 14, S(2p)=27536 20, Q(β-n)=2222 15 (2017Wa10)
Q-value: Q(β-) measurement: 1984Pa19,1985IaZZ