ADOPTED LEVELS for 206Ac
Author: F.G. Kondev | Citation: Nucl. Data Sheets 109, 1527 (2008) | Cutoff date: 31-Jan-2008
Full ENSDF file | Adopted Levels (PDF version)
| S(p)= -3.3×102 keV SY | Q(α)= 7.94×103 keV 5 | ||||
| Reference: 2012WA38 |
| E(level) (keV) | Jπ(level) | T1/2(level) |
| 0.0 | (3+) | 22 ms +9-5 % α ≈ 100 |
| 0.0+X | (10-) | 33 ms +22-9 % α ≈ 100 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3+) | 22 ms +9-5 % α ≈ 100 | Configuration=((π h9/2)(ν f5/2))3+. The assignment is tentative. |
| 0.0+X | (10-) | 33 ms +22-9 % α ≈ 100 | Configuration=((π h9/2)(ν i13/2))10-. The assignment is tentative. |
1998Es02: activity produced by bombarding a 320 μg/cm thick 175Lu target with 199-MeV 36Ar ions. The reaction products were separated by a gas-filled separator (RITU) and implanted into a position sensitive PIPS detector (800 mm wide and 35 mm high). Separate amplified branches for energy ranges 0.5-15 MeV (α-decay) and 2-200 MeV (reaction residues) were used. Two α decaying states were identified, one using 9 quadrupole (recoil-α1-α2-α{-3) and 2 triple (recoil-α1-α3) (Eα2 missing) events 7790 keV 30 (α1), 7236 keV 7 (α2), 6752 keV 6 (α3) associated with the (3+) state and the other using 5 quadrupole and 1 triple (Eα2 missing) events 7750 keV 20 (α1), 7248 keV 13 (α2) and 6858 keV 7 (α3) associated with the (10-) isomer. The assignment to a specific state is based on the time and position correlations with known α-decays of 202Fr, 198At and 194Bi
1998LuZV: activity produced by bombarding a 307 μg/cm2 hafnium target (64.6% 176Hf,21.7% 177Hf, 6.8% 178Hf, 2.2% 179Hf and 4.7% 180Hf) with 186-MeV (effective energy at half-target thickness) 35Cl ions (beam intensity was about 600 enA). The reaction products were separated by a recoil mass separator at JAERI and implanted on position sensitive silicon detector. Two α decaying states were identified, one using 4 quadrupole (recoil-α1-α2-α{-3) and one triple (recoil-α1-α2) events 7894 keV 50 (α1), 7183 keV 50 (α2) and 6742 keV 50 (α3) and the other using 3 triple events (recoil-α1-α3) (Eα2 missing) 7772 keV 50 (α1) and 6760 keV (α3).
The results from 1998Es02 are recommended. Note, the discrepant Eα2 energy (202Fr) in 1998LuZV
Q-value: Note: Current evaluation has used the following Q record 7940 50 2003Au03