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 SYQ(α)= 7.94×103 keV 5
Reference: 2012WA38

General Comments:

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-α12-α{-3) and 2 triple (recoil-α13) (Eα2 missing) events 7790 keV 301), 7236 keV 72), 6752 keV 63) associated with the (3+) state and the other using 5 quadrupole and 1 triple (Eα2 missing) events 7750 keV 201), 7248 keV 132) and 6858 keV 73) 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-α12-α{-3) and one triple (recoil-α12) events 7894 keV 501), 7183 keV 502) and 6742 keV 503) and the other using 3 triple events (recoil-α13) (Eα2 missing) 7772 keV 501) 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





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

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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.

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