ADOPTED LEVELS for 226Ac

Author: Y. A. Akovali |  Citation: Nucl. Data Sheets 77,433 (1996) |  Cutoff date: 1-Feb-1996 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1113 keV 5S(n)= 5399 keV 6S(p)= 4973 keV 4Q(α)= 5536 keV 22
Reference: 2012WA38

References:
  A  230Pa α decay 

General Comments:

The superdeformation properties, such as deformation parameters, level energy and potential-well depth, were calculated by 1992Ch20.

Search for a fissioning isomer was carried out by 1972Ku26 via the 226Ra(d,xn) reaction; no SF isomer was observed.

See 1984Ro23 and 1980Ku14 for calculations and discussions on the fission barriers.

For calculation of 5He emission probability, see 1984Po11.

Q-value: Note: Current evaluation has used the following Q record






E(level)
(keV)
XREFJπ(level) T1/2(level)
    0.0A (1) 29.37 h 12 
% β- = 83 3
% ε = 17 3
% α = 6×10-3 2
    5.1 13 A  
   18.8 10 A  
   33.3 10 A  
   45.0 10 A  
   58.3 17 A  
   70.3 10 A  
   77.7 10 A  
  130.4 17 A  
  165 4 A  
  195 3 A  
  230 4 A  
  265 3 A  
  290 4 A  
  378 3 A  
  418 4 A  
  556 6 ?A  
  589 3 A (2-)  

Back to top

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    0.0(1) 29.37 h 12 
% β- = 83 3
% ε = 17 3
% α = 6×10-3 2
α branching was deduced by 1975VaZD; β and ε branchings have been determined from relative γ intensities measured by 1974Va28 in 226Ac β- and ε decays. The measured radium K x-ray intensity (corrected for radium x rays from 226Th α decay) and theoretical εK/ε ratios for the 226Ac ε decay, measured β intensity to 230-keV level in 226Th for the 226Ac β- decay have been used to calculate the ε/β- ratio. ε/β-=62 10/309 17 was obtained by the evaluator.
E(level): α branching was deduced by 1975VaZD; β and ε branchings have been determined from relative γ intensities measured by 1974Va28 in 226Ac β- and ε decays. The measured radium K x-ray intensity (corrected for radium x rays from 226Th α decay) and theoretical εK/ε ratios for the 226Ac ε decay, measured β intensity to 230-keV level in 226Th for the 226Ac β- decay have been used to calculate the ε/β- ratio. ε/β-=62 10/309 17 was obtained by the evaluator.

Back to top