ADOPTED LEVELS, GAMMAS for 216Ac

Author: S. -c. Wu |  Citation: Nucl. Data Sheets 108, 1057 (2007) |  Cutoff date: 1-Mar-2007 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-2154 keV 17S(n)= 5958 keV 17S(p)= 1679 keV 14Q(α)= 9235 keV 7
Reference: 2012WA38

References:
  A  (HI,xnγ)  B  220Pa α decay

General Comments:

Calculations:

Spontaneous emission of heavy ions: 1986Po06

Q-value: Note: Current evaluation has used the following Q record -2182 30 5960 30 1700 28 9235 6 2003Au03








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		Final Levels
      0 B (1-) 440 µs 16 
% α = 100
   
     48 7  B (9-) 441 µs 7 
% α = 100
   
      0.0+XA       
  322+XA  ≈ 300 ns   322
      0.0+X

Jπ(level): 1970To18 suggest Jπ(g.s.)=1- and Jπ(48)=(9-) on the basis of analogy with 212At and 214Fr. The low relative cross section and the shift to lower energy of the peak in the excitation function suggest, again in analogy with 212At and 214Fr, that the ground state is the low-spin member of the two activities. Probable configuration=((π 1h9/2)(ν 2g9/2))

T1/2(level): Many α-decay works, except that of 2000He17, are unable to separate the peaks decaying from the two states, hence the T1/2’s measured are not adopted.

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0(1-) 440 µs 16 
% α = 100
Eα=9052 keV 10 (2000He17); 9072 keV 8 (1970To18,1991Ry01) to the ground state of 212Fr.
E(level): Eα=9052 keV 10 (2000He17); 9072 keV 8 (1970To18,1991Ry01) to the ground state of 212Fr.
     48(9-) 441 µs 7 
% α = 100
Eα=9105 keV 7 (2004Ku24); 9110 keV 10 (2000He17) and 9108 keV 5 (1970To18) to the ground state of 212Fr.
E(level): Eα=9105 keV 7 (2004Ku24); 9110 keV 10 (2000He17) and 9108 keV 5 (1970To18) to the ground state of 212Fr.

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