ADOPTED LEVELS, GAMMAS for 246Am

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 112, 1833 (2011) |  Cutoff date: 1-Jan-2011 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=2377 keV SYS(n)= 4978 keV SYS(p)= 5473 keV SYQ(α)= 5.15×103 keV SY
Reference: 2012WA38

References:
  A  246Pu β- decay 

General Comments:

Compilations, calculations:

β-decay: 2009So02, 1992So06

Levels, odd-odd actinides: 1994So16

Long-lived isomers: 1987So10

Two-particle band-head energies: 1984So03

Binding energies: 2005Do12

Spontaneous fission half-life: 2005Re16

Gammas: All γ data are from 246Pu β- decay (1971Mu05)

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










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
      0.0A (7-) 39 m 3 
% β- = 100
     
      0.0+XA 2(-) 25.0 m 2 
% β- = 100
% IT < 0.02
     
     16.22+X 3 A (0-,1-,2-)      16.23 3 S
  100

      0.0+X
2(-)
     43.81+X 2 A (1+) 4.3 ns 3     27.58 2 
   43.81 2 
   14.1 15 
  100 5 
(E1)
(E1)
     16.22+X
      0.0+X
(0-,1-,2-)
2(-)
     74.34+X 5 A        
    223.74+X 2 A (1+)     149.42 3 
  179.94 2 
  223.75 2 
    0.24 20 
   41.3 20 
  100 7 

(M1)
(E1)
     74.34+X
     43.81+X
      0.0+X

(1+)
2(-)
    232.77+X 2 A     158.42 3 
  189.00 4 
  216.55 4 
  232.75 2 
   31 7 
   42 7 
  100 16 
   71 11 




     74.34+X
     43.81+X
     16.22+X
      0.0+X

(1+)
(0-,1-,2-)
2(-)
    299.37+X 2 A 0-,1      66.60 2 
   75.64 2 
  255.54 3 
  299.34 6 
  100 7 
   71 10 
   90 7 
   12 3 




    232.77+X
    223.74+X
     43.81+X
      0.0+X

(1+)
(1+)
2(-)
  ≈2000  73 µs 10 
% SF ≤ 100
     

E(level): From 246Pu β- decay, unless otherwise noted.

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
     43.81+X (1+) 4.3 ns 3     27.58 2 (E1)3.97B(E1)(W.u.)=9.3E-5 13, α=3.97
(1+) 4.3 ns 3     43.81 2 (E1)1.19B(E1)(W.u.)=0.000165 17, α=1.19
    223.74+X (1+)     179.94 2 (M1)5.86α=5.86
(1+)     223.75 2 (E1)0.0819α=0.0819

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.0(7-) 39 m 3 
% β- = 100
Configuration=((π 5/2[642])+(ν 9/2[734])) (1984So03).
Jπ(level): From single-particle systematics: for Z=95 the proton configuration is either 5/2[642] or 5/2[523] and for n=151 the neutron configuration is 9/2[734]. β decay to 246Cm suggests a spin-flip transition, therefore proton configuration=(π 5/2[642]) is preferred.
      0.0+X2(-) 25.0 m 2 
% β- = 100
% IT < 0.02
%IT from Iγ(153) 6+ to 4+ transition in 246Cm (see 246Am (25 min) decay).
E(level): %IT from Iγ(153) 6+ to 4+ transition in 246Cm (see 246Am (25 min) decay).
Jπ(level): From single-particle systematics: for Z=95 the proton configuration is either 5/2[642] or 5/2[523] and for n=151 the neutron configuration is 9/2[734]. β decay to 246Cm suggests a spin-flip transition, therefore proton configuration=(π 5/2[642]) is preferred.
   2000 73 µs 10 
% SF ≤ 100
Fission isomer observed in 244Pu(α,pn) (1972Wo07,2002Si26).
E(level): Fission isomer observed in 244Pu(α,pn) (1972Wo07,2002Si26).

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