ADOPTED LEVELS, GAMMAS for 44K

Authors: Jun Chen, Balraj Singh and John A. Cameron |  Citation: Nucl. Data Sheets 112, 2357 (2011) |  Cutoff date: 31-Jul-2011 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=5687.2 keV 6S(n)= 7277.4 keV 6S(p)= 11061 keV 6Q(α)= -1.065×104 keV 4
Reference: 2012WA38

References:
  A  44Ar β- decay (11.87 M)  B  44Ca(t,3He)
  C  48Ca(p,αnγ) 

General Comments:

Other measurements:

Reaction cross sections and radii for f-p shell nuclei: 1997Li15

Giant resonances: 1988Vo06

Isotope shifts and hyperfine structure: 1982To02, 1982Du06

1999Ai02: 44K beam from 55Mn fragmentation, Si(44K,X) studied.

44Ca(n,p): 1999Ar19, 1988Ma53, 1986Pe06, 1985Gu17, 1977Mo05, 1968Le25

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

Q-value: S(2n)=16902.09 43, S(2p)=25450 140 (2011AuZZ)

Q-value: Values in 2003Au03: Q(β-)=5660 40, S(n)=7290 40, S(p)=11090 40, Q(α)=-10680 50, S(2n)=16930 40, S(2p)=25470 150









E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)Final Levels
     0.0ABC 2- 22.13 m 19 
% β- = 100
    
   182.71 6 AB  (1,2,3+) < 0.9 ns    182.6 1 
  100
     0.0
2-
   382.78 7 ABC < 0.7 ns    382.73 9 
  100
     0.0
2-
   520.02 7 ABC < 0.7 ns    137.25 5 
   520.0 1 
  100.0 7 
   43.3 7 
   382.78
     0.0

2-
   811.62 12  BC      291.6 1 
  100
   520.02

   968.9 3  BC      586.1 3 
  100
   382.78

  1013.51 12  BC      202.7 10 ?
   630.7 1 
  <10
  100
   811.62
   382.78


  1051.38 8 AB       531.2 3 
  1051.3 1 
    3.2 6 
  100.0 6 
   520.02
     0.0

2-
  1076.83 7 AB       693.8 2 
   894.2 1 
  1076.6 1 
   25 4 
   67 6 
  100 6 
   382.78
   182.71
     0.0

(1,2,3+)
2-
  1240.96 16   C      227.40 15 
   721.2 4 
  100
   43
  1013.51
   520.02


  1367.87 18   C < 0.7 ns    126.9 1 
   556.3 3 
  100
   18
  1240.96
   811.62


  1459.56 6 A   (0-,1)      408.1 1 
  1276.6 1 
  1460.0 1 
  100 4 
   38 3 
   53 4 
  1051.38
   182.71
     0.0

(1,2,3+)
2-
  1480 10  B        
  1500 15  B        
  1886.12 7 A   1+      426.7 1 
   809.1 1 
  1703.4 1 
  1886.1 1 
    4.6 2 
    3.4 3 
  100 3 
   55.7 18 
  1459.56
  1076.83
   182.71
     0.0
(0-,1)

(1,2,3+)
2-
  1990 20  B        
  2060 20  B        
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)Final Levels
  2325.94 18 A   1+      866.1 10 
  2143.5 4 
  2325.8 2 
  100 6 
   49 3 
   51 3 
  1459.56
   182.71
     0.0
(0-,1)
(1,2,3+)
2-
  2574.28 12 A   1+     1114.7 1 
  100
  1459.56
(0-,1)

E(level): From least-squares fit to Eγ’s

T1/2(level): γγ(t) for excited states

E(γ): From β- decay and (α,pnγ). Weighted average taken when available, unless otherwise noted.

I(γ): From β- decay.

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.02- 22.13 m 19 
% β- = 100
μ=-0.856 4 (1982To02,1982Du06,1989Ra17,2005St24)
The rms charge radius (<r2>)1/2=3.456 fm 10 (2004An14 evaluation, same value in 2008 update).
   182.71(1,2,3+) < 0.9 ns Populated weakly in (t,3He).
  1480   E(level): Energy from (α,pnγ), intensity from 44Ar β- decay. Level at 1480 associated with the 1459.5 level, and the level at 1500 lowered by 20 keV by 1990En08.
  1500   E(level): Energy from (α,pnγ), intensity from 44Ar β- decay. Level at 1480 associated with the 1459.5 level, and the level at 1500 lowered by 20 keV by 1990En08.
  1990   E(level): Poor fit. Level-energy difference=1459.6. Probable multiplet.
  2060   E(level): Poor fit. Level-energy difference=1459.6. Probable multiplet.

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