ADOPTED LEVELS, GAMMAS for 44K

Authors: Jun Chen and Balraj Singh |  Citation: Nucl. Data Sheets 190, 1 (2023) |  Cutoff date: 20-Jun-2023 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=5687.2 keV 5S(n)= 7277.4 keV 6S(p)= 11061 keV 5Q(α)= -10650 keV 30
Reference: 2021WA16

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

General Comments:

Mass measurements: 2012La05, 2007Ya08

Other measurements:

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

Giant resonances: 1988Vo06

Isotope shifts and hyperfine structure: 2021Ko08, 2019Ko19, 2014Pa45, 2014Kr04, 1982To02, 1982Du06

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

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

Theoretical structure calculations:

2022Do01: calculated odd-even staggering of binding energy, and charge radius.

1980Jo09: calculated levels, Jπ, B(M1), magnetic moment using shell model

Other theoretical calculations: seven other references for structure and two for radioactive decays retrieved from the NSR database (www.nndc.bnl.gov/nsr/) are listed in document records which can be accessed via web-based ENSDF database

Q-value: S(2n)=16902.1 4, S(2p)=25530 60 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABC 2- 22.13 m 19 
% β- = 100
     
   182.64 6 AB  (1-) < 0.9 ns    182.6 1 
  100
[M1+E2]
     0.0
2-
   382.85 8 ABC (3-) < 0.7 ns    382.84 10 
  100
[M1+E2]
     0.0
2-
   520.09 9 ABC (4-) < 0.7 ns    137.25 5 
   520.0 2 
  100.0 7 
   43.3 7 
[M1]
[E2]
   382.85
     0.0
(3-)
2-
   811.68 13  BC (5-)      291.6 1 
  100

   520.09
(4-)
   968.96 31  BC (3)      586.1 3 
  100

   382.85
(3-)
  1013.59 12  BC (4+)      202.7 10 
   630.7 1 
  <10
  100


   811.68
   382.85
(5-)
(3-)
  1051.30 8 AB  (3-)      531.2 3 
  1051.3 1 
    3.2 6 
  100.0 6 


   520.09
     0.0
(4-)
2-
  1076.79 7 AB  (2-)      693.8 2 
   894.2 1 
  1076.6 1 
   24.6 39 
   68.5 48 
  100.0 54 



   382.85
   182.64
     0.0
(3-)
(1-)
2-
  1241.04 17   C      227.40 15 
   721.2 4 
  100
   43


  1013.59
   520.09
(4+)
(4-)
  1367.94 18   C < 0.7 ns    126.9 1 
   556.3 3 
  100
   18


  1241.04
   811.68

(5-)
  1459.39 7 A   (1-)      408.1 1 
  1276.6 1 
  1460.0 1 
  100.0 38 
   37.3 27 
   52.8 34 



  1051.30
   182.64
     0.0
(3-)
(1-)
2-
  1480 10  B  (1+)        
  1500 15  B         
  1886.05 6 A   1+      426.7 1 
   809.1 1 
  1703.4 1 
  1886.1 1 
    4.58 17 
    3.44 33 
  100.0 38 
   55.6 18 




  1459.39
  1076.79
   182.64
     0.0
(1-)
(2-)
(1-)
2-
  1990 20  B         
  2060 20  B  (5+,4-)        
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2325.92 18 A   1+      866.1 10 
  2143.5 4 
  2325.8 2 
  100.0 56 
   48.4 30 
   50.8 30 



  1459.39
   182.64
     0.0
(1-)
(1-)
2-
  2574.11 12 A   1+     1114.7 1 
  100

  1459.39
(1-)

E(level): From a least-squares fit to γ-ray energies. In the fitting procedure, ΔEγ for 1460.0γ has been doubled so that the reduced χ2 gets decreased to an acceptable value of 2.0 from 3.1.

Jπ(level): For ten levels, Jπ values from fits of experimental σ(θ) data in 44Ca(t,3He) reaction to CCBA (coupled-channel Born approximation) theoretical calculations with assumed L-transfers, using CHUCK computer code, are listed (1985Aj03).

T1/2(level): From γγ(t) in (p,αnγ) (1980Ma13) for excited states

Back to top

Back to top

Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   182.64 (1-) < 0.9 ns    182.6 1 [M1+E2]0.013α=0.013 10
   520.09 (4-) < 0.7 ns    137.25 5 [M1]0.00494B(M1)(W.u.)>0.0084, α=0.00494 7
(4-) < 0.7 ns    520.0 2 [E2]B(E2)(W.u.)>0.65

Back to top

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 (1982To02,1982Du06,2019StZV)
Measured δ<r2>(47K,44K)=+0.036 fm2 5(stat) 51(syst) from δν(47K,44K)=-292.1 MHz 5(stat) 10(syst) (2014Kr04).
E(level): Measured δ<r2>(47K,44K)=+0.036 fm2 5(stat) 51(syst) from δν(47K,44K)=-292.1 MHz 5(stat) 10(syst) (2014Kr04).
   182.64(1-) < 0.9 ns Level is weakly populated in (t,3He).
E(level): Level is weakly populated in (t,3He).
  1013.59(4+)   XREF: B(1003).

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
   382.85   382.84E(γ): weighted average of 382.9 1 from 44Ar β- decay and 382.70 15 from (p,αnγ)
   520.09   137.25E(γ): other: 137.3 3 from 44Ar β- decay. From (α,pnγ).
M(γ): multipolarity cannot be E2 as B(E2)(W.u.) would exceed RUL=100
   520.0E(γ): weighted average of 519.4 4 from 44Ar β- decay and 520.0 1 from (p,αnγ)
I(γ): other: 35 from (p,αnγ)
   811.68   291.6E(γ): From (α,pnγ).
   968.96   586.1E(γ): From (α,pnγ).
  1013.59   202.7E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
   630.7E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
  1241.04   227.40E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
   721.2E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
  1367.94   126.9E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
   556.3E(γ): From (α,pnγ).
I(γ): From (α,pnγ).
  1459.39  1460.0E(γ): poor fit; level-energy difference=1459.37 7

Back to top