ADOPTED LEVELS, GAMMAS for 44Ar

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-)=3108.2 keV 16S(n)= 8735 keV 6S(p)= 15800 keV 60Q(α)= -12260 keV 4
Reference: 2021WA16

References:
  A  44Cl β- decay (0.54 S)  B  45Cl β-n decay
  C  48Ca(3He,7Be)  D  48Ca(48Ca,44ArG)
  E  208Pb(48Ca,xγ)  F  C(46K,pnγ)
  G  Coulomb Excitation 

General Comments:

Other measurements:

T1/2 of 44Ar: 1970Hu11, 1969La16

1971Ar32: 232Th(40Ar,X), E=290 MeV, measured fragments isotopic yields.

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

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

2001Sc01: 1H(44Ar,44Ar’) E=33.0 MeV and 44Ar(p,p’) E=33.2 MeV, measured cross section, deduced B(E2)

2001Vo09: 48Ca(p,pα), populated ground state of daughter nucleus

2004De41: natCu(7Li,X), E=35 MeV, measured cross-section

2006Ro34: 2H(48Ca,X), measured production cross-section

Mass measurement: 2003Bl17

Theoretical structure calculations:

2021Pe14: calculated potential energy curves as function of deformation parameter β2 using constrained axial RHB method.

2021Su18: calculated potential energy surfaces, occupation numbers for ground state in (β,γ) plane, energies, spins, B(E2) and quadrupole moments of low-lying positive-parity levels using antisymmetrized molecular dynamics (AMD) with Gogny D1S density functional.

2013Wa05: calculated single-particle levels, Jπ occupational probabilities, proton density distributions using Skyrme-Hartree-Fock approach

2011Ka03: calculated energy, B(E2) and quadrupole moment of first 2+ state using shell model with the extended pairing plus quadrupole-quadrupole forces

2009Ro08: theory: calculated levels, Jπ, g factors, B(E2), configurations using shell model with WBT and SDPF-U interactions.

1997Re04: calculated 2+ levels using shell model.

Other theoretical calculations: 26 references for structure and one 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)=14393 6, S(2p)=29613 3 (2021Wa16)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABCDEFG 0+ 11.87 m 5 
% β- = 100
     
   750 30 ?  C     (0+)        
  1158.14 11 AB DEFG 2+ 3.80 ps +49-33    1158.11 12 
  100
E2
     0.0
0+
  1610 30   C     (2+)        
     1.78E3 8 ?     F      1780 80 ?
 

     0.0
0+
  2010.93 14 AB    G (2+) 1.53 ps +20-17     852.77 10 
  2010.18 18 
  100.0 21 
   68.8 21 
[M1,E2]
[E2]
  1158.14
     0.0
2+
0+
  2746.37 30 A  DEF  (4+) 2.7 ps +25-20    1588.1 3 
  2747.0 8 ?
  100 8 
   47 8 
[E2]
[E4]
  1158.14
     0.0
2+
0+
  2976.25 17 A            965.32 12 
  1817.7 3 
  100 7 
   47 5 


  2010.93
  1158.14
(2+)
2+
  3439.4 11   CDE   (6+) > 27.7 ps    693
  100
[E2]
  2746.37
(4+)
  3980 50   C            
  4430 40   C            
  4807.68 28 A           2796.0 4 
  3649.8
  4808.0
  100
 
 



  2010.93
  1158.14
     0.0
(2+)
2+
0+
  5352.22 29 A           2375.6 3 
  3338.4 15 
  4195.0
  100 6 
   41 8 
 



  2976.25
  2010.93
  1158.14

(2+)
2+

E(level): From a least-squares to Eγ data for levels populated in γ-ray studies. Others are from reaction studies. Where ΔEγ is not available, it is assumed to be 0.5 keV for Eγ quoted to nearest tenth keV and 1.0 keV for Eγ quoted to nearest keV. In the fitting procedure, Δ|Eγ for 2010.18γ has been increased to 0.5 keV from 0.18 keV to decrease the reduced χ2 to 2.68 from 3.92

Jπ(level): Predicted from Shell Model calculations (1999Wa21,2000Fo03,1976Cr03) and systematics of even-even nuclei, unless otherwise noted.

T1/2(level): From the differential recoil distance Doppler shift (RDDS) method in 208Pb(48Ca,Xγ), unless otherwise noted

Back to top

Back to top

Additional Gamma Data:











E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityAdditional Data
  1158.14 2+ 3.80 ps +49-33    1158.11 12 E2B(E2)(W.u.)=7.8 +7-9
  2010.93 (2+) 1.53 ps +20-17    2010.18 18 [E2]B(E2)(W.u.)=0.50 6
  2746.37 (4+) 2.7 ps +25-20    1588.1 3 [E2]B(E2)(W.u.)=1.5 +20-8
  3439.4 (6+) > 27.7 ps    693[E2]B(E2)(W.u.)<14

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 11.87 m 5 
% β- = 100
Measured rms charge radius (<r2>)1/2=3.4454 fm 22 from δ<r2>(44Ar-38Ar)=+0.289 fm2 9(stat) 81(syst) (2008Bl01, laser spectroscopy).
E(level): Measured rms charge radius (<r2>)1/2=3.4454 fm 22 from δ<r2>(44Ar-38Ar)=+0.289 fm2 9(stat) 81(syst) (2008Bl01, laser spectroscopy).
  1158.142+ 3.80 ps +49-33  Q=-0.083 30 (2009Zi01), B(E2)=0.0360 +34-41
XREF: F(1110).
  2746.37(4+) 2.7 ps +25-20  XREF: F(2610).
  3439.4(6+) > 27.7 ps XREF: C(3480).

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
  1158.14  1158.11E(γ): other: 1110 80 from (46K,pnγ)
     1.78E3  1780E(γ): From C(46K,pnγ)
  2010.93  2010.18E(γ): other: 2010.6 from 45Cl β-n decay with Iγ=60
  2746.37  1588.1E(γ): other: 1500 80 from (46K,pnγ)

Back to top