ADOPTED LEVELS, GAMMAS for 35Ar

Authors: Lijie Sun and Jun Chen |  Citation: Nucl. Data Sheets 211, 1 (2026) |  Cutoff date: 30-Sep-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-11874.4 keV 9S(n)= 12740.3 keV 7S(p)= 5896.2 keV 7Q(α)= -6429.7 keV 7
Reference: 2021WA16

References:
  A  35K EC+B+ decay (175 MS)  B  36Ca εp decay (100.9 MS)
  C  1H(36Ar,d)  D  16O(24Mg,αnγ)
  E  24Mg(16O,αnγ)  F  32S(α,n)
  G  33S(3He,nγ)  H  35Cl(3He,t)
  I  36Ar(p,d)  J  36Ar(d,t)
  K  36Ar(3He,α) 

General Comments:

Isotope discovery (2012Th10): 32S(α,n)35Ar at Purdue (1940Ki12,1941Ki01,1941El04).

35Ar production:

2012Zh06: 9Be,181Ta(40Ar,X) at E(40Ar)=57 MeV/nucleon at HIRFL. Measured momentum distributions and production cross sections of fragments. Observed competition between projectile fragmentation and other mechanisms. Compared with EPAX, abrasion-ablation, and HIPSE models. Studied target dependence of fragment cross sections.

2007No13: 181Ta(40Ar,X) at E(40Ar)=100 MeV/nucleon at RIKEN. Measured fragment momentum distributions and production cross sections.

35Ar decay measurements:

35Ar produced via 35Cl(p,n)35Ar reaction (1985Da04,1984Ad01,1980Wi13,1979Ha04,1977Az01,1971Ge04, 1971De05,1969Wi18,1969Fr09,1960Wa04,1956Ki29). Measured ε+β+-delayed γ rays, decay branching ratios, and parent 35Ar T1/2.

35Ar radius measurements:

2002Oz03: C(35Ar,X) at E(35Ar)≈950 MeV/nucleon at RIKEN. Measured interaction cross sections. Deduced effective radii and proton skin features.

2000Ge20: 35Ar produced at ISOLDE. Measured β asymmetry and hyperfine structure using β-NMR spectroscopy. Deduced mean squared charge radii and quadrupole moments.

1996Kl04,1995KlZZ: 35Ar produced by ISOLDE. Measured isotope shifts and hyperfine structure using collinear fast-beam laser spectroscopy. Deduced mean square charge radii and electric quadrupole moments.

35Ar mass measurement: 2011Tu09.

Theoretical calculations: 2020Ri06, 2020RiZX, 2020RiZZ.

Q-value: S(2n)=29805.6 8, S(2p)=11039.4 7, Q(ε)=5966.2 7 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
      0.0ABCDEFG IJK 3/2+ 1.7755 s 14 
% ε = 100
     
   1184.08 25 ABC  FG IJK 1/2+     1184.1 3 
  100

      0.0
3/2+
   1750.78 22 A  DEFG IJK (5/2)+     1750.6 3 
  100

      0.0
3/2+
   2603.22 28    DE G     7/2(+)      851.9 9 
  2603.0 5 
   12.3 33 
  100 10 

Q
   1750.78
      0.0
(5/2)+
3/2+
   2638.01 26 A       IJK (3/2)+      886.8 5 
  2638.0 4 
   16 6 
  100 13 


   1750.78
      0.0
(5/2)+
3/2+
   2982.79 12 A C     IJK (5/2)+     1798.9 5 
  2982.68 13 
    3.5 6 
  100 4 


   1184.08
      0.0
1/2+
3/2+
   3196.98 26   CDE G IJK 7/2-      593.7 2 
  1446.2 2 
  3197.0 7 
   16.4 30 
  100 8 
   21 5 

D
Q
   2603.22
   1750.78
      0.0
7/2(+)
(5/2)+
3/2+
   3882 5           K 1/2+        
   4001 3           K 1/2-,3/2-        
   4065.0 4 ?A           (1/2+,3/2+,5/2+)     1426.8 4 
  100

   2638.01
(3/2)+
   4113 4           K        
   4135 4           K 1/2-,3/2-        
   4359.0 5    DE     K (9/2-)     1162.0 8 
  1756 1 
   65 24 
  100 15 
(D)

   3196.98
   2603.22
7/2-
7/2(+)
   4528.3 4 A         K (1/2+,3/2+,5/2+)     4527.9 7 
  100

      0.0
3/2+
   4725.9 6 A      HI K 1/2+     3542.0 6 
  4724.5 11 
  100 21 
   41 17 


   1184.08
      0.0
1/2+
3/2+
   4785.8 11 A      HI K 1/2+,3/2+,5/2+     4785.4 11 
  100

      0.0
3/2+
   5059 11         I K        
   5116 2        HI K 3/2+,5/2+        
   5207 3        H  K        
   5384.2 4    DE  HI K (11/2-)     1025.2 4 
  2187.1 4 
   14 4 
  100 6 

Q
   4359.0
   3196.98
(9/2-)
7/2-
   5482 2        H  K 3/2+,5/2+        
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   5572.67 15 A     G     3/2+     1044.4 4 
  1507.4 5 
  2589.8 1 
  2934.5 5 
  3821.7 7 
  4387.2 9 
  5572.3 10 
    2.5 8 
    3.7 8 
  100 4 
    6.7 12 
    6.7 14 
    6.7 16 
   11.7 31 







   4528.3
   4065.0
   2982.79
   2638.01
   1750.78
   1184.08
      0.0
(1/2+,3/2+,5/2+)
(1/2+,3/2+,5/2+)
(5/2)+
(3/2)+
(5/2)+
1/2+
3/2+
   5594 2   C    HI K 3/2+,5/2+        
   5613.6 9     E       (11/2-)     1254.6 8 
  100

   4359.0
(9/2-)
   5765.8 5    DE       (13/2-)      381.6 1 
  1406.9 7 
  100 10 
   17.2 35 
D
(Q)
   5384.2
   4359.0
(11/2-)
(9/2-)
   5915 3        H JK        
   5991 3          J         
   6037 3        HIJK 3/2+,5/2+        
   6055 3 ?         J         
   6076 3          J         
   6163 2          JK        
   6253 3          JK        
   6273 3          JK        
   6302 3          J         
   6332 3          J         
   6345 3 A        J  (1/2,3/2,5/2)        
   6415 2          J         
   6439 4 ?         J         
   6460 3          J         
   6523 3          J         
   6557 3          J         
   6585 3          J         
   6606 3         IJ         
   6616 2         IJK 1/2+        
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   6644 3         IJ         
   6651 3         IJ         
   6673 4         IJ  5/2-,7/2-        
   6823 2         I K 3/2+,5/2+        
   6948 2           K        
   7044 4 A       I K 3/2+,5/2+        
   7117 10           K        
   7255 11 A                  
   7289 10 A         K        
   7427 10 A         K        
   7509 10 A         K 1/2+,3/2+,5/2+        
   7840 10           K        
   8019 10           K        
   8109.7 13     E       (15/2-)     2342.6 28 
  2725.7 14 
  100 25 
   50 13 


   5765.8
   5384.2
(13/2-)
(11/2-)
   8212.6 8     E       (15/2-)     2446.6 16 
  2828.3 7 
   21 7 
  100 18 

Q
   5765.8
   5384.2
(13/2-)
(11/2-)
   8393 20 ?A           1/2+,3/2+,5/2+        
   9906.0 20     E       (19/2-)     1693.3 27 
  1796.3 25 
  100 20 
   67 20 
Q
Q
   8212.6
   8109.7
(15/2-)
(15/2-)
  12277.0 32     E       (23/2-)     2370.9 25 
  100
Q
   9906.0
(19/2-)

E(level): E(level) from a least-squares fit to γ-ray energies for levels connected with γ transitions; from particle-transfer reactions or 35K ε+β+-delayed proton decays for other levels.

M(γ): From (16O,αnγ) and/or (24Mg,αnγ). Stretched quadrupole (Q, ΔJ=2) or stretched dipole (d, ΔJ=1) transitions are assigned by evaluators based on the measured γγ(θ)(ADO) and/or ratios of yields R(γ(θ)) compared with the expected values given by the authors.

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Band based on f7/2 orbital.
   3196.98 26  7/2-        
   5384.2 4  (11/2-)     1025.2 4 
  2187.1 4 
   14 4 
  100 6 

Q
   4359.0
   3196.98
(9/2-)
7/2-
   8109.7 13  (15/2-)     2342.6 28 
  2725.7 14 
  100 25 
   50 13 


   5765.8
   5384.2
(13/2-)
(11/2-)
   9906.0 20  (19/2-)     1693.3 27 
  1796.3 25 
  100 20 
   67 20 
Q
Q
   8212.6
   8109.7
(15/2-)
(15/2-)
  12277.0 32  (23/2-)     2370.9 25 
  100
Q
   9906.0
(19/2-)

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.03/2+ 1.7755 s 14 
% ε = 100
μ=+0.6322 2 (2002Ma41,2019StZV), Q=-0.084 15 (1996Kl04,2021StZZ)
Evaluated rms nuclear charge radius R=3.3636 fm 42 (2013An02).
E(level): Evaluated rms nuclear charge radius R=3.3636 fm 42 (2013An02).
   1184.081/2+   XREF: F(890).
   1750.78(5/2)+   XREF: F(2030)I(1700)J(1700).
   2638.01(3/2)+   XREF: I(2615)K(2649).
   2982.79(5/2)+   XREF: I(2970).
   3196.987/2-   E(level): Band based on f7/2 orbital.
   4065.0(1/2+,3/2+,5/2+)   XREF: α(?).
   4528.3(1/2+,3/2+,5/2+)   XREF: K(4515).
   4725.91/2+   XREF: K(4713).
   4785.81/2+,3/2+,5/2+   XREF: K(4774).
   5384.2(11/2-)   XREF: I(5400).
E(level): Band based on f7/2 orbital.
   5572.673/2+   T=3/2
XREF: γ(5537).
   55943/2+,5/2+   Evaluators consider the 5994 level to be different from the 5572.67 t=3/2 level because (p,d) and (3He,α) from t=0 targets should not populate t=3/2 levels.
E(level): Evaluators consider the 5994 level to be different from the 5572.67 t=3/2 level because (p,d) and (3He,α) from t=0 targets should not populate t=3/2 levels.
   60373/2+,5/2+   XREF: I(6024).
   6055   XREF: J(?).
   6439   XREF: J(?).
   66735/2-,7/2-   XREF: I(6700).
   70443/2+,5/2+   XREF: I(7030).
   8109.7(15/2-)   E(level): Band based on f7/2 orbital.
   83931/2+,3/2+,5/2+   XREF: α(?).
   9906.0(19/2-)   E(level): Band based on f7/2 orbital.
  12277.0(23/2-)   E(level): Band based on f7/2 orbital.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   1184.08   1184.1E(γ): weighted average of 1184.0 3 from 35K ε decay and 1184.3 4 from 36Ca εp decay
   1750.78   1750.6E(γ): weighted average of 1750.5 3 from 35K ε decay, 1750.7 4 from (24Mg,αnγ), and 1750.8 5 from (16O,αnγ)
   2603.22    851.9E(γ): weighted average of 852 1 from (24Mg,αnγ) and 851.8 9 from (16O,αnγ)
I(γ): weighted average of 10 5 from (24Mg,αnγ) and 13.3 33 from (16O,αnγ)
   2603.0E(γ): weighted average of 2603.0 5 from (24Mg,αnγ) and 2602.6 15 from (16O,αnγ)
I(γ): other: 100 22 from (24Mg,αnγ)
   2638.01    886.8E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   2638.0E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   2982.79   1798.9E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   2982.68E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   3196.98    593.7E(γ): weighted average of 593 1 from (24Mg,αnγ) and 593.7 2 from (16O,αnγ)
I(γ): weighted average of 16 8 from (24Mg,αnγ) and 16.4 30 from (16O,αnγ)
   1446.2E(γ): weighted average of 1446.2 2 from (24Mg,αnγ), 1446.1 6 from (16O,αnγ), and 1446.0 6 from (3He,nγ)
I(γ): other: 100 9 from (24Mg,αnγ)
   3197.0E(γ): from (24Mg,αnγ). Other: 3197 6 from (16O,αnγ)
I(γ): weighted average of 18 5 from (24Mg,αnγ) and 24 5 from (16O,αnγ)
   4065.0   1426.8E(γ): From 35K ε decay.
   4359.0   1162.0E(γ): weighted average of 1162 1 from (24Mg,αnγ) and 1162.0 8 from (16O,αnγ)
I(γ): unweighted average of 41 11 from (24Mg,αnγ) and 88 18 from (16O,αnγ)
   1756E(γ): weighted average of 1756 1 from (24Mg,αnγ) and 1756.3 14 from (16O,αnγ)
I(γ): from (24Mg,αnγ). Other: 100 53 from (16O,αnγ)
   4528.3   4527.9E(γ): From 35K ε decay.
   4725.9   3542.0E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   4724.5E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   4785.8   4785.4E(γ): From 35K ε decay.
   5384.2   1025.2E(γ): weighted average of 1025 1 from (24Mg,αnγ) and 1025.2 4 from (16O,αnγ)
I(γ): weighted average of 21 8 from (24Mg,αnγ) and 12 4 from (16O,αnγ)
   2187.1E(γ): weighted average of 2187.4 4 from (24Mg,αnγ) and 2186.8 4 from (16O,αnγ)
I(γ): other: 100 13 from (24Mg,αnγ)
   5572.67   1044.4E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   1507.4E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   2589.8E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   2934.5E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   3821.7E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   4387.2E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
   5572.3E(γ): From 35K ε decay.
I(γ): From 35K ε decay.
E(level)E(gamma)Comments
   5765.8    381.6E(γ): weighted average of 381.6 1 from (24Mg,αnγ) and 381.5 3 from (16O,αnγ)

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