ADOPTED LEVELS, GAMMAS for 229Ra

Authors: F.G. Kondev, J.K. Tuli and E. Browne |  Citation: Nucl. Data Sheets 208, 397 (2026) |  Cutoff date: 23-Oct-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1872 keV 20S(n)= 4450 keV 16S(p)= 8111 keV 17Q(α)= 3603 keV 19
Reference: 2021WA16

References:
  A  229Fr β- decay 








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0A 5/2+ 4.0 m 2 
% β- = 100
     
    41.25 8 A 7/2+       41.3
  100
M1(+E2)
     0.0
5/2+
   107.05 6 A 5/2+       65.8 1 
   107.1 1 
  100 8 
   57 4 
M1+E2
M1+E2
    41.25
     0.0
7/2+
5/2+
   137.45 6 A (5/2)- 0.66 ns 4      96.2 1 
   137.5 1 
   10.3 8 
  100 5 
E1
E1
    41.25
     0.0
7/2+
5/2+
   142.67 5 A 1/2+ 17.23 ns 12      35.6
   142.7 1 
    0.115 35 
  100.0 11 
(E2)
E2
   107.05
     0.0
5/2+
5/2+
   168.74 5 A (3/2)+ 106 ps 18      26.1
    61.8 1 
   168.8 1 
   22 4 
   29.3 22 
  100 4 
[M1]
M1+E2
M1(+E2)
   142.67
   107.05
     0.0
1/2+
5/2+
5/2+
   212.91 6 A (3/2)+ 18 ps 14      44.3 2 
    70.3 2 
    75.1 1 ?
   105.9 1 
   212.9 1 
    7.0 9 
    4.4 7 
    5.3 20 
   13.9 12 
  100 7 
M1+E2
[M1]
[E1]
[M1]
M1+E2
   168.74
   142.67
   137.45
   107.05
     0.0
(3/2)+
1/2+
(5/2)-
5/2+
5/2+
   478.86 6 A (1/2)- ≤ 30 ps    266.0 1 
   310.1 1 
   336.2 1 
   341.4 1 
   13.3 4 
  100 4 
   72
    1.41 7 
E1
E1
E1
(E2)
   212.91
   168.74
   142.67
   137.45
(3/2)+
(3/2)+
1/2+
(5/2)-
   501.37 7 A (5/2+)      332.5 1 
   358.7 1 
   363.9 1 
   15.3 21 
  100 8 
    9.1 15 

(E2)

   168.74
   142.67
   137.45
(3/2)+
1/2+
(5/2)-
   518.18 9 A (3/2)-      305.3 3 
   349.5 1 
   375.5 2 
   380.6 4 
    4.5 4 
  100 4 
   49.7 16 
    1.9 5 

E1


   212.91
   168.74
   142.67
   137.45
(3/2)+
(3/2)+
1/2+
(5/2)-
   541.46 7 A (3/2-)      372.8 2 
   398.7 1 
   404.1 1 
   22.5 27 
  100 8 
   49 5 
(E1)

(M1)
   168.74
   142.67
   137.45
(3/2)+
1/2+
(5/2)-
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   550.85 9 A (3/2)-      413.6 2 
   550.8 1 
   65 12 
  100 10 
M1(+E2)

   137.45
     0.0
(5/2)-
5/2+
   563.07 9 A (1/2+,3/2)      394.8 2 
   562.9 1 
   70 11 
  100 7 


   168.74
     0.0
(3/2)+
5/2+
   565.64 8 A 3/2-      352.7 1 
   428.1 1 
   21.7 13 
  100 6 

M1+E2
   212.91
   137.45
(3/2)+
(5/2)-
   598.26 10 A (1/2+,3/2)      455.6 1 
   598.2 2 
   86 6 
  100 10 


   142.67
     0.0
1/2+
5/2+
   665.07 11 A (1/2+,3/2)      522.4 1 
   665.1 3 
   82 6 
  100 13 


   142.67
     0.0
1/2+
5/2+
   752.91 9 A (3/2)-      211.5 1 
   274.1 1 
   615.1 2 
   645.4 2 ?
   25 4 
   38.8 25 
  100 10 
   94 8 

M1(+E2)


   541.46
   478.86
   137.45
   107.05
(3/2-)
(1/2)-
(5/2)-
5/2+
   773.21 31 A (1/2,3/2)      560.3 3 
  100

   212.91
(3/2)+
   813.88 14 A (1/2,3/2)      149.4 2 ?
   601.0 2 
   671.2 2 
   30.7 20 
   17 4 
  100 10 



   665.07
   212.91
   142.67
(1/2+,3/2)
(3/2)+
1/2+
   835.90 19 A (1/2+,3/2)      334.3 5 
   667.7 4 
   693.2 3 
   98 33 
   93 17 
  100 13 



   501.37
   168.74
   142.67
(5/2+)
(3/2)+
1/2+
   870.88 11 A (1/2+,3/2)      727.9 2 
   763.6 2 
   871.0 2 
   60 6 
   41 6 
  100 9 



   142.67
   107.05
     0.0
1/2+
5/2+
5/2+
   934.62 18 A (1/2+,3/2)      792.1 3 
   827.5 2 
   95 24 
  100 10 


   142.67
   107.05
1/2+
5/2+
  1042.00 27 A (1/2+,3/2)      899.4 3 
  1041.7 6 
  100 12 
   18 9 


   142.67
     0.0
1/2+
5/2+
  1322.64 22 A (1/2,3/2)      757.0 2 
  100

   565.64
3/2-
  1340.02 13 A (1/2,3/2)      587.1 1 
  100

   752.91
(3/2)-
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1376.12 20 A (1/2,3/2)      441.5 1 
  100

   934.62
(1/2+,3/2)
  1410.09 11 A (1/2+,3/2)      844.3 2 
   908.6 2 
  1197.3 2 
  1267.5 4 
  1410.3 3 
   30 4 
  100 11 
   76 8 
  100 30 
    8.9 18 





   565.64
   501.37
   212.91
   142.67
     0.0
3/2-
(5/2+)
(3/2)+
1/2+
5/2+
  1424.87 7 A (3/2)      611.1 4 
   858.9 2 
   861.6 2 
   883.3 2 
   923.1 2 
  1256.2 1 
  1282.3 1 
  1288.0 3 
   13 3 
    8.3 13 
   11.0 13 
   15.7 17 
    8.1 10 
  100 10 
   36 4 
    3.8 6 








   813.88
   565.64
   563.07
   541.46
   501.37
   168.74
   142.67
   137.45
(1/2,3/2)
3/2-
(1/2+,3/2)
(3/2-)
(5/2+)
(3/2)+
1/2+
(5/2)-
  1437.02 13 A (3/2+)      919.1 2 
  1267.9 2 
  1300.1 4 
  1395.7 3 
   23 5 
  100 20 
    7.8 17 
    8.8 17 




   518.18
   168.74
   137.45
    41.25
(3/2)-
(3/2)+
(5/2)-
7/2+
  1461.30 11 A (1/2-,3/2)      525.6 1 ?
   590.0 2 
   625.6 3 
   943.1 2 
  1248.4 2 
  1292.8 2 
  1324.0 3 
   28.9 19 
   34 3 
   18.7 21 
   17.3 18 
    9.9 11 
  100 10 
    6.9 17 







   934.62
   870.88
   835.90
   518.18
   212.91
   168.74
   137.45
(1/2+,3/2)
(1/2+,3/2)
(1/2+,3/2)
(3/2)-
(3/2)+
(3/2)+
(5/2)-
  1608.76 15 A (1/2,3/2)     1440.0 2 
  1466.1 2 
  100 10 
   72 7 


   168.74
   142.67
(3/2)+
1/2+
  1696.85 18 A (1/2,3/2)     1178.6 2 
  1554.3 3 
  100 10 
   61 8 


   518.18
   142.67
(3/2)-
1/2+
  1720.54 19 A (1/2,3/2)      310.3 4 
  1577.9 2 
    1.0E+2 4 
   21.2 21 


  1410.09
   142.67
(1/2+,3/2)
1/2+

E(level): From a least-squares fit to Eγ. Reduced χ2=1.069, compared to the critical value of χ2=1.501

Back to top

Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Kπ=1/2-, ν1/2[501] band
   478.86 6  (1/2)- ≤ 30 ps      
   518.18 9  (3/2)-      305.3 3 
   349.5 1 
   375.5 2 
   380.6 4 
    4.5 4 
  100 4 
   49.7 16 
    1.9 5 

E1


   212.91
   168.74
   142.67
   137.45
(3/2)+
(3/2)+
1/2+
(5/2)-
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Kπ=1/2+, ν1/2[631] band
   142.67 5  1/2+ 17.23 ns 12       
   168.74 5  (3/2)+ 106 ps 18      26.1
    61.8 1 
   168.8 1 
   22 4 
   29.3 22 
  100 4 
[M1]
M1+E2
M1(+E2)
   142.67
   107.05
     0.0
1/2+
5/2+
5/2+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Kπ=3/2+, ν3/2[631] and ν3/2[642] state
   212.91 6  (3/2)+ 18 ps 14       
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Kπ=5/2+, ν5/2[633] band
     0.0 5/2+ 4.0 m 2 
% β- = 100
     
    41.25 8  7/2+       41.3
  100
M1(+E2)
     0.0
5/2+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 5 - Kπ=5/2+, ν5/2[622] state
   107.05 6  5/2+        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 6 - Kπ=5/2-, ν5/2[752] state
   137.45 6  (5/2)- 0.66 ns 4       
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 7 - Kπ=3/2-, ν3/2[761] state
   565.64 8  3/2-        

Back to top

Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
    41.25 7/2+       41.3M1(+E2) 3.5×102α=3.5×102 31, α(L)=2.6×10+2 23, α(M)=7.E1 6, α(N)=18 16, α(O)=3.9 35, α(P)=0.6 5, α(Q)=0.0041 21
   107.05 5/2+       65.8 1 M1+E20.11 +5-1011.2α=11.2 8, α(L)=8.5 6, α(M)=2.05 16, α(N)=0.54 4, α(O)=0.123 9, α(P)=0.0211 12, α(Q)=0.001556 28
5/2+      107.1 1 M1+E20.76 +20-1810.7α=10.7 7, α(K)=6.6 11, α(L)=3.1 4, α(M)=0.80 11, α(N)=0.211 28, α(O)=0.046 6, α(P)=0.0072 7, α(Q)=0.00026 4
   137.45 (5/2)- 0.66 ns 4      96.2 1 E1 0.1223B(E1)(W.u.)=2.37E-5 +27-23, α=0.1223 17, α(L)=0.0927 13, α(M)=0.02237 32, α(N)=0.00581 8, α(O)=0.001264 18, α(P)=0.0001971 28, α(Q)=9.69E-6 14
(5/2)- 0.66 ns 4     137.5 1 E1 0.2224B(E1)(W.u.)=7.9E-5 5, α=0.2224 31, α(K)=0.1746 25, α(L)=0.0363 5, α(M)=0.00871 12, α(N)=0.002270 32, α(O)=0.000499 7, α(P)=7.99E-5 11, α(Q)=4.35E-6 6
   142.67 1/2+ 17.23 ns 12      35.6(E2) 1373B(E2)(W.u.)=1.68 +32-38, α=1373 19, α(L)=1011 14, α(M)=273 4, α(N)=71.8 10, α(O)=15.21 21, α(P)=2.174 30, α(Q)=0.00403 6
1/2+ 17.23 ns 12     142.7 1 E2 2.141B(E2)(W.u.)=1.41 +16-13, α=2.141 31, α(K)=0.279 4, α(L)=1.369 20, α(M)=0.372 5, α(N)=0.0982 14, α(O)=0.02095 30, α(P)=0.00306 4, α(Q)=1.832E-5 26
   168.74 (3/2)+ 106 ps 18      26.1[M1] 159.8B(M1)(W.u.)=0.057 +12-9, α=159.8 22, α(L)=121.0 17, α(M)=29.1 4, α(N)=7.67 11, α(O)=1.750 24, α(P)=0.305 4, α(Q)=0.02403 34
(3/2)+ 106 ps 18      61.8 1 M1+E20.24 +6-817.0B(E2)(W.u.)=25 +16-14, B(M1)(W.u.)=0.0054 +16-11, α=17.0 24, α(L)=12.8 18, α(M)=3.2 5, α(N)=0.84 13, α(O)=0.187 27, α(P)=0.031 4, α(Q)=0.00180 5
(3/2)+ 106 ps 18     168.8 1 M1(+E2)0.3 LT3.43B(E2)(W.u.)<1.3, B(M1)(W.u.)=9E-4 +5-3, α=3.43 11, α(K)=2.73 11, α(L)=0.530 9, α(M)=0.1276 27, α(N)=0.0337 7, α(O)=0.00765 15, α(P)=0.001323 20, α(Q)=9.9E-5 4
   212.91 (3/2)+ 18 ps 14      44.3 2 M1+E20.95 +47-322.4×102α=2.4×102 9, α(L)=1.8×10+2 6, α(M)=48 17, α(N)=13 4, α(O)=2.7 9, α(P)=0.39 13, α(Q)=0.0034 7
(3/2)+ 18 ps 14      70.3 2 [M1] 8.66B(M1)(W.u.)=0.007 +11-4, α=8.66 14, α(L)=6.56 11, α(M)=1.570 26, α(N)=0.414 7, α(O)=0.0945 15, α(P)=0.01648 27, α(Q)=0.001295 21
(3/2)+ 18 ps 14      75.1 1 [E1] 0.2363B(E1)(W.u.)=6E-5 +9-3, α=0.2363 34, α(L)=0.1789 26, α(M)=0.0434 6, α(N)=0.01123 16, α(O)=0.002423 35, α(P)=0.000369 5, α(Q)=1.678E-5 24
(3/2)+ 18 ps 14     105.9 1 [M1] 13.14B(M1)(W.u.)=0.007 +10-3, α=13.14 19, α(K)=10.50 15, α(L)=1.997 28, α(M)=0.478 7, α(N)=0.1260 18, α(O)=0.0287 4, α(P)=0.00501 7, α(Q)=0.000393 6
(3/2)+ 18 ps 14     212.9 1 M1+E20.65 241.43B(E2)(W.u.)=12 +19-8, B(M1)(W.u.)=0.004 +6-2, α=1.43 21, α(K)=1.08 20, α(L)=0.263 6, α(M)=0.0649 9, α(N)=0.01713 24, α(O)=0.00384 7, α(P)=0.000641 23, α(Q)=4.0E-5 7
   478.86 (1/2)- ≤ 30 ps    266.0 1 E1 0.0462B(E1)(W.u.)>2.0E-5, α=0.0462 6, α(K)=0.0372 5, α(L)=0.00690 10, α(M)=0.001645 23, α(N)=0.000430 6, α(O)=9.60E-5 13, α(P)=1.593E-5 22, α(Q)=1.008E-6 14
(1/2)- ≤ 30 ps    310.1 1 E1 0.0327B(E1)(W.u.)>9.5E-5, α=0.0327 5, α(K)=0.0263 4, α(L)=0.00479 7, α(M)=0.001141 16, α(N)=0.000299 4, α(O)=6.68E-5 9, α(P)=1.116E-5 16, α(Q)=7.27E-7 10
(1/2)- ≤ 30 ps    336.2 1 E1 0.0273B(E1)(W.u.)>5.0E-5, α=0.0273 4, α(K)=0.02206 31, α(L)=0.00397 6, α(M)=0.000945 13, α(N)=0.0002473 35, α(O)=5.54E-5 8, α(P)=9.29E-6 13, α(Q)=6.14E-7 9
(1/2)- ≤ 30 ps    341.4 1 (E2) 0.1041B(E2)(W.u.)>0.3, α=0.1041 15, α(K)=0.0542 8, α(L)=0.0369 5, α(M)=0.00973 14, α(N)=0.00257 4, α(O)=0.000558 8, α(P)=8.58E-5 12, α(Q)=2.104E-6 29
   501.37 (5/2+)      358.7 1 (E2) 0.0906α=0.0906 13, α(K)=0.0490 7, α(L)=0.0308 4, α(M)=0.00810 11, α(N)=0.002140 30, α(O)=0.000465 7, α(P)=7.18×10-5 10, α(Q)=1.885E-6 26
   518.18 (3/2)-      349.5 1 E1 0.02506α=0.02506 35, α(K)=0.02028 28, α(L)=0.00363 5, α(M)=0.000864 12, α(N)=0.0002261 32, α(O)=5.07×10-5 7, α(P)=8.51E-6 12, α(Q)=5.66E-7 8
   541.46 (3/2-)      372.8 2 (E1) 0.02178α=0.02178 31, α(K)=0.01765 25, α(L)=0.00314 4, α(M)=0.000746 10, α(N)=0.0001952 27, α(O)=4.38×10-5 6, α(P)=7.37E-6 10, α(Q)=4.96E-7 7
(3/2-)      404.1 1 (M1) 0.315α=0.315 4, α(K)=0.254 4, α(L)=0.0462 6, α(M)=0.01103 15, α(N)=0.00291 4, α(O)=0.000663 9, α(P)=0.0001157 16, α(Q)=9.07×10-6 13
   550.85 (3/2)-      413.6 2 M1(+E2)0.8 LE0.25α=0.25 5, α(K)=0.20 4, α(L)=0.039 5, α(M)=0.0093 11, α(N)=0.00245 28, α(O)=0.00056 7, α(P)=9.6×10-5 13, α(Q)=7.1E-6 14
   565.64 3/2-      428.1 1 M1+E20.42 340.24α=0.24 5, α(K)=0.19 4, α(L)=0.036 5, α(M)=0.0087 11, α(N)=0.00228 29, α(O)=0.00052 7, α(P)=9.0×10-5 13, α(Q)=6.8E-6 14
E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
   752.91 (3/2)-      274.1 1 M1(+E2)0.4 40.81α=0.81 18, α(K)=0.64 16, α(L)=0.128 13, α(M)=0.0308 24, α(N)=0.0081 6, α(O)=0.00184 16, α(P)=0.00032 4, α(Q)=2.3×10-5 6

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.05/2+ 4.0 m 2 
% β- = 100
Q=+3.094 160 (2018Ly01), μ=+0.5017 11 (2018Ly01)
δ<r2>(214Ra,229Ra)=+1.8102 fm2 2 (stat) 908 (syst) (2018Ly01). Other: +1.556 fm2 158 (1988Ah02).
E(level): Kπ=5/2+, ν5/2[633] band.
    41.257/2+   E(level): Kπ=5/2+, ν5/2[633] band.
   107.055/2+   E(level): Kπ=5/2+, ν5/2[622] state.
   137.45(5/2)- 0.66 ns 4  E(level): Kπ=5/2-, ν5/2[752] state.
   142.671/2+ 17.23 ns 12  E(level): Kπ=1/2+, ν1/2[631] band.
   168.74(3/2)+ 106 ps 18  E(level): Kπ=1/2+, ν1/2[631] band.
   212.91(3/2)+ 18 ps 14  E(level): Kπ=3/2+, ν3/2[631] and ν3/2[642] state.
   478.86(1/2)- ≤ 30 ps E(level): Kπ=1/2-, ν1/2[501] band.
   518.18(3/2)-   E(level): Kπ=1/2-, ν1/2[501] band.
   565.643/2-   E(level): Kπ=3/2-, ν3/2[761] state.

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
   107.05    65.8M(γ): From α(L1)exp + α(L2)exp=6.6 9, α(L3)exp|<0.26, α(M)exp=2.05 14 in 1999Fr33
   107.1M(γ): From α(L1)exp + α(L2)exp=1.53 22, α(L3)exp|<0.25, α(M)exp=0.77 11, α(n)exp=0.28 9 in 1999Fr33
   137.45    96.2M(γ): From α(L1)exp + α(L2)exp|<0.31 in 1999Fr33
   137.5M(γ): From α(K)exp|<0.94, α(L1)exp + α(L2)exp= 0.017~7, α(L3)exp|<0.041 in 1999Fr33
   142.67    35.6M(γ): From α(exp)|>516, deduced from decay scheme transition intensity balance in 1999Fr33
   142.7M(γ): From α(K)exp|<0.48, α(L1)exp + α(L2)exp = 0.72 9, α(L3)exp= 0.35 4, α(M)exp=0.26 3, α(n)exp=0.080 10 in 1999Fr33
   168.74    61.8M(γ): From α(L1)exp + α(L2)exp= 5.2 8, α(M)exp=3.2 5 in 1999Fr33
   168.8M(γ): From α(K)exp=3.1 4, α(L1)exp + α(L2)exp= 0.32 5, α(L3)exp=0.015 8, α(M)exp= 0.07 4 in 1999Fr33
   478.86   266.0M(γ): From α(K)exp=0.046 10 in 1999Fr33
   310.1M(γ): From α(K)exp=0.020 3, α(L1)exp + α(L2)exp=0.0058 13 in 1999Fr33
   336.2M(γ): From α(K)exp=0.0172 22, α(L1)exp + α(L2)exp = 0.0039 16 in 1999Fr33
   341.4M(γ): From α(K)exp= 0.10 7 in 1999Fr33
   501.37   358.7M(γ): From α(K)exp=0.051 23 in 1999Fr33
   518.18   349.5M(γ): From α(K)exp=0.024 4 in 1999Fr33
   541.46   404.1M(γ): From α(K)exp=0.29 15 in 1999Fr33
   550.85   413.6M(γ): From α(K)exp=0.23 7 in 1999Fr33

Back to top