ADOPTED LEVELS, GAMMAS for 206Ra

Author: F.G. Kondev |  Citation: Nucl. Data Sheets 201, 346 (2025) |  Cutoff date: 21-Jan-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-9920 keV 70S(n)= 10310 keV 29S(p)= 2414 keV 20Q(α)= 7415 keV 4
Reference: 2021WA16

References:
  A  210Th α decay  B  170Yb(40Ar,4nγ)








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0AB 0+ 0.24 s 2 
% α ≈ 100
     
   474.3 5  B (2+)     474.3 5 
  100
[E2]
     0
0+
  1052.1 7  B (4+)     577.8 5 
  100
[E2]
   474.3
(2+)
  1762.7 9  B (6+)     710.6 5 
  100
[E2]
  1052.1
(4+)
  2010.1 10  B (8+) < 1 ns   247.4 5 
  100
[E2]
  1762.7
(6+)

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

Jπ(level): From 170Yb(40Ar,4nγ) (1999Co13) based on the apparent band structure and systematics of heavier, even-even Ra nuclei

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   474.3 (2+)     474.3 5 [E2]0.0439α=0.0439 6, α(K)=0.0280 4, α(L)=0.01186 17, α(M)=0.00306 4, α(N)=0.000807 12, α(O)=0.0001770 26, α(P)=2.80×10-5 4, α(Q)=1.032E-6 15
  1052.1 (4+)     577.8 5 [E2]0.0277α=0.0277 4, α(K)=0.01909 27, α(L)=0.00645 9, α(M)=0.001639 23, α(N)=0.000432 6, α(O)=9.55×10-5 14, α(P)=1.540E-5 22, α(Q)=6.87E-7 10
  1762.7 (6+)     710.6 5 [E2]0.01776α=0.01776 25, α(K)=0.01295 18, α(L)=0.00361 5, α(M)=0.000903 13, α(N)=0.0002380 34, α(O)=5.29×10-5 7, α(P)=8.69E-6 12, α(Q)=4.55E-7 6
  2010.1 (8+) < 1 ns   247.4 5 [E2]0.280B(E2)(W.u.)>6.5, α=0.280 4, α(K)=0.1057 15, α(L)=0.1286 21, α(M)=0.0344 6, α(N)=0.00910 15, α(O)=0.001958 32, α(P)=0.000294 5, α(Q)=4.42E-6 7

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     00+ 0.24 s 2 
% α ≈ 100
Eα=7294 keV 23 (2021Ni08), 7262 keV 15 (1995Uu01), 7270 keV 10 (1987He10) and 7270 keV 5 (1967Va22). Others: 7268 keV 10 (1995Le15, 1996Le09) and 7263 keV 20 (1995Le41).
  2010.1(8+) < 1 ns Configuration=π(h9/2+2)8+ in 1999Co13. The assignment is tentative. Given the large B(E2) value for the 247.4γ a significant mixture with a collective Jπ=8+ state can be expected.

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