ADOPTED LEVELS, GAMMAS for 216Th

Author: C. Morse |  Citation: Nucl. Data Sheets 209, 409 (2026) |  Cutoff date: 5-Aug-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-7.53×103 keV 3S(n)= 8694 keV 13S(p)= 3021 keV 17Q(α)= 8072 keV 4
Reference: 2021Wa16

References:
  A  216Th IT decay (135 μs)  B  216Th IT decay (0.74 μs)








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0A  0+ 26.3 ms 2 
% α = 100
     
  1478.21 10 A  (2+)     1478.2 1 
 
(E2)
     0.0
0+
  1687.71 15 A  (3-)      209.5 1 
 
E1
  1478.21
(2+)
  1813.81 18 A  (4+)      126.1 1 
   335.8 3 ?
  100 12 
    4.7 14 
E1
(E2)
  1687.71
  1478.21
(3-)
(2+)
  2013.71 20 A  (6+)      199.9 1 
 
E2
  1813.81
(4+)
  2039 7 AB (8+) 135 µs 4 
% α = 2.8 9
% IT = 97.2 9
    26S
 

  2013.71
(6+)
  2130 7  B (8+)       90.5S
 

  2039
(8+)
  2646 7  B (11-) 580 ns 26     516.3 2 
   606.8 1 
    8 2 
  100 4 
(E3)
(E3)
  2130
  2039
(8+)
(8+)
  3529 7  B (12+)      883.4 3 
 
(E1)
  2646
(11-)
  3680 7  B (14+) 0.74 µs 7 
% IT = 100
   151.2 6 
 
(E2)
  3529
(12+)

E(level): From a least-squares fit to Eγ, unless noted otherwise. The uncertainty of the levels from 2039-keV upwards is dominated by the uncertainty in the Qα values.

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
  1478.21 (2+)     1478.2 1 (E2)0.00487α=0.00487 7, α(K)=0.00382 5, α(L)=0.000751 11, α(M)=0.0001814 25, α(N)=4.83×10-5 7, α(O)=1.135E-5 16, α(P)=2.167E-6 30, α(Q)=1.848E-7 26
  1687.71 (3-)      209.5 1 E10.0846α=0.0846 12, α(K)=0.0671 9, α(L)=0.01329 19, α(M)=0.00320 4, α(N)=0.000845 12, α(O)=0.0001953 27, α(P)=3.59×10-5 5, α(Q)=2.55E-6 4
  1813.81 (4+)      126.1 1 E10.283α=0.283 4, α(K)=0.2190 31, α(L)=0.0484 7, α(M)=0.01171 17, α(N)=0.00308 4, α(O)=0.000705 10, α(P)=0.0001262 18, α(Q)=7.82×10-6 11
(4+)      335.8 3 (E2)0.1207α=0.1207 17, α(K)=0.0583 8, α(L)=0.0460 7, α(M)=0.01227 18, α(N)=0.00328 5, α(O)=0.000744 11, α(P)=0.0001290 19, α(Q)=3.52×10-6 5
  2013.71 (6+)      199.9 1 E20.660α=0.660 9, α(K)=0.1585 22, α(L)=0.367 5, α(M)=0.1002 14, α(N)=0.0268 4, α(O)=0.00602 9, α(P)=0.001017 14, α(Q)=1.226×10-5 17
  2646 (11-) 580 ns 26     516.3 2 (E3)0.1428B(E3)(W.u.)=5.2 13, α=0.1428 20, α(K)=0.0631 9, α(L)=0.0585 8, α(M)=0.01585 22, α(N)=0.00427 6, α(O)=0.000972 14, α(P)=0.0001708 24, α(Q)=5.44E-6 8
(11-) 580 ns 26     606.8 1 (E3)0.0876B(E3)(W.u.)=21.2 11, α=0.0876 12, α(K)=0.0454 6, α(L)=0.0310 4, α(M)=0.00831 12, α(N)=0.002235 31, α(O)=0.000511 7, α(P)=9.08E-5 13, α(Q)=3.51E-6 5
  3529 (12+)      883.4 3 (E1)0.00431α=0.00431 6, α(K)=0.00353 5, α(L)=0.000588 8, α(M)=0.0001391 19, α(N)=3.69×10-5 5, α(O)=8.68E-6 12, α(P)=1.668E-6 23, α(Q)=1.515E-7 21
  3680 (14+) 0.74 µs 7 
% IT = 100
   151.2 6 (E2)1.94B(E2)(W.u.)=0.0428 +47-39, α=1.94 4, α(K)=0.2396 35, α(L)=1.244 28, α(M)=0.341 8, α(N)=0.0914 21, α(O)=0.0204 5, α(P)=0.00342 8, α(Q)=2.63E-5 5

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  2039(8+) 135 µs 4 
% α = 2.8 9
% IT = 97.2 9
configuration=h9/2f7/2 (2005Ku31).
  2130(8+)   configuration=h9/22 (2005Ku31).
  2646(11-) 580 ns 26  configuration=h9/2i13/2 (2001Ha46).

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Additional Gamma Comments:

E(level)E(gamma)Comments
  1478.21  1478.2M(γ): Assumed based on systematics of 2+|)0+ transitions for n=126 isotones.
  1687.71   209.5M(γ): Based on intensity balance in 216Th IT Decay (135 μs)
  1813.81   126.1M(γ): Based on intensity balance in 216Th IT Decay (135 μs)
   335.8M(γ): Required by 126.1(E1)-209.5(E1) cascade.
  2013.71   199.9M(γ): Based on intensity balance in 216Th IT Decay (135 μs)
  2039    26E(γ): Not observed, energy from level-energy difference
  2130    90.5E(γ): Deduced from level energies, as this transition has not been observed.
  2646   516.3M(γ): From consistency with level scheme
   606.8M(γ): From consistency with level scheme
  3529   883.4M(γ): 2005Ku03 states that the transition (γ+e-) intensity balance is consistent with an E2(151.2γ)-E1(883.4γ) cascade in IT decay (0.74 μs).
  3680   151.2M(γ): 2005Ku03 states that the transition (γ+e-) intensity balance is consistent with an E2(151.2γ)-E1(883.4γ) cascade in IT decay (0.74 μs).

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