ADOPTED LEVELS, GAMMAS for 154Tm

Author: N. Nica |  Citation: Nucl. Data Sheets 200, 2 (2025) |  Cutoff date: 22-Aug-2022 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-4495 keV 14S(n)= 8526 keV 19S(p)= 1249 keV 17Q(α)= 5093.8 keV 26
Reference: 2021WA16

References:
  A  154Yb ε decay  B  158Lu α decay
  C  144Sm(14N,4nγ) 

General Comments:

Data are primarily from 144Sm(14N,4nγ), with minor additions from 154Yb ε decay, 154Tm α decay (8.1 s), and 154Tm α decay (3.30 s).

Q-value: S(2n)=18850 60, S(2p)=5400 19, Q(εp)=3296 15 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0ABC (2-) 8.1 s 3 
% ε = 46 5
% α = 54 5
     
   133.2 2 A   1+      133.2 2 
  100
E1
     0
(2-)
   0+X  C 9+ 3.30 s 7 
% IT = ?
% ε = 42 5
% α = 58 5
     
   266.10+X 17   C (10+)      266.1 2 
  100

   0+X
9+
   745.12+X 9   C 11+      745.1 1 
  100
E2
   0+X
9+
   751.79+X 10   C 11+      751.8 1 
  100
E2
   0+X
9+
  1035.09+X 16   C (12+)      290.0 2 
   769.0 3 
   65
  100


   745.12+X
   266.10+X
11+
(10+)
  1134.98+X 13   C 13+      383.2 1 
  100
E2
   751.79+X
11+
  1323.34+X 13   C 13+      578.2 1 
  100
E2
   745.12+X
11+
  1674.06+X 14   C 14+      350.7 1 
   639.0 2 
  100
  <98
M1+E2

  1323.34+X
  1035.09+X
13+
(12+)
  1814.81+X 19   C 15+      140.6 3 
   679.6 3 
 
  100

E2
  1674.06+X
  1134.98+X
14+
13+
  2145.25+X 16   C 16+      471.2 1 
  100
E2
  1674.06+X
14+
  2424.55+X 17   C 15+      279.3 1 
   609.6 3 ?
  1289.9 3 
  100
   10
   25
M1+E2


  2145.25+X
  1814.81+X
  1134.98+X
16+
15+
13+
  2453.99+X 25   C 16+      639.2 2 
  100
M1+E2
  1814.81+X
15+
  2514.42+X 18   C 16+       89.9 1 
   699.2 3 
  100
   21
M1+E2

  2424.55+X
  1814.81+X
15+
15+
  2616.74+X 20   C 17+      102.3 1 
   802.0 3 
  100
   62
M1+E2

  2514.42+X
  1814.81+X
16+
15+
  2742.65+X 22   C 19+      125.9 1 
  100
E2
  2616.74+X
17+
  2750.37+X 26   C 17+      296.4 2 
   935.6 3 
   80
  100
M1+E2
E2
  2453.99+X
  1814.81+X
16+
15+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2881.58+X 27   C      138.9 2 
  100

  2742.65+X
19+
  3240.45+X 31   C      358.9 2 
  100

  2881.58+X

  3409.96+X 30   C 19+      659.6 2 
  100
[E2]
  2750.37+X
17+
  3420.87+X 29   C 20+      678.1 3 
  100
M1+E2
  2742.65+X
19+
  3471.61+X 34   C 19+      721.3 3 
  100
E2
  2750.37+X
17+
  3740.45+X 30   C 20+      268.9 3 
   330.5 2 
  100
   88
M1+E2
M1+E2
  3471.61+X
  3409.96+X
19+
19+
  4056.99+X 29   C 22+      636.2 2 
  1175.3 3 
  100
   60
E2

  3420.87+X
  2881.58+X
20+

  4090.77+X 29   C      669.6 3 
  1348.2 3 
   22
  100


  3420.87+X
  2742.65+X
20+
19+
  4486.26+X 30   C 23+      395.4 2 
   429.3 2 
   61
  100

M1+E2
  4090.77+X
  4056.99+X

22+
  4498.11+X 30   C 21+      757.7 2 
  1257.7 3 
  100
   62
M1+E2

  3740.45+X
  3240.45+X
20+

  4667.9+X 4   C      577.1 3 
  100

  4090.77+X

  4865.7+X 5   C      197.8 2 
  100

  4667.9+X

  4996.80+X 30   C 23+      498.7 1 
   510.4 3 
  100
   64
E2

  4498.11+X
  4486.26+X
21+
23+
  5208.80+X 32   C 25+      212.0 1 
  100
E2
  4996.80+X
23+
  5974.3+X 4   C      765.5 2 
  100

  5208.80+X
25+
  6141.2+X 4   C      166.9 1 
  100
E1
  5974.3+X

E(level): For the levels above the 9+ level, the values are from a least-squares fit to the γ energies as given in the heavy-ion data set.

M(γ): From conversion-electron data in 144Sm(14N,4nγ) dataset (2002Fo07) unless otherwise mentioned

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - γ cascade based on 9+ level
   0+X 9+ 3.30 s 7 
% IT = ?
% ε = 42 5
% α = 58 5 		     
   751.79+X 10  11+      751.8 1 
  100
E2
   0+X
9+
  1134.98+X 13  13+        
  1814.81+X 19  15+      140.6 3 
   679.6 3 
 
  100

E2
  1674.06+X
  1134.98+X
14+
13+
  2750.37+X 26  17+      296.4 2 
   935.6 3 
   80
  100
M1+E2
E2
  2453.99+X
  1814.81+X
16+
15+
  3471.61+X 34  19+      721.3 3 
  100
E2
  2750.37+X
17+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - γ cascade based on 21+ level
  4498.11+X 30  21+        
  4996.80+X 30  23+      498.7 1 
   510.4 3 
  100
   64
E2

  4498.11+X
  4486.26+X
21+
23+
  5208.80+X 32  25+        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - γ cascade based on (10+) level
   266.10+X 17  (10+)        
  1035.09+X 16  (12+)      290.0 2 
   769.0 3 
   65
  100


   745.12+X
   266.10+X
11+
(10+)
  1674.06+X 14  14+        
  2145.25+X 16  16+      471.2 1 
  100
E2
  1674.06+X
14+

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   133.2 1+      133.2 2 E10.1562α=0.1562

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0(2-) 8.1 s 3 
% ε = 46 5
% α = 54 5
Q=+0.4 9, μ=-1.14 2
From an evaluation of data on nuclear rms charge radii, 2014An02 report <r2>1/2=5.076~fm~17.
E(level): From an evaluation of data on nuclear rms charge radii, 2014An02 report <r2>1/2=5.076~fm~17.
   0+X9+ 3.30 s 7 
% IT = ?
% ε = 42 5
% α = 58 5
Q=-0.2 4, μ=+5.91 5
Δ<r2>(169Tm-154Tm(J=9))=1.522 fm2 15 (2000Ba16).
E(level): Δ<r2>(169Tm-154Tm(J=9))=1.522 fm2 15 (2000Ba16).
  2742.65+X19+   Possible isomer from 2002Fo07 in 144Sm(14N,4nγ) dataset.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   133.2   133.2M(γ): From conversion-electron data in 154Yb ε decay (1988Vi02)
  1674.06+X   639.0I(γ): See the comment on this value in the heavy-ion data set.
  2453.99+X   639.2I(γ): See the comment on this value in the heavy-ion data set.
  3409.96+X   659.6M(γ): M1+E2 based on α(K)exp contradicts ΔJ=2 transition from level scheme

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