ADOPTED LEVELS, GAMMAS for 155Tm

Author: N. Nica |  Citation: Nucl. Data Sheets 160, 1 (2019) |  Cutoff date: 21-Oct-2019 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-6123 keV 19S(n)= 10270 keV 17S(p)= 1310 keV 11Q(α)= 4572 keV 5
S(2n)= 18795 keV 17S(2p)= 6192 keV 11Q(EC)= 5583 keV 12Q(ECp)= 724 keV 13
Reference: 2017WA10

References:
  A  155Yb ε decay  B  159Lu α decay
  C  142Nd(19F,6nγ)  D  144Sm(14N,3nγ)
  E  144Sm(16O,p4nγ) 

General Comments:

Most of the data are from the three heavy ion fusion-evaporation reactions datasets, 142Nd(19F,6nγ) (2006Li63), 144Sm(14N,3nγ) (2007Ra21), and 144Sm(16O,p4nγ) (2018Li19) studied by three independent groups the results of which are rather discrepant. The common part of all three datasets is the cascade of five E2 transitions in between 11/2- g.s. and 31/2- excited level plus two (M1+E2) transitions connecting this series with 25/2- level. Although 2018Li19 quote both previous studies they gave the smallest level scheme that did not solve the discrepancies in between the older studies (which did not quote each other). In between these older studies although there is a number of common transitons their placement is generally quite different. Because of this situation the evaluator opted to adopt the data from the most recent study 2018Li19 which constitutes the most secure part and the best overlap of all studies, together with transitions that are common to the earlier studies with the placement of 2007Ra21 (which is better documented). The particular datasets can be used for intercomparison

Levels: J(a) From considerations of total ε+β+ intensity, based on the intensity of the Kα1| x ray, and the large intensities of the γ’s deexciting these levels, 1991To08 conclude that the ε+β+ transitions feeding them are most likely allowed. Since Jπ(155Yb)=7/2- and these levels have transitions to the g.s., their Jπ values are probably 7/2- or 9/2-.










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABCD  11/2- 21.6 s 2 
% ε = 99.17 17
% α = 0.83 17
     
    41 6  B    1/2+ 45 s 4 
% ε > 98
% α < 2
     
   174.90 10 A     (7/2-,9/2-)      174.9 1 
  100

     0.0
11/2-
   236.20 10 A     (7/2-,9/2-)      236.2 1 
  100

     0.0
11/2-
   361.60 10 A     (7/2-,9/2-)      125.4 3 
   361.6 1 
   13 4 
  100 11 


   236.20
     0.0
(7/2-,9/2-)
11/2-
   380.00 23 A          205.1 2 
  100

   174.90
(7/2-,9/2-)
   535.6 3   CDE 15/2-      535.6 3 
  100
E2
     0.0
11/2-
   614.20 23 A          378.0 2 
  100

   236.20
(7/2-,9/2-)
  1132.0 5   CDE 19/2-      596.4 3 
  100
E2
   535.6
15/2-
  1380.3 5     E (17/2-)      844.6 5 
  100
(M1+E2)
   535.6
15/2-
  1751.7 5   CDE 23/2-      619.9 3 
  100
E2
  1132.0
19/2-
  2039.1 5    DE (21/2-)      287.9 5 
   658.7 5 
   906.8 5 
   83 4 
  100 10 
   39 3 

E2
(M1+E2)
  1751.7
  1380.3
  1132.0
23/2-
(17/2-)
19/2-
  2133.4 7   CDE (25/2-)      381.7 5 
  100
(M1+E2)
  1751.7
23/2-
  2311.8 6   CDE 27/2-      178.4 5 
   560.1 3 
   44 1 
  100 3 
(M1,E2)
E2
  2133.4
  1751.7
(25/2-)
23/2-
  2376.8 7    D  (23/2-)      337.7 5 
  100
(E2+M1)
  2039.1
(21/2-)
  2718.6 6     E (25/2-)      679.7 5 
   966.6 5 
  100 9 
   26 2 
E2
D(+Q)
  2039.1
  1751.7
(21/2-)
23/2-
  2767.1 8    D  31/2-      455.5 5 
  100

  2311.8
27/2-
  3030.8 8     E 31/2-      718.7 5 
  100
E2
  2311.8
27/2-
  3609.2 8    D  35/2-      842.3 5 
  100
E2
  2767.1
31/2-
  3769.4 8     E 35/2-      160.5 5 
   738.4 5 
  100 13 
   85 30 

E2
  3609.2
  3030.8
35/2-
31/2-
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  4244.9 10    D  (39/2-)      635.7 5 
  100
(E2)
  3609.2
35/2-
  4530.0 10     E 39/2-      760.6 5 
  100
E2
  3769.4
35/2-
  4647.0 11    D  (43/2-)      402.1 5 
  100
(E2)
  4244.9
(39/2-)
  4993.0 12    D  (47/2-)      346.0 5 
  100

  4647.0
(43/2-)
  5248.2 11     E 43/2-      718.2 5 
  100
E2
  4530.0
39/2-
  6074.2 12     E (47/2-)      826.0 5 
  100

  5248.2
43/2-
  6220.1 13    D  (51/2-)     1227.1 5 
  100

  4993.0
(47/2-)

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

Jπ(level): There is no superposition in between the data from 155Yb ε decay and 144Sm(16O,p4nγ) datasets (except for the g.s.). While for the 155Yb ε decay the arguments for Jπ are noted separately, for the most extensive part coming from the 144Sm(16O,p4nγ) dataset the assignments are strictly based on Angular Distribution from Oriented states (ADO) measurements where the ΔJ=2 transitions were assigned E2 (M2 is unlikely), and the ΔJ=1 transitions were assigned d(+Q) for the more pure ones and (M1+E2) for mixed D+Q (E1+M2 is less likely). Also into the assignments are included implicitly level scheme arguments, theory calculations, and systematics. The assignments done by 2018Li19 are confirmed by the evaluator

E(γ): There is no overlap in between γ-ray data from 155Yb ε decay (decaying excited levels |<614 except 536) and from heavy ion reactions (536 and all levels above 614). Unless mentioned otherwise γ-ray data from heavy ion reactions datasets are from 144Sm(16O,p4nγ) dataset (2018Li19), except for γ-ray intensity data adopted from 144Sm(14N,3nγ) dataset (2007Ra21, generally more precise)

M(γ): From ADO ratio measurements in 144Sm(16O,p4nγ) dataset unless mentioned otherwise. Pure Q were adopted as E2, while D+Q were adopted as (M1+E2) (see dataset for details)

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Based on πh11/2, α=-1/2
     0.0 11/2- 21.6 s 2 
% ε = 99.17 17
% α = 0.83 17
     
   535.6 3  15/2-        
  1132.0 5  19/2-      596.4 3 
  100
E2
   535.6
15/2-
  1751.7 5  23/2-      619.9 3 
  100
E2
  1132.0
19/2-
  2311.8 6  27/2-      178.4 5 
   560.1 3 
   44 1 
  100 3 
(M1,E2)
E2
  2133.4
  1751.7
(25/2-)
23/2-
  3030.8 8  31/2-      718.7 5 
  100
E2
  2311.8
27/2-
  3769.4 8  35/2-      160.5 5 
   738.4 5 
  100 13 
   85 30 

E2
  3609.2
  3030.8
35/2-
31/2-
  4530.0 10  39/2-      760.6 5 
  100
E2
  3769.4
35/2-
  5248.2 11  43/2-      718.2 5 
  100
E2
  4530.0
39/2-
  6074.2 12  (47/2-)      826.0 5 
  100

  5248.2
43/2-
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Based on πh11/2, α=+1/2
  1380.3 5  (17/2-)        
  2039.1 5  (21/2-)        
  2718.6 6  (25/2-)      679.7 5 
   966.6 5 
  100 9 
   26 2 
E2
D(+Q)
  2039.1
  1751.7
(21/2-)
23/2-
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Cascade based on 27/2-. Series of six ΔJ=2 transitions from
  2767.1 8  31/2-        
  3609.2 8  35/2-        
  4244.9 10  (39/2-)      635.7 5 
  100
(E2)
  3609.2
35/2-
  4647.0 11  (43/2-)      402.1 5 
  100
(E2)
  4244.9
(39/2-)
  4993.0 12  (47/2-)      346.0 5 
  100

  4647.0
(43/2-)
  6220.1 13  (51/2-)     1227.1 5 
  100

  4993.0
(47/2-)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   535.6 15/2-      535.6 3 E20.01439α=0.01439, α(K)=0.01148 17, α(L)=0.00226 4, α(M)=0.000517 8, α(N)=0.0001198 17, α(O)=1.616×10-5 23, α(P)=6.36E-7 9
  1132.0 19/2-      596.4 3 E20.01106α=0.01106, α(K)=0.00892 13, α(L)=0.001663 24, α(M)=0.000379 6, α(N)=8.79×10-5 13, α(O)=1.196E-5 17, α(P)=4.98E-7 7
  1380.3 (17/2-)      844.6 5 (M1+E2)0.0075α=0.0075 26, α(K)=0.0063 22, α(L)=9.5×10-4 28, α(M)=2.11E-4 60, α(N)=4.9E-5 14, α(O)=7.0E-6 21, α(P)=3.7E-7 14
  1751.7 23/2-      619.9 3 E20.01009α=0.01009, α(K)=0.00816 12, α(L)=0.001495 21, α(M)=0.000340 5, α(N)=7.89×10-5 11, α(O)=1.077E-5 16, α(P)=4.56E-7 7
  2039.1 (21/2-)      658.7 5 E20.00875α=0.00875, α(K)=0.00712 10, α(L)=0.001269 18, α(M)=0.000288 4, α(N)=6.68×10-5 10, α(O)=9.17E-6 13, α(P)=3.99E-7 6
(21/2-)      906.8 5 (M1+E2)0.0064α=0.0064 21, α(K)=0.0054 18, α(L)=8.0×10-4 23, α(M)=1.77E-4 49, α(N)=4.1E-5 12, α(O)=5.9E-6 18, α(P)=3.1E-7 11
  2133.4 (25/2-)      381.7 5 (M1+E2)0.056α=0.056 21, α(K)=0.046 19, α(L)=0.0080 15, α(M)=0.0018 3, α(N)=0.00042 7, α(O)=5.8×10-5 13, α(P)=2.7E-6 13
  2311.8 27/2-      178.4 5 (M1,E2)0.49α=0.49 11, α(K)=0.37 14, α(L)=0.097 22, α(M)=0.0228 60, α(N)=0.0053 13, α(O)=0.00068 12, α(P)=2.1×10-5 11
27/2-      560.1 3 E20.01289α=0.01289, α(K)=0.01033 15, α(L)=0.00198 3, α(M)=0.000454 7, α(N)=0.0001051 15, α(O)=1.423×10-5 20, α(P)=5.74E-7 8
  2376.8 (23/2-)      337.7 5 (E2+M1)0.078α=0.078 28, α(K)=0.063 26, α(L)=0.0116 16, α(M)=0.0026 3, α(N)=0.00061 8, α(O)=8.4×10-5 15, α(P)=3.7E-6 18
  2718.6 (25/2-)      679.7 5 E20.00814α=0.00814, α(K)=0.00664 10, α(L)=0.001168 17, α(M)=0.000265 4, α(N)=6.15×10-5 9, α(O)=8.45E-6 12, α(P)=3.73E-7 6
  3030.8 31/2-      718.7 5 E20.00717α=0.00717, α(K)=0.00587 9, α(L)=0.001010 15, α(M)=0.000228 4, α(N)=5.31×10-5 8, α(O)=7.33E-6 11, α(P)=3.30E-7 5
  3609.2 35/2-      842.3 5 E20.00506α=0.00506, α(K)=0.00418 6, α(L)=0.000682 10, α(M)=0.0001532 22, α(N)=3.57×10-5 5, α(O)=4.98E-6 7, α(P)=2.36E-7 4
  3769.4 35/2-      738.4 5 E20.00675α=0.00675, α(K)=0.00553 8, α(L)=0.000943 14, α(M)=0.000213 3, α(N)=4.95×10-5 7, α(O)=6.85E-6 10, α(P)=3.12E-7 5
  4244.9 (39/2-)      635.7 5 (E2)0.00951α=0.00951, α(K)=0.00771 11, α(L)=0.001396 20, α(M)=0.000317 5, α(N)=7.36×10-5 11, α(O)=1.007E-5 15, α(P)=4.32E-7 6
  4530.0 39/2-      760.6 5 E20.00632α=0.00632, α(K)=0.00519 8, α(L)=0.000875 13, α(M)=0.000197 3, α(N)=4.59×10-5 7, α(O)=6.37E-6 9, α(P)=2.93E-7 5
  4647.0 (43/2-)      402.1 5 (E2)0.0306α=0.0306, α(K)=0.0235 4, α(L)=0.00550 8, α(M)=0.001277 19, α(N)=0.000295 5, α(O)=3.86×10-5 6, α(P)=1.262E-6 18
  5248.2 43/2-      718.2 5 E20.00718α=0.00718, α(K)=0.00588 9, α(L)=0.001012 15, α(M)=0.000229 4, α(N)=5.32×10-5 8, α(O)=7.35E-6 11, α(P)=3.31E-7 5

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.011/2- 21.6 s 2 
% ε = 99.17 17
% α = 0.83 17
E(level): Based on πh11/2, α=-1/2.
    411/2+ 45 s 4 
% ε > 98
% α < 2
XREF: B(41).
   535.615/2-   E(level): Based on πh11/2, α=-1/2.
  1132.019/2-   E(level): Based on πh11/2, α=-1/2.
  1380.3(17/2-)   E(level): Based on πh11/2, α=+1/2.
  1751.723/2-   E(level): Based on πh11/2, α=-1/2.
  2039.1(21/2-)   The presumably same (21/2-) level is deexcited in both 144Sm(14N,3nγ) (2007Ra21) and 144Sm(16O,p4nγ) (2018Li19) datasets by presumably the same (M1+E2) γ ray while the second γ ray is different in the two datasets. The feeding-in of this level also differs in the two dataset whence the possibility to have two different (21/2-) close-lying levels.
E(level): Based on πh11/2, α=+1/2.
  2311.827/2-   E(level): Based on πh11/2, α=-1/2.
  2718.6(25/2-)   E(level): Based on πh11/2, α=+1/2.
  2767.131/2-   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.
  3030.831/2-   E(level): Based on πh11/2, α=-1/2.
  3609.235/2-   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.
  3769.435/2-   E(level): Based on πh11/2, α=-1/2.
  4244.9(39/2-)   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.
  4530.039/2-   E(level): Based on πh11/2, α=-1/2.
  4647.0(43/2-)   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.
  4993.0(47/2-)   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.
  5248.243/2-   E(level): Based on πh11/2, α=-1/2.
  6074.2(47/2-)   E(level): Based on πh11/2, α=-1/2.
  6220.1(51/2-)   E(level): Cascade based on 27/2-. Series of six ΔJ=2 transitions from.

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Additional Gamma Comments:

E(level)E(gamma)Comments
  2039.1   287.9E(γ): from 144Sm(14N,3nγ) (2007Ra21)
   658.7I(γ): from 144Sm(16O,p4nγ) (2018Li19)
   906.8I(γ): from 144Sm(16O,p4nγ) (2018Li19)
  2133.4   381.7M(γ): 144Sm(14N,3nγ) (2007Ra21) found ΔJ=0, d or ΔJ=2, Q from DCO ratio measurements
  2311.8   178.4M(γ): 144Sm(14N,3nγ) (2007Ra21) found ΔJ=0, d or ΔJ=2, Q from DCO ratio measurements
  2718.6   679.7I(γ): from 144Sm(16O,p4nγ) (2018Li19)
   966.6I(γ): from 144Sm(16O,p4nγ) (2018Li19)
  3769.4   738.4I(γ): from 144Sm(14N,3nγ) (2007Ra21); 144Sm(16O,p4nγ) (2018Li19) gives 100

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