ADOPTED LEVELS, GAMMAS for 154Yb

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

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-10270 keV SYS(n)= 10840 keV SYS(p)= 3248 keV 21Q(α)= 5474.3 keV 17
Reference: 2021WA16

References:
  A  154Lu ε decay  B  158Hf α decay
  C  106Cd(54Fe,α2pγ) 

General Comments:

The information on 154Yb comes primarily from the study of the 154Lu ε decay (1988Vi02) and the in-beam studies (1993Zh10 and 1996Zh09). These latter studies make extensive use of multiparticle shell-model calculations to elucidate the properties of the 154Yb levels.

Levels: α-particle emission from excited levels between 3 and 6 MeV in 154Yb populated in the 154Lu ε decay has been reported by 1988Vi02. In addition, these authors report proton emission from 154Yb states between 6.5 and 9 MeV excitation energy. They measure Iα=0.03% and Ip=0.06%. These values were determined from the measured α and proton intensities, respectively, relative to Iγ(821.3)(1+α), which they assume represents 100% of the 154Lu decays.

Q-value: ΔQ(β-)=200, ΔS(n)=200 (syst,2021Wa16)

Q-value: S(2n)=19800 150, S(2p)=4010 19, Q(εp)=3246 20 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0ABC 0+ 0.409 s 2 
% ε = 7.4 12
% α = 92.6 12
     
   821.3 2 A C (2+)      821.3 2 
  100
[E2]
     0
0+
  1516.0 3 A C (4+)      694.7 2 
  100
[E2]
   821.3
(2+)
  1949.6 4 A C (6+)      433.6 2 
  100
[E2]
  1516.0
(4+)
  2046.2 4 A C (8+) 28 ns 2      96.6 2 
  100
E2
  1949.6
(6+)
  2914.7  C (10+)      868.5
  100

  2046.2
(8+)
  3228.5  C (11-)      313.8
  100

  2914.7
(10+)
  3696.4  C (12+)      781.7
  100

  2914.7
(10+)
  4318.8  C (14+)      622.4
  100

  3696.4
(12+)
  4479.1  C (16+) 18.6 ns 15     160.3
  100
(E2)
  4318.8
(14+)
  4608.2  C (16+)      129.1
  100

  4479.1
(16+)
  4996.1  C (17+)      517.0
  100

  4479.1
(16+)
  5178.0  C (18+)      181.8
   698.9
 
 
(M1)

  4996.1
  4479.1
(17+)
(16+)
  5370.1  C      374.0
  100

  4996.1
(17+)
  5382.8  C      903.7
  100

  4479.1
(16+)
  5517.5  C      339.5
  100

  5178.0
(18+)
  5537.2  C     1058.1
  100

  4479.1
(16+)
  5738.2  C      560.2
  100

  5178.0
(18+)
  5878.1  C      139.9
  100

  5738.2

  6178.2  C      300.1
  100

  5878.1

  6283.3  C (20+)      545.1
  100

  5738.2

  6342.9  C (20)      604.7
  100

  5738.2

  6666.3  C      323.4
   383.0
 
 


  6342.9
  6283.3
(20)
(20+)
  6796.5  C (21+)      513.2
  100

  6283.3
(20+)
  6984.5  C (22+)      188.0
   318.3
 
 


  6796.5
  6666.3
(21+)

E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  7187.2  C (22)      390.7
  100

  6796.5
(21+)
  7245.9  C      579.6
  100

  6666.3

  7439.6  C     1156.3
  100

  6283.3
(20+)
  7609.9  C (24)      625.4
  100

  6984.5
(22+)

E(level): Computed from the listed γ-ray energies.

Jπ(level): From systematics of the yrast levels in the n=84 nuclides and theoretical calculations in 106Cd(54Fe,α2pγ) dataset (1996Zh09, 1993Zh10). There are only three multipolarity values measured in this dataset, therefore the proposed Jπ values are highly tentative

E(γ): From 1993Zh10 in 106Cd(54Fe,α2pγ), unless noted otherwise.

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
  1949.6 (6+)      433.6 2 [E2]0.0259α=0.0259
  2046.2 (8+) 28 ns 2      96.6 2 E23.67B(E2)(W.u.)=10.5 +8-7, α=3.67
  4479.1 (16+) 18.6 ns 15     160.3(E2)0.571B(E2)(W.u.)=3.73 +34-29, α=0.571
  5178.0 (18+)      181.8(M1)0.620α=0.620

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     00+ 0.409 s 2 
% ε = 7.4 12
% α = 92.6 12
Δ<r2>(152Yb-154Yb)=0.357 fm2 67 and Δ<r2>(154Yb-156Yb)=0.274 fm2 60 (from tabulation in 1994Ma57 and based on data of 1989Sp04 which is only reported in plots); others: see graphs of 1989Sp04 and 1991Ho22. From an evaluation of data on nuclear rms charge radii, 2013An02 report <r2>1/2=5.088~fm~11.
E(level): Δ<r2>(152Yb-154Yb)=0.357 fm2 67 and Δ<r2>(154Yb-156Yb)=0.274 fm2 60 (from tabulation in 1994Ma57 and based on data of 1989Sp04 which is only reported in plots); others: see graphs of 1989Sp04 and 1991Ho22. From an evaluation of data on nuclear rms charge radii, 2013An02 report <r2>1/2=5.088~fm~11.
Jπ(level): yrast sequence of positive-parity levels. Configuration=((πh11/26)(νf7/22)).
   821.3(2+)   Jπ(level): yrast sequence of positive-parity levels. Configuration=((πh11/26)(νf7/22)).
  1516.0(4+)   Jπ(level): yrast sequence of positive-parity levels. Configuration=((πh11/26)(νf7/22)).
  1949.6(6+)   Jπ(level): yrast sequence of positive-parity levels. Configuration=((πh11/26)(νf7/22)).
  2046.2(8+) 28 ns 2  Jπ(level): yrast sequence of positive-parity levels. Configuration=((πh11/26)(νh9/2)(νf7/2)).
  2914.7(10+)   Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νf7/22)).
  3696.4(12+)   Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νf7/22)).
  4318.8(14+)   Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νf7/22)).
  4479.1(16+) 18.6 ns 15  Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νh9/2)(νf7/2)).
  4608.2(16+)   Jπ(level): Configuration= ((πh11/24)0+(πh11/22)10+(νf7/22)).
  4996.1(17+)   Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νh9/2)(νf7/2)).
  5178.0(18+)   Jπ(level): yrast sequence of positive-parity levels. Configuration= ((πh11/24)0+(πh11/22)10+(νh9/2)(νf7/2)).
  6283.3(20+)   Jπ(level): yrast sequence of positive-parity levels.
  6796.5(21+)   Jπ(level): yrast sequence of positive-parity levels.
  6984.5(22+)   Jπ(level): yrast sequence of positive-parity levels.
  7609.9(24)   Jπ(level): yrast sequence of positive-parity levels.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   821.3   821.3E(γ): From 154Lu ε decay (1988Vi02).
  1516.0   694.7E(γ): From 154Lu ε decay (1988Vi02).
  1949.6   433.6E(γ): From 154Lu ε decay (1988Vi02).
  2046.2    96.6E(γ): From 154Lu ε decay (1988Vi02).
M(γ): From αK(exp)=1.3 3 in 154Lu ε decay (1988Vi02).
  4479.1   160.3M(γ): From intensity balance and level T1/2 in 106Cd(54Fe,α2pγ).
  5178.0   181.8M(γ): From 106Cd(54Fe,α2pγ).

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