ADOPTED LEVELS, GAMMAS for 149Er

Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 185, 2 (2022) |  Cutoff date: 23-Aug-2022 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-9800 keV SYS(n)= 10334 keV 30S(p)= 3040 keV 90Q(α)= 2076 keV 29
Reference: 2021WA16

References:
  A  149Tm ε decay (0.9 S)  B  149Er IT decay (9.6 S)
  C  92Mo(60Ni,2pnγ) 

General Comments:

149Er produced and identified by 1982No07, 1984To07, 1987Br14 and 1989Fi01.

From gross theory of β decay (1973Ta30), for 153Yb %ε+%β+≈50, %α is expected to be ≈50. But no α decay of 4.2-s 153Yb has been reported (1978AfZZ,1989Ko02). Theoretical partial T1/2(153Yb α decay)=10×107.5 s (2019Mo01) predicts negligible %α

Theoretical studies: consult the NSR database at www.nndc.bnl.gov/nsr/ for three references for structure and one for radioactive decay listed under ’document records’ which can be accessed through web retrieval of the ENSDF database at www.nndc.bnl.gov/ensdf/

Q-value: ΔQ(β-)=200 (syst,2021Wa16)

Q-value: Q(ε)=7900 30, Q(εp)=6829 29, S(2n)=23280 50, S(2p)=4124 29 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABC (1/2+) 4 s 2 
% ε = 100
% εp = 7 2
     
   111.19 10 ABC (3/2+)      111.2 1 
   100
M1
     0.0
(1/2+)
   741.69 23 ABC (11/2-) 9.6 s 6 
% IT = 3.5 7
% ε = 96.5 7
% εp = 0.18 7
   630.5 2 
   100
M4
   111.19
(3/2+)
   907.37 18 A   (5/2+)      796.2 2 
   907.3 3 
  ≈100
   ≈48


   111.19
     0.0
(3/2+)
(1/2+)
  1066.17 21 A   (7/2-)      158.8 1 
   100
[E1]
   907.37
(5/2+)
  1482.9 4 A   (9/2-,11/2-)      416.7 3 
   100

  1066.17
(7/2-)
  2311.5 3   C (15/2-)     1569.8 2 
   100

   741.69
(11/2-)
  2478.8 3   C (15/2+)      167.3 1 
  1737.0 3 
   100 3 
     6 1 
E1

  2311.5
   741.69
(15/2-)
(11/2-)
  2542.1 3   C (15/2+)       63.3 2 
   230.6 1 
    41 2 
   100 3 
M1

  2478.8
  2311.5
(15/2+)
(15/2-)
  2611.0 3   C (19/2+) 0.61 µs 8      68.9 1 
   132.3 1 
    57 3 
   100 5 
E2
E2
  2542.1
  2478.8
(15/2+)
(15/2+)
  2611.1+X  C (21/2+)        
  2683.7+X?  C       72.4 4 ?
   100

  2611.1+X
(21/2+)
  2864.10+X 15 ?  C      179.9 2 ?
   253.0 3 ?
   100 6 
    45 6 


  2683.7+X
  2611.1+X

(21/2+)
  3187.80+X 10   C (23/2-)      323.7 1 
   576.7 1 
    11.1 5 
   100 3 


  2864.10+X
  2611.1+X

(21/2+)
  3242.9+X 4   C (27/2-) 4.8 µs 2      55.1 3 
   100
E2
  3187.80+X
(23/2-)

E(level): From a least-squares fit to γ-ray energies

Jπ(level): Low spins (|<11/2) are from 1987To12 in 149Tm ε decay and high spins (|>11/2) are from probable shell model configurations and analogy to 147Dy (1987Br14) in (60Ni,2pnγ)

T1/2(level): From γγ(t) in (60Ni,2pnγ) (1987Br14), unless otherwise noted.

M(γ): From ce data in (60Ni,2pnγ), unless otherwise noted.

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   111.19 (3/2+)      111.2 1 M12.100α=2.100 30
   741.69 (11/2-) 9.6 s 6 
% IT = 3.5 7
% ε = 96.5 7
% εp = 0.18 7
   630.5 2 M40.320B(M4)(W.u.)=1.67 +37-35, α=0.320 4
  1066.17 (7/2-)      158.8 1 [E1]0.0953α=0.0953 13
  2478.8 (15/2+)      167.3 1 E10.0830α=0.0830 12
  2542.1 (15/2+)       63.3 2 M110.62α=10.62 18
  2611.0 (19/2+) 0.61 µs 8      68.9 1 E212.77B(E2)(W.u.)=0.73 +11-9, α=12.77 19
(19/2+) 0.61 µs 8     132.3 1 E21.051B(E2)(W.u.)=0.049 +8-6, α=1.051 15
  3242.9+X (27/2-) 4.8 µs 2      55.1 3 E231.5B(E2)(W.u.)=0.152 9, α=31.5 10

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
  2311.5(15/2-)   Jπ(level): Member of configuration=πh11/24~#νh11/2-1 (1987Br14).
  2478.8(15/2+)   Jπ(level): Member of configuration=πh11/24~#νs1/2-1 and configuration=πh11/24~#νd3/2-1 (1987Br14).
  2542.1(15/2+)   Jπ(level): Member of configuration=πh11/24~#νs1/2-1 and configuration=πh11/24~#νd3/2-1 (1987Br14).
  2611.0(19/2+) 0.61 µs 8  Jπ(level): Member of configuration=πh11/24~#νs1/2-1 and configuration=πh11/24~#νd3/2-1 (1987Br14).
  2611.1+X(21/2+)   Jπ(level): Member of configuration=πh11/24~#νs1/2-1 and configuration=πh11/24~#νd3/2-1 (1987Br14).
  3187.80+X(23/2-)   Jπ(level): Member of configuration=πh11/24~#νh11/2-1 (1987Br14).
  3242.9+X(27/2-) 4.8 µs 2  Jπ(level): Member of configuration=πh11/24~#νh11/2-1 (1987Br14).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   111.19   111.2E(γ): weighted average of 111.3 1 (1987To02) from 149Tm ε decay, 111.0 1 (1985To11) and 111.3 3 (1989Fi01) from IT decay.
M(γ): From ce data in IT decay
   741.69   630.5E(γ): from IT decay
M(γ): From ce data in IT decay
   907.37   796.2E(γ): From 149Tm ε decay
I(γ): From 149Tm ε decay
   907.3E(γ): From 149Tm ε decay
I(γ): From 149Tm ε decay
  1066.17   158.8E(γ): From 149Tm ε decay
  1482.9   416.7E(γ): From 149Tm ε decay

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