ADOPTED LEVELS, GAMMAS for 161Gd

Author: C. W. Reich |  Citation: Nucl. Data Sheets 112,2497 (2011) |  Cutoff date: 1-Jun-2011 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1955.8 keV 15S(n)= 5635.4 keV 10S(p)= 9314 keV 10Q(α)= -1252 keV 5
Reference: 2012WA38

References:
  A  160Gd(d,p)  B  160Gd(n,γ) E=TH
  C  161Eu β- decay 

General Comments:

Data are from only three measurements: 161Eu β- decay (1986Ma12), 160Gd(d,p) (1967Tj01), and 160Gd(n,γ) (1971Gr42).

Levels: 1971Ma41, 1973Ga29 (same results as 1971Ma41), and 1975Ma48 give calculated contributions of Nilsson states and vibrations to various bandheads. (All three papers have Soloviev as an author.) For levels which the authors associate with the experimental levels at 0, 314, 355, and 809 keV, the calculated contributions from the Nilsson states indicated here are from 84 to 98%. In contrast, for the 1/2- level at 1311 keV, the calculated contribution of the 1/2[510] Nilsson state varies from 0.7% to 27% with the other contributions from vibrational states.

Levels: Resonance parameters are given in the Atlas of Neutron Resonances (2006MuZX), which lists 57 neutron resonances, mostly having Jπ=1/2+. See, also, 1969Ka26 and 1974Ra23, as well as 1969Mu04 and 1973Mu14, previous publications by the author of 2006MuZX.

Gammas: No γ intensities are given here; see the 160Gd(n,γ) data for a few intensities given (in γ’s per 100 n captures).

Q-value: Note: Current evaluation has used the following Q record

Q-value: 2003Au03 report the same values for Q(β-) and S(n). For S(p) and Q(α), 2003Au03 report 9430, from systematics, and 1200 50, respectively.








E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
Final Levels
     0ABC 5/2- 3.66 m 5 
% β- = 100
   
    71.9 2 A C 7/2-       71.9 2 
     0
5/2-
   163.7 2 A C 9/2-       91.9 2 
   163.7 2 
    71.9
     0
7/2-
5/2-
   276 3 A   11/2-      
   314.3 3 ABC 3/2-      314.3 3 
     0
5/2-
   355 1 AB  1/2-      
   394.7 1 AB  3/2-      394.7 10 
     0
5/2-
   438 3 A   7/2-      
   438 3 A   5/2-      
   510 3 A   9/2+      
   529 3 A   7/2-      
  ≈585A   11/2+      
   604 3 A   9/2-      
   645 3 A   11/2-      
   681 3 A   13/2+      
  ≈753A   11/2-      
   804.3 1  B       804.3 10 
     0
5/2-
  ≈809A   5/2-      
   824 1  B       469.0 10 
   355
1/2-
   834 3 A   (1/2,3/2)-      
   851 1  B       
   889 3 A   7/2-      
   898 2  B       
   925 3 A        
   972A        
   994 3 A   9/2-      
  1036 1  B       
  1049 5 A        
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
Final Levels
  1097 5 A        
  1123 5 A   11/2-      
  1128 1  B       
  1177 5 A        
  1273 1  B      1273 1 
     0
5/2-
  1311 1 AB  1/2-      
  1338 1 AB  3/2-     1338 1 
     0
5/2-
  1380 1 AB       
  1403 5 A   5/2-      
  1408 1 AB       
  1466 5 A   7/2-      
  1490 1 AB  1/2+     1490 1 
     0
5/2-
  1501 5 A   3/2+      
  1523 1 AB       
  1545 1  B       
  1556 5 A   5/2+      
  1591 5 A   7/2+      
  1615 5 A        
  1643 5 A        
  1664 5 A        
  1751 1  B       
  1803 1  B       
  1848 1  B       
  1923 1  B       

Jπ(level): Band and Jπ assignments are from the (d,p) study (1967Tj01), except for the 834 level. They are based on agreement of measured and calculated dσ/d|W values, angular distributions, and energy separations within bands. See 160Gd(d,p) for authors’ comments on the definitiveness of the assignments.

E(γ): See the 160Gd(n,γ) data for the primary γ’s from the thermal-neutron capture state at 5635.4 keV.

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 1 - 5/2[523] band.
     0 5/2- 3.66 m 5 
% β- = 100
   
    71.9 2  7/2-       71.9 2 
     0
5/2-
   163.7 2  9/2-       91.9 2 
   163.7 2 
    71.9
     0
7/2-
5/2-
   276 3  11/2-      
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 2 - 3/2[521] band.
   314.3 3  3/2-      
   438 3  7/2-     
   645 3  11/2-     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 3 - 1/2[521] band.
   355 1  1/2-      
   394.7 1  3/2-      394.7 10 
     0
5/2-
   438 3  5/2-     
   529 3  7/2-      
   604 3  9/2-     
  ≈753 11/2-      
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 4 - 7/2[633] band.
   510 3  9/2+      
  ≈585 11/2+     
   681 3  13/2+     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 5 - 5/2[512] band.
  ≈809 5/2-      
   889 3  7/2-     
   994 3  9/2-     
  1123 5  11/2-      
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 6 - 1/2[510] band.
  1311 1  1/2-      
  1338 1  3/2-     1338 1 
     0
5/2-
  1403 5  5/2-     
  1466 5  7/2-      
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)Final Levels
Band 7 - 1/2[651] band.
  1490 1  1/2+      
  1501 5  3/2+     
  1556 5  5/2+     
  1591 5  7/2+      

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     05/2- 3.66 m 5 
% β- = 100
E(level): 5/2[523] band.
    71.97/2-   E(level): 5/2[523] band.
   163.79/2-   E(level): 5/2[523] band.
   27611/2-   E(level): 5/2[523] band.
   314.33/2-   E(level): 3/2[521] band.
   3551/2-   E(level): 1/2[521] band.
   394.73/2-   E(level): 1/2[521] band.
   4387/2-   E(level): 3/2[521] band.
   4385/2-   E(level): 1/2[521] band. Assigned as doublet in (d,p) (1967Tj01).
   5109/2+   E(level): 7/2[633] band.
   5297/2-   E(level): 1/2[521] band.
   58511/2+   E(level): 7/2[633] band.
   6049/2-   E(level): 1/2[521] band.
   64511/2-   E(level): 3/2[521] band.
   68113/2+   E(level): 7/2[633] band.
   75311/2-   E(level): 1/2[521] band.
   8095/2-   E(level): 5/2[512] band.
   834(1/2,3/2)-   Jπ(level): From L=1 in (p,p) for isobaric analog state (1973Me24).
   8897/2-   E(level): 5/2[512] band.
   972   Jπ(level): Tentatively assigned as 13/2 member of 9/2[624] by 1967Tj01, but assignment not adopted.
   9949/2-   E(level): 5/2[512] band.
  112311/2-   E(level): 5/2[512] band.
  13111/2-   E(level): 1/2[510] band.
  13383/2-   E(level): 1/2[510] band.
  14035/2-   E(level): 1/2[510] band.
E(level)Jπ(level)T1/2(level)Comments
  14667/2-   E(level): 1/2[510] band.
  14901/2+   E(level): 1/2[651] band.
  15013/2+   E(level): 1/2[651] band.
  15565/2+   E(level): 1/2[651] band.
  15917/2+   E(level): 1/2[651] band.

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