ADOPTED LEVELS, GAMMAS for 102Nb

Author: D. De Frenne |  Citation: Nucl. Data Sheets 110, 1745 (2009) |  Cutoff date: 31-Dec-2008 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=7260 keV 9S(n)= 5494 keV 5S(p)= 10429 keV 9Q(α)= -6435 keV 9
Reference: 2012WA38

References:
  A  102Zr β- decay:2.9 S  B  252Cf SF decay

General Comments:

Levels: The level scheme of 102Nb is extremely complicated and it is not even clear what the Jπ of the ground state and the long lived isomer is. Therefore the experimental results are given in 3 subsets of data as no unique level scheme could be obtained. Further experiments are absolutely necessary to solve that problem

Levels: All band assignments are from 2001Hw01,1998Hw08 in 252Cf SF decay. Due to the controversy about the position of the ground state an the isomer, band (β) on the Jπ=1+ state mentioned in 252Cf SF decay has been omitted.

Gammas: Two sets of γ’s 64.5 and 64.46 keV and 97.4 and 96.4 keV appear in both data sets and are very probably the same. However their exact position in the level scheme is not clear for the moment and more experiments are needed because the level scheme of 102Nb remains very speculative

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

Q-value: Following (2007Ri01), from mass measurements, the energy difference between 102Nb gs and 102Nb isomer is 93 keV 23 with the high spin isomer being the ground state










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0AB (4+) 4.3 s 4 
% β- = 100
     
     0.0+XA  1+ 1.3 s 2 
% β- = 100
     
    20.37+X 9 A       20.38 9 
  100
(E1)
     0.0+X
1+
    64.39+X 9 A  (2+)      64.46 13 
  100
M1
     0.0+X
1+
    93.95+X 17 A       73.58 14 
  100

    20.37+X

   156.36+X 11 A      136.35 22 
  156.14 14 
   41 18 
  100 24 


    20.37+X
     0.0+X

1+
   160.72+X 21 A       96.4 5 
  100

    64.39+X
(2+)
   246.31+X 18 A       85.59 12 
  152.4 60 
  225.35 32 
  246.55 26 
   70 30 
  100 40 
   87 30 
   56 8 




   160.72+X
    93.95+X
    20.37+X
     0.0+X



1+
   258.43+X 15 A      102.02 17 
  258.52 22 
  100 11 
   50 7 


   156.36+X
     0.0+X

1+
   430.7+X 6 A      270.0 5 
  100

   160.72+X

   599.49+X 8 A  1+     442.3 5 
  535.13 9 
  599.48 9 
    3.5 15 
   77 7 
  100 9 



   156.36+X
    64.39+X
     0.0+X

(2+)
1+
   705.08+X 24 A  (1)     458.69 21 
  549.0 5 
  641.2 8 
   69 25 
  100 31 
   34 13 



   246.31+X
   156.36+X
    64.39+X


(2+)
   940.5+X 4 A  (1)     875.8 8 
  940.6 4 
   55 18 
  100 18 


    64.39+X
     0.0+X
(2+)
1+
   0+Y B (1+)       Y
 

 
 
    64.5+Y B (2+)      64.5
  100

   0+Y
(1+)
   161.9+Y B (3+)      97.4
  100

    64.5+Y
(2+)
   287.4+Y B (4+)     125.5
  222.9
  100
   17


   161.9+Y
    64.5+Y
(3+)
(2+)
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   453.1+Y B (5+)     165.7
  291.2
  100
    1.6


   287.4+Y
   161.9+Y
(4+)
(3+)
   632.5+Y B (6+)     179.4
  345.1
  100
    6


   453.1+Y
   287.4+Y
(5+)
(4+)
   871.1+Y B (7+)     238.6
  418.0
  100
   19


   632.5+Y
   453.1+Y
(6+)
(5+)
  1099.6+Y B (8+)     228.5
  467.1
  100
   26


   871.1+Y
   632.5+Y
(7+)
(6+)
  1406.9+Y B (9+)     307.3
  535.8
  100
   28


  1099.6+Y
   871.1+Y
(8+)
(7+)
  1677.5+Y B (10+)     270.6
  577.9
  100
   31


  1406.9+Y
  1099.6+Y
(9+)
(8+)
     0.0+Z B (3-)       Z
 

     0.0
(4+)
   162.8+Z B (4-)     162.8
  100

     0.0+Z
(3-)
   356.2+Z B (5-)     193.4
  356.2
  100
   27


   162.8+Z
     0.0+Z
(4-)
(3-)
   440.8+Z B (2-)     278.0
  440.8
   75
  100


   162.8+Z
     0.0+Z
(4-)
(3-)
   545.0+Z B (3-)     104.2
  188.8
  382.2
  100
   36
   50



   440.8+Z
   356.2+Z
   162.8+Z
(2-)
(5-)
(4-)
   580.6+Z B (6-)     224.4
  417.8
  100
   50


   356.2+Z
   162.8+Z
(5-)
(4-)
   677.2+Z B (4-)      96.6?
  132.2
  236.4
 
  100
    9



   580.6+Z
   545.0+Z
   440.8+Z
(6-)
(3-)
(2-)
   833.0+Z B (7-)     252.4
  476.8
  100
   42


   580.6+Z
   356.2+Z
(6-)
(5-)
   852.0+Z B (5-)     174.8
  307.0
  100
   13


   677.2+Z
   545.0+Z
(4-)
(3-)
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  1045.1+Z B (6-)     193.1
  212.1?
  367.9
  100
 
   58



   852.0+Z
   833.0+Z
   677.2+Z
(5-)
(7-)
(4-)
  1116.9+Z B (8-)     283.9
  536.3
  100
   72


   833.0+Z
   580.6+Z
(7-)
(6-)
  1284.2+Z B (7-)     239.1
  432.2
  100
   30


  1045.1+Z
   852.0+Z
(6-)
(5-)
  1421.7+Z B (9-)     304.8
  588.7
   86
  100


  1116.9+Z
   833.0+Z
(8-)
(7-)
  1584.0+Z B (8-)     301.8
  540.9
  100
   50


  1284.2+Z
  1045.1+Z
(7-)
(6-)
  1758.2+Z B (10-)     336.5?
  641.3
 
  100


  1421.7+Z
  1116.9+Z
(9-)
(8-)
  1854.2+Z B (9-)     268.2
  570.0
  100
   46


  1584.0+Z
  1284.2+Z
(8-)
(7-)
  2286.4+Z B (10-)     432.2
  700.4
  100
   47


  1854.2+Z
  1584.0+Z
(9-)
(8-)

E(level): Calculated by the evaluator using a least-squares procedure based on adopted gammas.

Jπ(level): The consequence of the fact that the high spin level would be the ground state and not the low spin is that the spin assignments proposed by 2001Hw01,1998Hw08 in (HI,xnγ) become very uncertain as they still consider the low spin isomer as the ground state.All other proposed spins for excited states are based on that assumption. Maybe what they consider as a 120 keV level could be the ground state.

T1/2(level): From β-delayed gammas in 102Nb β- decay (1976Ah06)

M(γ): Based on measured conversion coefficients

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Δ^J=1 Band based on (6+)
   632.5+Y (6+)        
   871.1+Y (7+)        
  1099.6+Y (8+)     228.5
  467.1
  100
   26


   871.1+Y
   632.5+Y
(7+)
(6+)
  1406.9+Y (9+)     307.3
  535.8
  100
   28


  1099.6+Y
   871.1+Y
(8+)
(7+)
  1677.5+Y (10+)     270.6
  577.9
  100
   31


  1406.9+Y
  1099.6+Y
(9+)
(8+)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Kπ=3-, α=1.
     0.0+Z (3-)        
   356.2+Z (5-)        
   833.0+Z (7-)     252.4
  476.8
  100
   42


   580.6+Z
   356.2+Z
(6-)
(5-)
  1421.7+Z (9-)     304.8
  588.7
   86
  100


  1116.9+Z
   833.0+Z
(8-)
(7-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Kπ=3-, α=0.
   162.8+Z (4-)        
   580.6+Z (6-)        
  1116.9+Z (8-)     283.9
  536.3
  100
   72


   833.0+Z
   580.6+Z
(7-)
(6-)
  1758.2+Z (10-)     336.5?
  641.3
 
  100


  1421.7+Z
  1116.9+Z
(9-)
(8-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Kπ=2-, α=0.
   440.8+Z (2-)        
   677.2+Z (4-)        
  1045.1+Z (6-)     193.1
  212.1?
  367.9
  100
 
   58



   852.0+Z
   833.0+Z
   677.2+Z
(5-)
(7-)
(4-)
  1584.0+Z (8-)     301.8
  540.9
  100
   50


  1284.2+Z
  1045.1+Z
(7-)
(6-)
  2286.4+Z (10-)     432.2
  700.4
  100
   47


  1854.2+Z
  1584.0+Z
(9-)
(8-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 5 - Kπ=2-, α=1.
   545.0+Z (3-)        
   852.0+Z (5-)        
  1284.2+Z (7-)     239.1
  432.2
  100
   30


  1045.1+Z
   852.0+Z
(6-)
(5-)
  1854.2+Z (9-)     268.2
  570.0
  100
   46


  1584.0+Z
  1284.2+Z
(8-)
(7-)

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(4+) 4.3 s 4 
% β- = 100
-=100.
     0.0+X1+ 1.3 s 2 
% β- = 100
-=100; no it decay reported.
   632.5+Y(6+)   E(level): Δ^J=1 Band based on (6+).
   871.1+Y(7+)   E(level): Δ^J=1 Band based on (6+).
  1099.6+Y(8+)   E(level): Δ^J=1 Band based on (6+).
  1406.9+Y(9+)   E(level): Δ^J=1 Band based on (6+).
  1677.5+Y(10+)   E(level): Δ^J=1 Band based on (6+).
     0.0+Z(3-)   Eγ=z could be γ to (4+) g.s. and not to a level at 120 keV as suggested by 2001Hw01.
E(level): Eγ=z could be γ to (4+) g.s. and not to a level at 120 keV as suggested by 2001Hw01. Kπ=3-, α=1.
   162.8+Z(4-)   E(level): Kπ=3-, α=0.
   356.2+Z(5-)   E(level): Kπ=3-, α=1.
   440.8+Z(2-)   E(level): Kπ=2-, α=0.
   545.0+Z(3-)   E(level): Kπ=2-, α=1.
   580.6+Z(6-)   E(level): Kπ=3-, α=0.
   677.2+Z(4-)   E(level): Kπ=2-, α=0.
   833.0+Z(7-)   E(level): Kπ=3-, α=1.
   852.0+Z(5-)   E(level): Kπ=2-, α=1.
  1045.1+Z(6-)   E(level): Kπ=2-, α=0.
  1116.9+Z(8-)   E(level): Kπ=3-, α=0.
  1284.2+Z(7-)   E(level): Kπ=2-, α=1.
  1421.7+Z(9-)   E(level): Kπ=3-, α=1.
  1584.0+Z(8-)   E(level): Kπ=2-, α=0.
  1758.2+Z(10-)   E(level): Kπ=3-, α=0.
  1854.2+Z(9-)   E(level): Kπ=2-, α=1.
  2286.4+Z(10-)   E(level): Kπ=2-, α=0.

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