ADOPTED LEVELS, GAMMAS for 164Ta

Authors: Balraj Singh and Jun Chen |  Citation: Nucl. Data Sheets 147, 1 (2018) |  Cutoff date: 30-Nov-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-5047 keV 30S(n)= 8820 keV 50S(p)= 1310 keV 40Q(α)= 4560 keV 60
Reference: 2017WA10

References:
  A  164W ε decay (6.3 S)  B  168Re α decay (4.4 S)
  C  142Nd(27Al,5nγ),141Pr(28Si,5nγ) 

General Comments:

1983Sc18, 1982Ei03: 164Ta produced and identified in 127I(40Ca,3n) (1983Sc18) and 151Eu(20Ne,7N) (1982Ei03) reactions, followed by detection of γ rays in 164Hf from the decay 164Ta. Also 1982Li17, where 164Ta was produced in Lu(3He,xn),E=280 MeV reaction, and half-life was measured. The Z assignment was based on γ(x ray)-coin measurement in 164Ta ε decay. The mass assignment was deduced from measured excitation functions by 1983Sc18. Later studies of 164Ta decay: 1986Ru05, 1989Hi04, 1989Br19, 1992Ha10

Levels: B(M1)/B(E2) ratios listed in the table assume mixing ratio δ=0 for cascading transitions in the bands

Q-value: S(2n)=19650 60, S(2p)=5030 80, Q(εp)=4220 40 (2017Wa10)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0AB  (3+) 14.2 s 3 
% ε = 100
     
   0+X  C        
   0+Y  C        
    93.7+X 3   C      93.7 3 
 

   0+X

   111.5 3 AB      111.5 3 
 

     0.0
(3+)
   131.0+Y 10   C     131 1 ?
  100

   0+Y

   188.7+X 4   C      95.0 3 
 

    93.7+X

   321.0+Y 15   C     190 1 ?
 

   131.0+Y

   329.2+X 4   C (11-)     140.5 3 
  235.5 3 
   57.2 11 
  100 4 


   188.7+X
    93.7+X


   515.0+Y 18   C     194 1 ?
  100

   321.0+Y

   523.4+X 5   C (12-)     194.3 3 
  100
(M1)
   329.2+X
(11-)
   704.1+X 5   C (13-)     180.7 3 
  374.8 3 
  100 21 
   66 14 
(M1)

   523.4+X
   329.2+X
(12-)
(11-)
   743.1+Y 19   C     228 1 
  100
(M1)
   515.0+Y

   987.4+X 5   C (14-)     283.3 3 
  464.0 3 
  100 3 
   64 13 
(M1)
(E2)
   704.1+X
   523.4+X
(13-)
(12-)
   999.9+Y 19   C     257 1 
  485 1 ?
   98 18 
  100 23 


   743.1+Y
   515.0+Y


  1234.1+X 5   C (15-)     246.7 3 
  530.0 3 
   70 3 
  100 9 
(M1)
(E2)
   987.4+X
   704.1+X
(14-)
(13-)
  1281.3+Y 20   C     281 1 
  538 1 
  100 50 
   90 40 

(E2)
   999.9+Y
   743.1+Y


  1572.7+X 6   C (16-)     338.6 3 
  585.3 3 
   73 8 
  100 17 
(M1)
(E2)
  1234.1+X
   987.4+X
(15-)
(14-)
  1594.4+Y 21   C     313 1 
  595 1 
   57 39 
  100 59 
(M1)

  1281.3+Y
   999.9+Y


  1872.6+X 6   C (17-)     299.9 5 
  638.5 3 
   57 11 
  100 8 
(M1)
(E2)
  1572.7+X
  1234.1+X
(16-)
(15-)
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  1925.7+Y 21   C     332 1 
  644 1 
 
  100
(M1)

  1594.4+Y
  1281.3+Y


  2247.9+X 6   C (18-)     375.3 5 
  675.2 5 
  100 33 
   69 17 
(M1)
(E2)
  1872.6+X
  1572.7+X
(17-)
(16-)
  2285.6+Y 22   C     360 1 
  691 1 
 
 

(E2)
  1925.7+Y
  1594.4+Y


  2591.6+X 7   C (19-)     343.7 5 
  719.0 5 
  100 14 
   91 45 
(M1)
(E2)
  2247.9+X
  1872.6+X
(18-)
(17-)
  2995.9+X 7   C (20-)     404.3 3 
  748.0 5 
  100 3 
   55 7 
(M1)
(E2)
  2591.6+X
  2247.9+X
(19-)
(18-)
  3350.7+X 10 ?  C (21-)     355?
  759?
 
 


  2995.9+X
  2591.6+X
(20-)
(19-)

E(level): From 142Nd(27Al,5nγ),141Pr(28Si,4nγ), except for the 111.5-keV level which is populated in decay data. Tentative levels at 11.4, 443.6, 483.6 and 513.1 keV are populated in 164W decay (see 164W ε decay (6.3 s)) level scheme in 164W ε decay

Jπ(level): As proposed by 2002Ro01 based on 11- for the bandhead and interlocking cascades of M1 and E2 transitions in the π9/2[514]ν1/2[660]band. The measured DCO ratios and polarization asymmetries are in general agreement.

M(γ): From DCO ratios and pol values for transitions in coupled band structures populated in 142Nd(27Al,5nγ) reaction

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - π9/2[514]~#ν1/2[660],α=0
   523.4+X 5  (12-)        
   987.4+X 5  (14-)        
  1572.7+X 6  (16-)        
  2247.9+X 6  (18-)     375.3 5 
  675.2 5 
  100 33 
   69 17 
(M1)
(E2)
  1872.6+X
  1572.7+X
(17-)
(16-)
  2995.9+X 7  (20-)     404.3 3 
  748.0 5 
  100 3 
   55 7 
(M1)
(E2)
  2591.6+X
  2247.9+X
(19-)
(18-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - π9/2[514]~#ν1/2[660],α=1
   329.2+X 4  (11-)        
   704.1+X 5  (13-)        
  1234.1+X 5  (15-)        
  1872.6+X 6  (17-)     299.9 5 
  638.5 3 
   57 11 
  100 8 
(M1)
(E2)
  1572.7+X
  1234.1+X
(16-)
(15-)
  2591.6+X 7  (19-)     343.7 5 
  719.0 5 
  100 14 
   91 45 
(M1)
(E2)
  2247.9+X
  1872.6+X
(18-)
(17-)
  3350.7+X 10  (21-)     355?
  759?
 
 


  2995.9+X
  2591.6+X
(20-)
(19-)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - πh11/2~#νh9/2~#(νi13/22) (?).
   0+Y        
   131.0+Y 10         
   321.0+Y 15         
   515.0+Y 18      194 1 ?
  100

   321.0+Y

   743.1+Y 19      228 1 
  100
(M1)
   515.0+Y

   999.9+Y 19      257 1 
  485 1 ?
   98 18 
  100 23 


   743.1+Y
   515.0+Y


  1281.3+Y 20      281 1 
  538 1 
  100 50 
   90 40 

(E2)
   999.9+Y
   743.1+Y


  1594.4+Y 21      313 1 
  595 1 
   57 39 
  100 59 
(M1)

  1281.3+Y
   999.9+Y


  1925.7+Y 21      332 1 
  644 1 
 
  100
(M1)

  1594.4+Y
  1281.3+Y


  2285.6+Y 22      360 1 
  691 1 
 
 

(E2)
  1925.7+Y
  1594.4+Y


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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(3+) 14.2 s 3 
% ε = 100
α 4625 15 (0.016% 5) α group was attributed to the decay of 164Ta by 1983Sc18; however, it was assigned to the decay of 163Ta by 1986Ru05 (also 1992Ha10,1988MeZY) from its half life and from its energy fit to the Q(α) systematics. Thus 164Ta is not considered as an α emitter.
   0+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
   131.0+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
   321.0+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
   329.2+X(11-)   B(M1)/B(E2)=0.10 1, assuming E2 for 235γ and M1 for 140.5γ.
E(level): π9/2[514]~#ν1/2[660],α=1.
   515.0+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
   523.4+X(12-)   E(level): π9/2[514]~#ν1/2[660],α=0.
   704.1+X(13-)   B(M1)/B(E2)=1.3 4 assuming E2 for 375γ.
E(level): π9/2[514]~#ν1/2[660],α=1.
   743.1+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
   987.4+X(14-)   B(M1)/B(E2)=1.03 21.
E(level): π9/2[514]~#ν1/2[660],α=0.
   999.9+Y   B(M1)/B(E2)=1.1 3, assuming E2 for 485γ and M1 for 257γ.
E(level): πh11/2~#νh9/2~#(νi13/22) (?).
  1234.1+X(15-)   B(M1)/B(E2)=1.33 14.
E(level): π9/2[514]~#ν1/2[660],α=1.
  1281.3+Y   B(M1)/B(E2)=1.1 3, assuming M1 for 281γ.
E(level): πh11/2~#νh9/2~#(νi13/22) (?).
  1572.7+X(16-)   B(M1)/B(E2)=0.89 18.
E(level): π9/2[514]~#ν1/2[660],α=0.
  1594.4+Y   B(M1)/B(E2)=1.0 9, assuming M1 for 313γ and E2 for 595γ.
E(level): πh11/2~#νh9/2~#(νi13/22) (?).
  1872.6+X(17-)   B(M1)/B(E2)=1.6 3.
E(level): π9/2[514]~#ν1/2[660],α=1.
  1925.7+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
  2247.9+X(18-)   B(M1)/B(E2)=2.7 12.
E(level): π9/2[514]~#ν1/2[660],α=0.
  2285.6+Y   E(level): πh11/2~#νh9/2~#(νi13/22) (?).
  2591.6+X(19-)   B(M1)/B(E2)=3.6 16.
E(level): π9/2[514]~#ν1/2[660],α=1.
  2995.9+X(20-)   B(M1)/B(E2)=4.5 6.
E(level): π9/2[514]~#ν1/2[660],α=0.
  3350.7+X(21-)   E(level): π9/2[514]~#ν1/2[660],α=1.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   111.5   111.5E(γ): average of 111.8 in 168Re α decay and 111.2 in 164W ε decay

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