ADOPTED LEVELS, GAMMAS for 208Tl

Author: M. J. Martin |  Citation: Nucl. Data Sheets 108,1583 (2007) |  Cutoff date: 1-Jun-2007 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=4998.9 keV 18S(n)= 3787 keV 6S(p)= 7.55×103 keV 3Q(α)= 1.48×103 keV SY
Reference: 2012WA38

References:
  A  212Bi α decay (60.55 M)  B  208Pb(t,3He)
  C  208Pb(n,p),(7Li,7Be),(13C,13N)  D  212Bi α decay (25.0 M)
  E  208Hg β- decay  F  208Pb(π-,PI0)








E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
      0.0AB DE  5+ 3.053 m 4 
% β- = 100
     
     39.858 4 AB DE  4+ 6.5 ps 8      39.858 4 
  100
M1
      0.0
5+
    328.04 5 AB D   5+ > 0.1 ps    288.20 4 
   328.03 4 
  100.0 9 
   37.2 18 
M1
M1
     39.858
      0.0
4+
5+
    473.4 4 AB  E  (4+)      433.7 5 
   473.0 7 
   34 7 
  100 7 
(M1)
(M1)
     39.858
      0.0
4+
5+
    492.84 4 AB  E  (3)+      164.0?
   452.98 5 
   493.3 7 ?
 
  100.0 9 
   <1

M1

    328.04
     39.858
      0.0
5+
4+
5+
    617    E       143.6
   288.8
 
 


    473.4
    328.04
(4+)
5+
    620.4 3 AB D   (6+)      576?
   620?
 
 


     39.858
      0.0
4+
5+
    698 45  B            
    760A   E       142.0
   266.9
   285.4
 
 
 



    617
    492.84
    473.4

(3)+
(4+)
    789 14  B            
      8E+2 3   C    (1-)        
    803A   E        43.0
   310.4
 
 


    760
    492.84

(3)+
   1135 15  B            
   1199 57  B            
   1245 49  B            
   1322 14  B            
   1362    E       559.1
   602.2
 
 


    803
    760


   1410 15  B            
   1474 15  B            
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   1525 18  B            
   1637 18  B            
   1652    E       290.0
   849.2
   892.3
  1159.0
 
 
 
 




   1362
    803
    760
    492.84



(3)+
   1696 37  B            
   1728    E       365.8
   925.0
   968.0
  1235.0
 
 
 
 




   1362
    803
    760
    492.84



(3)+
   1775 27  B            
   1851 18  B            
   1912 49  B            
      1.97E+3 14  B            
   2013 64  B            
   2093 25  B            
   2197 14  B            
   2632 13  B            
      2.7E+3 2   C    (1-)        
   2720 13  B            
   2794 25  B            
   2861 24  B            
   2917 49  B            
   3053 15  B            
   3194 15  B            
   3255 19  B            
   3325 26  B            
   3400 15  B            
   3482 15  B            
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
  ≈4000  C           
   4285 12  B            
      5.1E+3 2   C    (0)-        
  ≈5800  C    (2+)        
      7.0E+3 28   C    (0)+        
      8.3E+3 2   C    (2+,3+)        
     13.6E+3 2   C    (1)+        
     16.5E+3 20   C           
     20.4E+3 20   C           

Jπ(level): From the shell model, one expects a 4+, 5+ doublet with configuration=ν2g9/2π3s1/2-1 as ground state and low-lying excited level followed by the 3+, 4+, 5+, 6+ multiplet with configuration=ν2g9/2π2d3/2-1 at ≈400-keV excitation. Both configurations are expected to Be fed in 212Bi α decay. Within the framework of this expected multiplet picture, given Jπ=5+ for the 328 level, the 474, 493, and 620 levels, which have the strongest α feedings, may have Jπ=4+, 3+, and 6+, respectively. These assignments are consistent with α-decay systematics (1980Sc26). See 1992Ar05 for details on αγ(θ)

I(γ): Relative photon branching from each level. Data are from 60.55-min 212Bi α decay. Additional data are available from β- decay, but are discrepant with those from α decay and are not adopted

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
     39.858 4+ 6.5 ps 8      39.858 4 M124.4B(M1)(W.u.)=2.1 3, α=24.4
    328.04 5+ > 0.1 ps    288.20 4 M10.455B(M1)(W.u.)<4.7, α=0.455
5+ > 0.1 ps    328.03 4 M10.320B(M1)(W.u.)<1.3, α=0.320
    473.4 (4+)      433.7 5 (M1)0.151α=0.151
(4+)      473.0 7 (M1)0.120α=0.120
    492.84 (3)+      452.98 5 M10.135α=0.135

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.05+ 3.053 m 4 
% β- = 100
μ=0.292 13 (1992La03,2005St24)
configuration: μ is larger than expected for a pure configuration=ν2g9/2π3s1/2-1 5+ state. 1992La03 point out that a 25% admixture of configuration=ν2g9/2π2d3/2-1 would explain the reduction in μ; however, this admixture leads to disagreement with the 208Tl-207Tl rms radius change.

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Additional Gamma Comments:

E(level)E(gamma)Comments
    492.84    164.0E(γ): reported in β- decay with Iγ/Iγ(433γ)=0.48, but this transition is not seen in α decay. From the E(level) difference one expects Eγ=164.8

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