ADOPTED LEVELS, GAMMAS for 168Ir

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 111, 1807 (2010) |  Cutoff date: 15-Jun-2010 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-7.66×103 keV 14S(n)= 9.71×103 keV 8S(p)= -5.0×102 keV 11Q(α)= 6381 keV 9
Reference: 2012WA38

References:
  A  172Au α decay (22 MS)  B  172Au α decay (7.7 MS)

General Comments:

Identification: comparison of 108Cd(63Cu,xn) excitation functions for known and new Ir activities; Eα for (63Cu,3n) product is consistent with Eα predicted for 168Ir by α-energy systematics (1978Ca11).

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

Q-value: ΔQ(β)=240, ΔS(n)=150, ΔS(p)=170 (2003Au03, 2009AuZZ).








E(level)
(keV)
XREF T1/2(level)E(γ)
(keV)
I(γ)Final Levels
     0.0A  222 ms +60-40 
% ε = ?
% α ≤ 100
% p = ?
    
     0.0+X B 159 ms +16-13 
% p = ?
% α = 77 9
% ε ≤ 23 9
    
  72+X 12  B     72 12 ?
  100
     0.0+X

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0 222 ms +60-40 
% ε = ?
% α ≤ 100
% p = ?
%α: only α decay has been observed, but ε+β+ and p decay are possible. Gross β decay theory (1973Ta30) predicts T1/2(ε+β+)≈1 s implying %ε+%β+≈22% and 1997Mo25 predict T1/2(ε+β+)=359 ms implying %ε+%β+=62%, so ε+β+ branching is expected to Be appreciable.
E(level): %α: only α decay has been observed, but ε+β+ and p decay are possible. Gross β decay theory (1973Ta30) predicts T1/2(ε+β+)≈1 s implying %ε+%β+≈22% and 1997Mo25 predict T1/2(ε+β+)=359 ms implying %ε+%β+=62%, so ε+β+ branching is expected to Be appreciable.
     0.0+X 159 ms +16-13 
% p = ?
% α = 77 9
% ε ≤ 23 9
%α: weighted average of 82 14 (1996Pa01) and 75 11 (2009Ha42); only α decay has been observed, but a significant ε+β+ branch is expected and p decay is probably possible also.
E(level): %α: weighted average of 82 14 (1996Pa01) and 75 11 (2009Ha42); only α decay has been observed, but a significant ε+β+ branch is expected and p decay is probably possible also.

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Additional Gamma Comments:

E(level)E(gamma)Comments
  72+X    72E(γ): from level energy difference. Consistent with E=65.0 4 and 73.0 6 for photons observed to Be correlated with 6800α from 172Au(7.7 ms), but those energies (and their relative Iγ) are also close to expectation for Kα| x ray and Kβ| x ray for Ir so they possibly result, instead, from a highly-converted transition at somewhat higher energy. If so, the presence of K| x ray implies Eγ>76 keV, the K shell binding energy for Ir.

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