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 14 | S(n)= 9.71×103 keV 8 | S(p)= -5.0×102 keV 11 | Q(α)= 6381 keV 9 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 172Au α decay (22 MS) | B | 172Au α decay (7.7 MS) |
| E(level) (keV) | XREF | T1/2(level) | E(γ) (keV) | I(γ) | Final Levels | |
| 0.0 | A | 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 | ||
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. |
| E(level) | E(gamma) | Comments |
| 72+X | 72 | E(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. |
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 -7700 SY9730 syst-470 SY6480 50 2003Au03,2009AuZZ
Q-value: ΔQ(β)=240, ΔS(n)=150, ΔS(p)=170 (2003Au03, 2009AuZZ).