ADOPTED LEVELS, GAMMAS for 184Tl
Author: Coral M. Baglin | Citation: Nucl. Data Sheets 111,275 (2010) | Cutoff date: 1-Oct-2009
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=-5822 keV 24 | S(n)= 8357 keV 23 | S(p)= 358 keV 22 | Q(α)= 6.30×103 keV 3 | ||
| Reference: 2012WA38 |
| References: | |||
| A | 188Bi α decay (265 MS) | B | 188Bi α decay (60 MS) |
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0 | 10.1 s 5 % ε = 97.9 7 % α = 2.1 7 | |||||||
| 0.0+X | A | (7+) | ||||||
| 0.0+Y | B | (2-) | ||||||
| 70.6+X 5 | A | (6+) | 70.5 5 | 100 | M1 | 0.0+X | (7+) | |
| 117.5+Y 5 | B | (3+) | 117.5 5 | 100 | E1 | 0.0+Y | (2-) | |
| 216.5+Y 7 | B | (2-,3-,4-) | 99.0 5 | 100 | (E1) | 117.5+Y | (3+) | |
| 319.8+X 8 | A | 249 1 320 1 | | 70.6+X 0.0+X | (6+) (7+) | |||
| 500+X 7 | A | (10-) | ||||||
E(level): From least-squares fit to Eγ, except as noted
E(γ): From 188Bi α decay (265 ms), except as noted.
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 70.6+X | (6+) | 70.5 5 | M1 | 4.36 | α=4.36 11 | |
| 117.5+Y | (3+) | 117.5 5 | E1 | 0.287 | α=0.287 5 | |
| 216.5+Y | (2-,3-,4-) | 99.0 5 | (E1) | 0.441 | α=0.441 9 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0 | 10.1 s 5 % ε = 97.9 7 % α = 2.1 7 | E(level): From 188Bi α decay (265 ms). It is possible that x=0, in which case the 0.0+x (7+) level would Be the g.s.. | |
| 0.0+X | (7+) | E(level): From 188Bi α decay (265 ms). It is possible that x=0, in which case the 0.0+x (7+) level would Be the g.s.. |
| E(level) | E(gamma) | Comments |
| 70.6+X | 70.5 | M(γ): from α(exp) in 188Bi α decay (265 ms). |
| 117.5+Y | 117.5 | E(γ): From 188Bi α decay (60 ms). M(γ): from α(K)exp in 188Bi α decay (60 ms). |
| 216.5+Y | 99.0 | E(γ): From 188Bi α decay (60 ms). M(γ): from α(K)exp in 188Bi α decay (60 ms). |
The odd-odd 186Tl-198Tl isotopes all exhibit isomer pairs. 184Tl ε decay apparently populates both high and low spin states (Jπ=2+, 4+, 6+ and 8+). Mutually consistent values of half-life have been reported for both α and ε decay, suggesting either that the isomer and ground state have comparable half-lives, or that an unidentified isomeric transition populates the ground state which is in equilibrium. See 1990Va15 for calculation of level energies and configuration for the heavier odd-odd Tl isotopes.
Q-value: Note: Current evaluation has used the following Q record -5840 50 8370 50 370 50 6290 50 2003Au03,2009AuZZ