ADOPTED LEVELS, GAMMAS for 140Sb
Author: N. Nica | Citation: Nucl. Data Sheets 154, 1 (2018) | Cutoff date: 20-Nov-2018
Full ENSDF file | Adopted Levels (PDF version)
| Q(β-)=12640 keV SY | S(n)= 2220 keV SY | S(p)= 12790 keV SY | Q(α)= -5850 keV SY | ||
| Reference: 2017WA10 |
| References: | |||
| A | 140Sb IT decay (41 μs) | ||
| E(level) (keV) | XREF | Jπ(level) | T1/2(level) | E(γ) (keV) | I(γ) | M(γ) | Final Levels | |
| 0.0 | A | (3-,4-) | 173 ms 12 % β- = 100 % β-n = 23 4 % β-2n = 7.6 25 | |||||
| 70.9 8 | A | (4-,5-) | 70.9 8 | 100 | (M1) | 0.0 | (3-,4-) | |
| 298.2 10 | A | (5-,6-) | 227.3 5 | 100 | [M1,E2] | 70.9 | (4-,5-) | |
| 298.2+X | A | (6-,7-) | 41 µs 8 % IT = 100 | X | | 298.2 | (5-,6-) | |
M(γ): Estimated by 2016Lo01 from intensity balance and theoretical arguments based on which E1, E3 and M2 type of transitions between levels of opposite parities are not considered likely based on expected active spherical orbitals involved in the low-lying structure of 140Sb. Particular arguments are given in the table when avaible
| E(level) (keV) | Jπ(level) | T1/2(level) | E(γ) (keV) | Multipolarity | Conversion Coefficient | Additional Data |
| 70.9 | (4-,5-) | 70.9 8 | (M1) | 1.66 | α=1.66 6, α(K)=1.43 6, α(L)=0.185 7, α(M)=0.0366 14, α(N)=0.0070 3, α(O)=0.00069 3 | |
| 298.2 | (5-,6-) | 227.3 5 | [M1,E2] | 0.079 | α=0.079 15, α(K)=0.066 11, α(L)=0.0103 33, α(M)=0.00206 67, α(N)=3.9×10-4 12, α(O)=3.5E-5 9 |
Additional Level Data and Comments:
| E(level) | Jπ(level) | T1/2(level) | Comments |
| 0.0 | (3-,4-) | 173 ms 12 % β- = 100 % β-n = 23 4 % β-2n = 7.6 25 | %β-n and %β-2n are lower limits deduced by the authors from only the γ-ray data without accounting for any direct feedings to the ground states of 139Te and 138Te. Value of %β-2n is deduced more precisely (by B. Singh) from summed intensities of 442.8 and 460.8 gamma rays (Table I). 2017Mo12 quote ≈8%. The normalization procedure is not clearly stated in 2017Mo12. E(level): %β-n and %β-2n are lower limits deduced by the authors from only the γ-ray data without accounting for any direct feedings to the ground states of 139Te and 138Te. Value of %β-2n is deduced more precisely (by B. Singh) from summed intensities of 442.8 and 460.8 gamma rays (Table I). 2017Mo12 quote ≈8%. The normalization procedure is not clearly stated in 2017Mo12. |
| 298.2 | (5-,6-) | Jπ(level): Assigned by 2016Lo01 based on ΔJ=1,2, Δπ=no expected type of transition. | |
| 298.2+X | (6-,7-) | 41 µs 8 % IT = 100 | Possible configuration=πg7/21~#νf7/2-1 (2016Lo01). Jπ(level): Assigned by 2016Lo01 based on ΔJ=1,2, Δπ=no expected type of transition. |
| E(level) | E(gamma) | Comments |
| 70.9 | 70.9 | M(γ): pure E2 is ruled out by 2016Lo01 since with a total conversion coefficient of 5.61, its Iγ would be about five times smaller than that of the 227.3 transition. Note that even with M1 multipolarity of the 70.9 transition, its total intensity (I(γ+ce)) is about 2.7 times larger than that of the 227 transition whereas one would expect equal intensity if the decay scheme of the isomer is complete |
| 298.2 | 227.3 | E(γ): this transition is unlikely to be the isomeric transition since the implied B(M1) or B(E2) would be too small to be consistent with expected transition rates from Weisskopf estimates |
| 298.2+X | X | E(γ): x<30 keV if E2, <1-2 keV if M1 (2016Lo01), based on consideration of transition rates in this mass region, and γ-energy detection threshold in this experiment |
2010Oh02: 140Sb nuclide identified in Be(238U,F) and Pb(238U,F) reactions with a 238U86+ beam energy of 345 MeV/nucleon produced by the cascade operation of the RBIF accelerator complex of the linear accelerator RILAC and four cyclotrons RRC, fRC, IRC and SRC. Identification of 140Sb nuclei was made on the basis of magnetic rigidity, time-of-flight and energy loss of the fragments using BigRIPS fragment separator. Experiments performed at RIKEN facility.
Based on α/Q spectrum and Z versus α/Q plot, 124 counts were assigned to 140Sb isotope. (Q=charge state)
2007Ot03: calculated proton single-particle level energies
2017Mo12 (compiled for XUNDL compilation by B. Singh (McMaster)): 140Sb produced in 9Be(238U,F), E(238U)=345 MeV per nucleon using BigRIPS spectrometer at RIBF-RIKEN facility. Measured reaction products using WAS3ABi system of Si detectors, Eγ, Iγ, γγ-coin, β, %β-n and %β-2n and half-life of 140Sb decay using EURICA HPGe cluster array.
2017Mo12 report the first measurement of half-life of 140Sb decay
Q-value: Uncertainties based on syst are: ΔQ(β-)=600, ΔS(n)=720, ΔS(p)=780, ΔQ(α)=720
Q-value: S(2n)=5860 1220 (2017Wa10,syst), Q(β-n)=8200 600 (2017Wa10,syst)