Xenon-139
Properties and data of the isotope 139Xe.
See also: List of individual Xenon isotopes (and general data sources).
General data
Name of the isotope:Xenon-139; Xe-139Symbol:139Xe or 13954XeMass number A:139 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:85Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.5740740740741 (= neutron-proton ratio)Neutron excess (N-Z):31Isotopic mass:138.9187922(23) u (atomic weight of Xenon-139)Nuclide mass:138.8891708 u (calculated nuclear mass without electrons)Mass excess:-75.64458 MeVMass defect:1.240277388 u (per nucleus)Nuclear binding energy:1155.31094526 MeV (per nucleus)
8.31158953 MeV (average binding energy per nucleon)Separation energy:SN = 3.744(4) MeV (first neutron)
SP = 10.954(6) MeV (first proton)Half-life:39.68(14) sDecay constant λ:0.017468426929434 s-1Specific activity α:7.622994751490 × 10+19 Bq g-1
2060268851.7541 Ci g-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = - 0.3040(16)Quadrupole moment Q:0.396 barn (100 fm2)Nuclear g-factor:gl = -0.20266666666667Charge radius:4.8409(100) femtometer fmYear of discovery:1951
Radioactive Decay
Half-life T½ = 39.68(14) s respectively 3.968 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 139Cs | 100 % | 5.056(4) MeV | |
Parent Nuclides
Direct parent isotopes are: 139I, 248Cm, 252Cf.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 139) with Xenon-139. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 85 | Isobar A = 139 |
|---|
| 47 | 132Ag | |
| 48 | 133Cd | |
| 49 | 134In | |
| 50 | 135Sn | 139Sn |
| 51 | 136Sb | 139Sb |
| 52 | 137Te | 139Te |
| 53 | 138I | 139I |
| 54 | 139Xe | 139Xe |
| 55 | 140Cs | 139Cs |
| 56 | 141Ba | 139Ba |
| 57 | 142La | 139La |
| 58 | 143Ce | 139Ce |
| 59 | 144Pr | 139Pr |
| 60 | 145Nd | 139Nd |
| 61 | 146Pm | 139Pm |
| 62 | 147Sm | 139Sm |
| 63 | 148Eu | 139Eu |
| 64 | 149Gd | 139Gd |
| 65 | 150Tb | 139Tb |
| 66 | 151Dy | 139Dy |
| 67 | 152Ho | |
| 68 | 153Er | |
| 69 | 154Tm | |
| 70 | 155Yb | |
| 71 | 156Lu | |
| 72 | 157Hf | |
| 73 | 158Ta | |
| 74 | 159W | |
| 75 | 160Re | |
| 76 | 161Os | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/xenon-139
© 1996 - 2026 ChemLin
