Antimony-131
Properties and data of the isotope 131Sb.
See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-131; Sb-131Symbol:131Sb or 13151SbMass number A:131 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:80Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.5686274509804 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:130.9119893(22) u (atomic weight of Antimony-131)Nuclide mass:130.8840134 u (calculated nuclear mass without electrons)Mass excess:-81.98144 MeVMass defect:1.180280612 u (per nucleus)Nuclear binding energy:1099.42430839 MeV (per nucleus)
8.39255197 MeV (average binding energy per nucleon)Separation energy:SN = 7.767(14) MeV (first neutron)
SP = 9.1382(28) MeV (first proton)Half-life:23.03(4) minDecay constant λ:0.00050162627048773 s-1Specific activity α:2.323741584555 × 10+18 Bq g-1
62803826.609603 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2+)Magnetic dipole moment:μ(μN) = 2.89(4)Nuclear g-factor:gl = 0.82571428571429Year of discovery:1956
Radioactive Decay
Half-life T½ = 23.03(4) min (minutes) respectively 1.3818 × 103 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 131Te | 100 % | 3.2296(21) MeV | |
Parent Nuclides
Direct parent isotope is: 131Sn.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
| Nuclear Isomer | Excitation Energy | Half-life | Spin |
|---|
| 131m1Sb | 1676.06(6) keV | 91(4) μs | (15/2-) |
| 131m2Sb | 1687.2(9) keV | 4.3(8) μs | (19/2-) |
| 131m3Sb | 2165.6(15) keV | 1.1(2) μs | (23/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 131) with Antimony-131. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 80 | Isobar A = 131 |
|---|
| 44 | 124Ru | |
| 45 | 125Rh | |
| 46 | 126Pd | |
| 47 | 127Ag | 131Ag |
| 48 | 128Cd | 131Cd |
| 49 | 129In | 131In |
| 50 | 130Sn | 131Sn |
| 51 | 131Sb | 131Sb |
| 52 | 132Te | 131Te |
| 53 | 133I | 131I |
| 54 | 134Xe | 131Xe |
| 55 | 135Cs | 131Cs |
| 56 | 136Ba | 131Ba |
| 57 | 137La | 131La |
| 58 | 138Ce | 131Ce |
| 59 | 139Pr | 131Pr |
| 60 | 140Nd | 131Nd |
| 61 | 141Pm | 131Pm |
| 62 | 142Sm | 131Sm |
| 63 | 143Eu | 131Eu |
| 64 | 144Gd | |
| 65 | 145Tb | |
| 66 | 146Dy | |
| 67 | 147Ho | |
| 68 | 148Er | |
| 69 | 149Tm | |
| 70 | 150Yb | |
| 71 | 151Lu | |
External data and identifiers
Last update: 2020-10-17
Perma link: https://www.chemlin.org/isotope/antimony-131
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