Cesium-134
Properties and data of the isotope 134Cs.
See also: List of individual Cesium isotopes (and general data sources).
General data
Name of the isotope:Cesium-134; Cs-134Symbol:134Cs or 13455CsMass number A:134 (= number of nucleons)Atomic number Z:55 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4363636363636 (= neutron-proton ratio)Neutron excess (N-Z):24Isotopic mass:133.906718503(17) u (atomic weight of Cesium-134)Nuclide mass:133.8765486 u (calculated nuclear mass without electrons)Mass excess:-86.89115 MeVMass defect:1.208186621 u (per nucleus)Nuclear binding energy:1125.41858834 MeV (per nucleus)
8.39864618 MeV (average binding energy per nucleon)Separation energy:SN = 6.89154(1) MeV (first neutron)
SP = 6.5365(24) MeV (first proton)Half-life:2.0652(4) aDecay constant λ:1.064282050633 × 10-8 s-1Specific activity α:48189897921947 Bq g-1
1302.4296735661 Ci g-1Spin and parity:
(nuclear angular momentum)4+Magnetic dipole moment:μ(μN) = +2.9893(14)Quadrupole moment Q:+ 0.389(3) barn (100 fm2)Nuclear g-factor:gl = 0.747325Charge radius:4.8031(46) femtometer fmYear of discovery:1940
Radioactive Decay
Half-life T½ = 2.0652(4) a respectively 6.51281472 × 107 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 134Ba | 99.9997(1) % | 2.0587(3) MeV | |
| EC | 134Xe | 0.0003(1) % | 1.234668(18) MeV | |
Parent Nuclides
Direct parent isotopes are: 134Ba, 134Xe.
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 |
|---|
| 134mCs | 138.7441(26) keV | 2.912(2) h | 8- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 134) with Cesium-134. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 79 | Isobar A = 134 |
|---|
| 44 | 123Ru | |
| 45 | 124Rh | |
| 46 | 125Pd | |
| 47 | 126Ag | |
| 48 | 127Cd | 134Cd |
| 49 | 128In | 134In |
| 50 | 129Sn | 134Sn |
| 51 | 130Sb | 134Sb |
| 52 | 131Te | 134Te |
| 53 | 132I | 134I |
| 54 | 133Xe | 134Xe |
| 55 | 134Cs | 134Cs |
| 56 | 135Ba | 134Ba |
| 57 | 136La | 134La |
| 58 | 137Ce | 134Ce |
| 59 | 138Pr | 134Pr |
| 60 | 139Nd | 134Nd |
| 61 | 140Pm | 134Pm |
| 62 | 141Sm | 134Sm |
| 63 | 142Eu | 134Eu |
| 64 | 143Gd | 134Gd |
| 65 | 144Tb | |
| 66 | 145Dy | |
| 67 | 146Ho | |
| 68 | 147Er | |
| 69 | 148Tm | |
| 70 | 149Yb | |
| 71 | 150Lu | |
External data and identifiers
CAS:13967-70-9InChI Key:TVFDJXOCXUVLDH-OUBTZVSYSA-NSMILES:[134Cs]PubChem:ID 6335485Adopted Levels, Gammas:NuDat 134Cs
Last update: 2020-11-26
Perma link: https://www.chemlin.org/isotope/cesium-134
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