Cesium-124
Properties and data of the isotope 124Cs.
See also: List of individual Cesium isotopes (and general data sources).
General data
Name of the isotope:Cesium-124; Cs-124Symbol:124Cs or 12455CsMass number A:124 (= number of nucleons)Atomic number Z:55 (= number of protons)Neutrons N:69Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2545454545455 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:123.912258(9) u (atomic weight of Cesium-124)Nuclide mass:123.8820881 u (calculated nuclear mass without electrons)Mass excess:-81.73115 MeVMass defect:1.115997964 u (per nucleus)Nuclear binding energy:1039.54540748 MeV (per nucleus)
8.38343071 MeV (average binding energy per nucleon)Separation energy:SN = 8.759(15) MeV (first neutron)
SP = 3.772(13) MeV (first proton)Half-life:30.9(4) sDecay constant λ:0.022431947590937 s-1Specific activity α:1.098279253295 × 10+20 Bq g-1
2968322306.2038 Ci g-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μN) = + 0.672(3)Quadrupole moment Q:- 0.74(3) barn (100 fm2)Nuclear g-factor:gl = 0.672Charge radius:4.7828(62) femtometer fmYear of discovery:1969
Radioactive Decay
Half-life T½ = 30.9(4) s respectively 3.09 × 101 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 124Xe | 100 % | 5.93(8) MeV | |
Parent Nuclides
Direct parent isotope is: 124Ba.
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 |
|---|
| 124mCs | 462.63(14) keV | 6.3(2) s | (7)+ |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 69) and isobaric (same nucleon number A = 124) with Cesium-124. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 69 | Isobar A = 124 |
|---|
| 38 | 107Sr | |
| 39 | 108Y | |
| 40 | 109Zr | |
| 41 | 110Nb | |
| 42 | 111Mo | |
| 43 | 112Tc | |
| 44 | 113Ru | 124Ru |
| 45 | 114Rh | 124Rh |
| 46 | 115Pd | 124Pd |
| 47 | 116Ag | 124Ag |
| 48 | 117Cd | 124Cd |
| 49 | 118In | 124In |
| 50 | 119Sn | 124Sn |
| 51 | 120Sb | 124Sb |
| 52 | 121Te | 124Te |
| 53 | 122I | 124I |
| 54 | 123Xe | 124Xe |
| 55 | 124Cs | 124Cs |
| 56 | 125Ba | 124Ba |
| 57 | 126La | 124La |
| 58 | 127Ce | 124Ce |
| 59 | 128Pr | 124Pr |
| 60 | 129Nd | 124Nd |
| 61 | 130Pm | |
| 62 | 131Sm | |
| 63 | 132Eu | |
External data and identifiers
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/cesium-124
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