See also: List of individual Xenon isotopes (and general data sources).
General data
Name of the isotope:Xenon-133; Xe-133Other names:XeneisolSymbol:133Xe or 13354XeMass number A:133 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.462962962963 (= neutron-proton ratio)Neutron excess (N-Z):25Isotopic mass:132.9059107(26) u (atomic weight of Xenon-133)Nuclide mass:132.8762893 u (calculated nuclear mass without electrons)Mass excess:-87.64362 MeVMass defect:1.201169392 u (per nucleus)Nuclear binding energy:1118.88208163 MeV (per nucleus) 8.41264723 MeV (average binding energy per nucleon)Separation energy:SN = 6.4359(24) MeV (first neutron) SP = 9.229(5) MeV (first proton)Half-life:5.2475(5) dDecay constant λ:1.5288302643233 × 10-6 s-1Specific activity α:6.9273300197196 × 10+15 Bq g-1 187225.1356681 Ci g-1Spin and parity: (nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = +0.81335(7)Quadrupole moment Q:+0.140(5) barn (100 fm2)Nuclear g-factor:gl = 0.54223333333333Charge radius:4.7831(47) femtometer fmYear of discovery:1940
Radioactive Decay
Half-life T½ = 5.2475(5) d respectively 4.53384 × 105 seconds s.
The chemically inert noble gas isotope xenon-133 is one of the radiopharmaceuticals approved for medical applications and can be used as a radiodiagnostic for the respiratory tract (ATC code V09EX03).
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 133) with Xenon-133. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
