See also: List of individual Xenon isotopes (and general data sources).
General data
Name of the isotope:Xenon-134m; Xe-134mSymbol:134mXe or 134m54XeMass number A:134 (= number of nucleons)Atomic number Z:54 (= number of protons)Neutrons N:80Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4814814814815 (= neutron-proton ratio)Neutron excess (N-Z):26Excitation energy:1965.5(5) keVIsotopic mass:133.905393033(10) u (atomic weight of Xenon-134m)Nuclide mass:133.8757716 u (calculated nuclear mass without electrons)Mass excess:-88.12582 MeVMass defect:1.210351975 u (per nucleus)Nuclear binding energy:1127.4356026 MeV (per nucleus) 8.41369853 MeV (average binding energy per nucleon)Half-life:290(17) msDecay constant λ:2.390162691586 s-1Specific activity α:1.074930280402 × 10+22 Bq g-1 290521697405.97 Ci g-1Spin and parity: (nuclear angular momentum)7-
Radioactive Decay
Half-life T½ = 290(17) ms respectively 2.9 × 10-1 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
Iso
134Xe
100 %
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 = 80) and isobaric (same nucleon number A = 134) with Xenon-134m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
