See also: List of individual Promethium isotopes (and general data sources).
General data
Name of the isotope:Promethium-141m1; Pm-141m1Symbol:141m1Pm or 141m161PmMass number A:141 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:80Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.3114754098361 (= neutron-proton ratio)Neutron excess (N-Z):19Excitation energy:628.62(7) keVIsotopic mass:140.913555(15) u (atomic weight of Promethium-141m1)Nuclide mass:140.8800942 u (calculated nuclear mass without electrons)Mass excess:-80.523 MeVMass defect:1.256965232 u (per nucleus)Nuclear binding energy:1170.85557182 MeV (per nucleus) 8.30394023 MeV (average binding energy per nucleon)Half-life:0.63(2) μsDecay constant λ:1100233.6199364 s-1Specific activity α:4.702004521950 × 10+27 Bq g-1 1.270812032959 × 10+17 Ci g-1Spin and parity: (nuclear angular momentum)11/2-
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 = 141) with Promethium-141m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
