See also: List of individual Samarium isotopes (and general data sources).
General data
Name of the isotope:Samarium-141m; Sm-141mSymbol:141mSm or 141m62SmMass number A:141 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:79Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2741935483871 (= neutron-proton ratio)Neutron excess (N-Z):17Excitation energy:175.9(3) keVIsotopic mass:140.918482(9) u (atomic weight of Samarium-141m)Nuclide mass:140.8844727 u (calculated nuclear mass without electrons)Mass excess:-75.93353 MeVMass defect:1.251198348 u (per nucleus)Nuclear binding energy:1165.48375397 MeV (per nucleus) 8.26584223 MeV (average binding energy per nucleon)Half-life:22.6(2) minDecay constant λ:0.0005111704871386 s-1Specific activity α:2.184483243231 × 10+18 Bq g-1 59040087.654911 Ci g-1Spin and parity: (nuclear angular momentum)11/2-Magnetic dipole moment:μ(μN) = +0.84(2)Quadrupole moment Q:+1.6(5) barn (100 fm2)Nuclear g-factor:gl = 0.15272727272727
Radioactive Decay
Half-life T½ = 22.6(2) min (minutes) respectively 1.356 × 103 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
141Pm
99.69(3) %
Iso
141Sm
0.31(3) %
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 = 141) with Samarium-141m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
