See also: List of individual Samarium isotopes (and general data sources).
General data
Name of the isotope:Samarium-154; Sm-154Symbol:154Sm or 15462SmMass number A:154 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:92Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4838709677419 (= neutron-proton ratio)Neutron excess (N-Z):30Isotopic mass:153.92222(2) u (atomic weight of Samarium-154)Nuclide mass:153.8882107 u (calculated nuclear mass without electrons)Mass excess:-72.4516 MeVMass defect:1.360104256 u (per nucleus)Nuclear binding energy:1266.92895384 MeV (per nucleus) 8.22681139 MeV (average binding energy per nucleon)Separation energy:SN = 7.9668(8) MeV (first neutron) SP = 9.096(9) MeV (first proton)Half-life:stableSpin and parity: (nuclear angular momentum)0+Charge radius:5.1053(67) femtometer fmYear of discovery:1933
Comparison of the natural Samarium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):
Atomic Mass ma
Quantity
Half-life
Spin
Samarium Isotopic mixture
150.36 u
100 %
Isotope 144Sm
143.91201(2) u
3.08(4) %
stable
0+
Isotope 146Sm
145.913047(3) u
[trace]
9.20 (26) × 107 years
0+
Isotope 147Sm
146.91490(2) u
15.00(14) %
1.0625(38) × 1011 years
7/2-
Isotope 148Sm
147.91483(2) u
11.25(9) %
7(3)×1015 years
0+
Isotope 149Sm
148.91719(2) u
13.82(10) %
stable
7/2-
Isotope 150Sm
149.91728(2) u
7.37(9) %
stable
0+
Isotope 152Sm
151.91974(2) u
26.74(9) %
stable
0+
Isotope 154Sm
153.92222(2) u
22.74(14) %
stable
0+
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 92) and isobaric (same nucleon number A = 154) with Samarium-154. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
