Samarium-143
Properties and data of the isotope 143Sm.
See also: list of Samarium isotopes.
General data
Name of the isotope:Samarium-143; Sm-143Symbol:143Sm or 14362SmMass number A:143 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:81Isotopic mass:142.914635(3) u (atomic weight of Samarium-143)Nuclide mass:142.8806257 u (calculated nuclear mass without electrons)Mass excess:-79.51699 MeVMass defect:1.27237518 u (per nucleus)Nuclear binding energy:1185.20984592 MeV (per nucleus)
8.28818074 MeV (average binding energy per nucleon)Separation energy:SN = 8.602(4) MeV (first neutron)
SP = 5.664(24) MeV (first proton)Half-life:8.75(6) minDecay constant λ:0.0013202803439237 s-1Specific activity α:5.599235356136 × 10+18 Bq g-1
151330685.30099 Ci g-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = +1.01(2)Quadrupole moment Q:0.41(21) barn (100 fm2)Nuclear g-factor:gl = 0.67333333333333Charge radius:4.9479(34) femtometer fmYear of discovery:1956
Radioactive Decay
Half-life T½ = 8.75(6) min (minutes) respectively 5.25 × 102 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EE/β+ | 143Pm | 100 % | 3.443(4) MeV | |
Parent Nuclides
Direct parent isotope is: 143Eu.
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
143m1Sm | 753.99(16) keV | 66(2) s | 11/2- |
143m2Sm | 2793.8(13) keV | 30(3) ms | 23/2(-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 81) and isobaric (same nucleon number A = 143) with Samarium-143. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 81 | Isobar A = 143 |
45 | 126Rh | |
46 | 127Pd | |
47 | 128Ag | |
48 | 129Cd | |
49 | 130In | |
50 | 131Sn | |
51 | 132Sb | |
52 | 133Te | 143Te |
53 | 134I | 143I |
54 | 135Xe | 143Xe |
55 | 136Cs | 143Cs |
56 | 137Ba | 143Ba |
57 | 138La | 143La |
58 | 139Ce | 143Ce |
59 | 140Pr | 143Pr |
60 | 141Nd | 143Nd |
61 | 142Pm | 143Pm |
62 | 143Sm | 143Sm |
63 | 144Eu | 143Eu |
64 | 145Gd | 143Gd |
65 | 146Tb | 143Tb |
66 | 147Dy | 143Dy |
67 | 148Ho | 143Ho |
68 | 149Er | 143Er |
69 | 150Tm | |
70 | 151Yb | |
71 | 152Lu | |
72 | 153Hf | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/samarium-143
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