Samarium-153
Properties and data of the isotope 153Sm.
See also: list of Samarium isotopes.
General data
Name of the isotope:Samarium-153; Sm-153Symbol:153Sm or 15362SmMass number A:153 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:91Isotopic mass:152.9221036(11) u (atomic weight of Samarium-153)Nuclide mass:152.8880943 u (calculated nuclear mass without electrons)Mass excess:-72.56003 MeVMass defect:1.35155574 u (per nucleus)Nuclear binding energy:1258.96606248 MeV (per nucleus)
8.22853636 MeV (average binding energy per nucleon)Separation energy:SN = 5.86840(13) MeV (first neutron)
SP = 8.594(26) MeV (first proton)Half-life:46.284(4) hDecay constant λ:4.159987976166 × 10-6 s-1Specific activity α:1.648160103165 × 10+16 Bq g-1
445448.67653122 Ci g-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μN) = - 0.00216(1)Quadrupole moment Q:+1.30(12) barn (100 fm2)Nuclear g-factor:gl = -0.00144Charge radius:5.0925(68) femtometer fmYear of discovery:1938
Radioactive Decay
Half-life T½ = 46.284(4) h (hours) respectively 1.666224 × 105 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 153Eu | 100 % | 0.8074(7) MeV | 0.10318012(17) MeV
29.14(16) % |
Parent Nuclides
Direct parent isotope is: 153Pm.
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 |
|---|
| 153mSm | 98.39(10) keV | 10.6(3) ms | 11/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 153) with Samarium-153. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 91 | Isobar A = 153 |
|---|
| 52 | 143Te | |
| 53 | 144I | |
| 54 | 145Xe | |
| 55 | 146Cs | |
| 56 | 147Ba | 153Ba |
| 57 | 148La | 153La |
| 58 | 149Ce | 153Ce |
| 59 | 150Pr | 153Pr |
| 60 | 151Nd | 153Nd |
| 61 | 152Pm | 153Pm |
| 62 | 153Sm | 153Sm |
| 63 | 154Eu | 153Eu |
| 64 | 155Gd | 153Gd |
| 65 | 156Tb | 153Tb |
| 66 | 157Dy | 153Dy |
| 67 | 158Ho | 153Ho |
| 68 | 159Er | 153Er |
| 69 | 160Tm | 153Tm |
| 70 | 161Yb | 153Yb |
| 71 | 162Lu | 153Lu |
| 72 | 163Hf | 153Hf |
| 73 | 164Ta | |
| 74 | 165W | |
| 75 | 166Re | |
| 76 | 167Os | |
| 77 | 168Ir | |
| 78 | 169Pt | |
| 79 | 170Au | |
| 80 | 171Hg | |
External data and identifiers
Last update: 2023-05-24
Perma link: https://www.chemlin.org/isotope/samarium-153
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