Samarium-145
Properties and data of the isotope 145Sm.
See also: list of Samarium isotopes.
General data
Name of the isotope:Samarium-145; Sm-145Symbol:145Sm or 14562SmMass number A:145 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:83Isotopic mass:144.9134172(17) u (atomic weight of Samarium-145)Nuclide mass:144.8794079 u (calculated nuclear mass without electrons)Mass excess:-80.65136 MeVMass defect:1.290922812 u (per nucleus)Nuclear binding energy:1202.48685384 MeV (per nucleus)
8.29301279 MeV (average binding energy per nucleon)Separation energy:SN = 6.7571(3) MeV (first neutron)
SP = 6.5242(27) MeV (first proton)Half-life:340(3) dDecay constant λ:2.359248402178 × 10-8 s-1Specific activity α:98664765288178 Bq g-1
2666.6152780589 Ci g-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = - 1.12Quadrupole moment Q:0.60(17) barn (100 fm2)Nuclear g-factor:gl = -0.32Charge radius:4.9651(34) femtometer fmYear of discovery:1947
Radioactive Decay
Half-life T½ = 340(3) d respectively 2.938 × 107 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE | 145Pm | 100 % | 0.616(3) MeV | |
Parent Nuclides
Direct parent isotopes are: 145Eu, 149Gd.
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 |
|---|
| 145mSm | 8786.2(7) keV | 0.96 μs | (49/2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 83) and isobaric (same nucleon number A = 145) with Samarium-145. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 83 | Isobar A = 145 |
|---|
| 46 | 129Pd | |
| 47 | 130Ag | |
| 48 | 131Cd | |
| 49 | 132In | |
| 50 | 133Sn | |
| 51 | 134Sb | |
| 52 | 135Te | |
| 53 | 136I | 145I |
| 54 | 137Xe | 145Xe |
| 55 | 138Cs | 145Cs |
| 56 | 139Ba | 145Ba |
| 57 | 140La | 145La |
| 58 | 141Ce | 145Ce |
| 59 | 142Pr | 145Pr |
| 60 | 143Nd | 145Nd |
| 61 | 144Pm | 145Pm |
| 62 | 145Sm | 145Sm |
| 63 | 146Eu | 145Eu |
| 64 | 147Gd | 145Gd |
| 65 | 148Tb | 145Tb |
| 66 | 149Dy | 145Dy |
| 67 | 150Ho | 145Ho |
| 68 | 151Er | 145Er |
| 69 | 152Tm | 145Tm |
| 70 | 153Yb | |
| 71 | 154Lu | |
| 72 | 155Hf | |
| 73 | 156Ta | |
| 74 | 157W | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/samarium-145
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