Promethium-148
Properties and data of the isotope 148Pm.
See also: List of individual Promethium isotopes (and general data sources).
General data
Name of the isotope:Promethium-148; Pm-148Symbol:148Pm or 14861PmMass number A:148 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:87Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4262295081967 (= neutron-proton ratio)Neutron excess (N-Z):26Isotopic mass:147.917481(6) u (atomic weight of Promethium-148)Nuclide mass:147.8840202 u (calculated nuclear mass without electrons)Mass excess:-76.86595 MeVMass defect:1.313693644 u (per nucleus)Nuclear binding energy:1223.69774722 MeV (per nucleus)
8.26822802 MeV (average binding energy per nucleon)Separation energy:SN = 5.895(6) MeV (first neutron)
SP = 6.008(6) MeV (first proton)Half-life:5.368(7) dDecay constant λ:1.494511328620 × 10-6 s-1Specific activity α:6.122556284167 × 10+15 Bq g-1
165474.49416668 Ci g-1Spin and parity:
(nuclear angular momentum)1-Magnetic dipole moment:μ(μN) = 1.84(19)Quadrupole moment Q:+0.20 barn (100 fm2)Nuclear g-factor:gl = 1.84Year of discovery:1947
Radioactive Decay
Half-life T½ = 5.368(7) d respectively 4.637952 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 148Sm | 100 % | 2.471(6) MeV | |
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 |
|---|
| 148m2Pm | 137.9(3) keV | 41.29(11) d | 5-,6- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 148) with Promethium-148. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 87 | Isobar A = 148 |
|---|
| 49 | 136In | |
| 50 | 137Sn | |
| 51 | 138Sb | |
| 52 | 139Te | |
| 53 | 140I | |
| 54 | 141Xe | 148Xe |
| 55 | 142Cs | 148Cs |
| 56 | 143Ba | 148Ba |
| 57 | 144La | 148La |
| 58 | 145Ce | 148Ce |
| 59 | 146Pr | 148Pr |
| 60 | 147Nd | 148Nd |
| 61 | 148Pm | 148Pm |
| 62 | 149Sm | 148Sm |
| 63 | 150Eu | 148Eu |
| 64 | 151Gd | 148Gd |
| 65 | 152Tb | 148Tb |
| 66 | 153Dy | 148Dy |
| 67 | 154Ho | 148Ho |
| 68 | 155Er | 148Er |
| 69 | 156Tm | 148Tm |
| 70 | 157Yb | 148Yb |
| 71 | 158Lu | |
| 72 | 159Hf | |
| 73 | 160Ta | |
| 74 | 161W | |
| 75 | 162Re | |
| 76 | 163Os | |
| 77 | 164Ir | |
| 78 | 165Pt | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/promethium-148
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