Promethium-146
Properties and data of the isotope 146Pm.
See also: list of Promethium isotopes.
General data
Name of the isotope:Promethium-146; Pm-146Symbol:146Pm or 14661PmMass number A:146 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:85Isotopic mass:145.914702(5) u (atomic weight of Promethium-146)Nuclide mass:145.8812412 u (calculated nuclear mass without electrons)Mass excess:-79.45458 MeVMass defect:1.299142812 u (per nucleus)Nuclear binding energy:1210.14373452 MeV (per nucleus)
8.28865572 MeV (average binding energy per nucleon)Separation energy:SN = 6.258(5) MeV (first neutron)
SP = 5.311(4) MeV (first proton)Half-life:5.53(5) aDecay constant λ:3.974695685302 × 10-9 s-1Specific activity α:16507708477432 Bq g-1
446.15428317384 Ci g-1Spin and parity:
(nuclear angular momentum)3-Year of discovery:1960
Radioactive Decay
Half-life T½ = 5.53(5) a respectively 1.7439 × 108 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EE | 146Nd | 65.7(15) % | 1.472(5) MeV | |
β- | 146Sm | 34.3(15) % | 1.542(3) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 146) with Promethium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 85 | Isobar A = 146 |
47 | 132Ag | |
48 | 133Cd | |
49 | 134In | |
50 | 135Sn | |
51 | 136Sb | |
52 | 137Te | |
53 | 138I | |
54 | 139Xe | 146Xe |
55 | 140Cs | 146Cs |
56 | 141Ba | 146Ba |
57 | 142La | 146La |
58 | 143Ce | 146Ce |
59 | 144Pr | 146Pr |
60 | 145Nd | 146Nd |
61 | 146Pm | 146Pm |
62 | 147Sm | 146Sm |
63 | 148Eu | 146Eu |
64 | 149Gd | 146Gd |
65 | 150Tb | 146Tb |
66 | 151Dy | 146Dy |
67 | 152Ho | 146Ho |
68 | 153Er | 146Er |
69 | 154Tm | 146Tm |
70 | 155Yb | |
71 | 156Lu | |
72 | 157Hf | |
73 | 158Ta | |
74 | 159W | |
75 | 160Re | |
76 | 161Os | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/promethium-146
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