Lanthanum-148
Properties and data of the isotope 148La.
See also: list of Lanthanum isotopes.
General data
Name of the isotope:Lanthanum-148; La-148Symbol:148La or 14857LaMass number A:148 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:91Isotopic mass:147.932679(21) u (atomic weight of Lanthanum-148)Nuclide mass:147.9014121 u (calculated nuclear mass without electrons)Mass excess:-62.70911 MeVMass defect:1.30185518 u (per nucleus)Nuclear binding energy:1212.67028904 MeV (per nucleus)
8.19371817 MeV (average binding energy per nucleon)Separation energy:SN = 4.102(22) MeV (first neutron)
SP = 9.734(28) MeV (first proton)Half-life:1.26(8) sDecay constant λ:0.55011680996821 s-1Specific activity α:2.25366048914 × 10+21 Bq g-1
60909742949.946 Ci g-1Spin and parity:
(nuclear angular momentum)(2-)Year of discovery:1982
Radioactive Decay
Half-life T½ = 1.26(8) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 148Ce | 99.85 % | 7.690(22) MeV | |
β-, n | 147Ce | 0.15(3) % | 1.234(21) MeV | |
Parent Nuclides
Direct parent isotope is: 148Ba.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 148) with Lanthanum-148. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 91 | Isobar A = 148 |
52 | 143Te | |
53 | 144I | |
54 | 145Xe | 148Xe |
55 | 146Cs | 148Cs |
56 | 147Ba | 148Ba |
57 | 148La | 148La |
58 | 149Ce | 148Ce |
59 | 150Pr | 148Pr |
60 | 151Nd | 148Nd |
61 | 152Pm | 148Pm |
62 | 153Sm | 148Sm |
63 | 154Eu | 148Eu |
64 | 155Gd | 148Gd |
65 | 156Tb | 148Tb |
66 | 157Dy | 148Dy |
67 | 158Ho | 148Ho |
68 | 159Er | 148Er |
69 | 160Tm | 148Tm |
70 | 161Yb | 148Yb |
71 | 162Lu | |
72 | 163Hf | |
73 | 164Ta | |
74 | 165W | |
75 | 166Re | |
76 | 167Os | |
77 | 168Ir | |
78 | 169Pt | |
79 | 170Au | |
80 | 171Hg | |
External data and identifiers
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/lanthanum-148
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