Lanthanum-156
Properties and data of the isotope 156La.
See also: list of Lanthanum isotopes.
General data
Name of the isotope:Lanthanum-156; La-156Symbol:156La or 15657LaMass number A:156 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:99Isotopic mass:155.96452(43) u (atomic weight of Lanthanum-156)Nuclide mass:155.9332531 u (calculated nuclear mass without electrons)Mass excess:-33.04941 MeVMass defect:1.339333508 u (per nucleus)Nuclear binding energy:1247.5811267 MeV (per nucleus)
7.99731491 MeV (average binding energy per nucleon)Separation energy:SN = 3.19(56) MeV (first neutron)Half-life:84(78) msDecay constant λ:8.2517521495232 s-1Specific activity α:3.206013792626 × 10+22 Bq g-1
866490214223.43 Ci g-1Spin and parity:
(nuclear angular momentum)(4+)Year of discovery:2016
Radioactive Decay
Half-life T½ = 84(78) ms respectively 8.4 × 10-2 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| β- | 156Ce | 100 % | 11.77(50) MeV | |
| β-, n | 155Ce | ? | 6.66(50) MeV | |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 156) with Lanthanum-156. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 99 | Isobar A = 156 |
|---|
| 57 | 156La | 156La |
| 58 | 157Ce | 156Ce |
| 59 | 158Pr | 156Pr |
| 60 | 159Nd | 156Nd |
| 61 | 160Pm | 156Pm |
| 62 | 161Sm | 156Sm |
| 63 | 162Eu | 156Eu |
| 64 | 163Gd | 156Gd |
| 65 | 164Tb | 156Tb |
| 66 | 165Dy | 156Dy |
| 67 | 166Ho | 156Ho |
| 68 | 167Er | 156Er |
| 69 | 168Tm | 156Tm |
| 70 | 169Yb | 156Yb |
| 71 | 170Lu | 156Lu |
| 72 | 171Hf | 156Hf |
| 73 | 172Ta | 156Ta |
| 74 | 173W | 156W |
| 75 | 174Re | |
| 76 | 175Os | |
| 77 | 176Ir | |
| 78 | 177Pt | |
| 79 | 178Au | |
| 80 | 179Hg | |
| 81 | 180Tl | |
| 82 | 181Pb | |
Literature and References
[1] - M. Thoennessen:
2017 Update of the discoveries of nuclides.
In: International Journal of Modern Physics E, (2018), DOI 10.1142/S0218301318300023.
Last update: 2020-10-19
Perma link: https://www.chemlin.org/isotope/lanthanum-156
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