About   |   More   |   Search
ChemLin Logo

Lanthanum-139

Properties and data of the isotope 139La.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Lanthanum isotopes.

 

General data

Name of the isotope:Lanthanum-139; La-139Symbol:139La or 13957LaMass number A:139 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:82Isotopic mass:138.90636(2) u (atomic weight of Lanthanum-139)Nuclide mass:138.8750931 u (calculated nuclear mass without electrons)Mass excess:-87.2251 MeVMass defect:1.250189936 u (per nucleus)Nuclear binding energy:1164.54442424 MeV (per nucleus)
8.37801744 MeV (average binding energy per nucleon)Separation energy:SN = 8.7783(25) MeV (first neutron)
SP = 6.2535(20) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2+Magnetic dipole moment:μ(μN) = +2.7791(2)Charge radius:4.8550(49) femtometer fmYear of discovery:1924

 

Parent Nuclides

Direct parent isotopes are: 139Ce, 139Ba.

 

Occurrence

Comparison of the natural Lanthanum isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Lanthanum
Isotopic mixture		138.90547 u100 %
Isotope 138La137.907118(3) u0.08881(71) %1.02(1) × 1011 a5+
Isotope 139La138.90636(2) u99.91119(71) %stable7/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 139La

Isotope:139La-NMRQuantity:99.91119(71) %Spin:7/2+Nuclearmagnetic moment
μ/μN:+2.7791(2)Gyromagnetic ratio γ:3.801 · 107 rad T-1 s-1Nuclear g-factor:gl = 0.79402857142857Quadrupole moment Q:+ 0.206(4) barn (100 fm2)Resonance frequency:v0 = 6.0612 at 1 TRelative Sensitivity:0.06058 (H0 = const.)
2.9895 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 82) and isobaric (same nucleon number A = 139) with Lanthanum-139. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 82Isobar A = 139
45127Rh
46128Pd
47129Ag
48130Cd
49131In
50132Sn139Sn
51133Sb139Sb
52134Te139Te
53135I139I
54136Xe139Xe
55137Cs139Cs
56138Ba139Ba
57139La139La
58140Ce139Ce
59141Pr139Pr
60142Nd139Nd
61143Pm139Pm
62144Sm139Sm
63145Eu139Eu
64146Gd139Gd
65147Tb139Tb
66148Dy139Dy
67149Ho
68150Er
69151Tm
70152Yb
71153Lu
72154Hf
73155Ta
74156W

 

External data and identifiers

Adopted Levels, Gammas:NuDat 139La

 

More Chemistry

isotopes

Social Media

Facebook

LinkedIn

Twitter

About ChemLin

home

about

contact, imprint

cookie and privacy policy

terms of use

Last update: 2020-10-19

© 1996 - 2024 ChemLin