Lanthanum-143

Properties and data of the isotope ¹⁴³La.

Content

General data

Name of the isotope:Lanthanum-143; La-143Symbol:¹⁴³La or 14357LaMass number A:143 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:86Isotopic mass:142.916079(8) u (atomic weight of Lanthanum-143)Nuclide mass:142.8848121 u (calculated nuclear mass without electrons)Mass excess:-78.17191 MeVMass defect:1.2751306 u (per nucleus)Nuclear binding energy:1187.77650312 MeV (per nucleus)
8.30612939 MeV (average binding energy per nucleon)Separation energy:S_N = 6.219(10) MeV (first neutron)
S_P = 7.618(9) MeV (first proton)Half-life:14.2(1) minDecay constant λ:0.00081355302882623 s^-1Specific activity α:3.450233053957 × 10⁺¹⁸ Bq g^-1
93249541.998851 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2)+Year of discovery:1951

Radioactive Decay

Half-life T_½ = 14.2(1) min (minutes) respectively 8.52 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴³Ce	100 %	3.435(8) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴³Ba.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 86) and isobaric (same nucleon number A = 143) with Lanthanum-143. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 86	Isobar A = 143
48	¹³⁴Cd
49	¹³⁵In
50	¹³⁶Sn
51	¹³⁷Sb
52	¹³⁸Te	¹⁴³Te
53	¹³⁹I	¹⁴³I
54	¹⁴⁰Xe	¹⁴³Xe
55	¹⁴¹Cs	¹⁴³Cs
56	¹⁴²Ba	¹⁴³Ba
57	¹⁴³La	¹⁴³La
58	¹⁴⁴Ce	¹⁴³Ce
59	¹⁴⁵Pr	¹⁴³Pr
60	¹⁴⁶Nd	¹⁴³Nd
61	¹⁴⁷Pm	¹⁴³Pm
62	¹⁴⁸Sm	¹⁴³Sm
63	¹⁴⁹Eu	¹⁴³Eu
64	¹⁵⁰Gd	¹⁴³Gd
65	¹⁵¹Tb	¹⁴³Tb
66	¹⁵²Dy	¹⁴³Dy
67	¹⁵³Ho	¹⁴³Ho
68	¹⁵⁴Er	¹⁴³Er
69	¹⁵⁵Tm
70	¹⁵⁶Yb
71	¹⁵⁷Lu
72	¹⁵⁸Hf
73	¹⁵⁹Ta
74	¹⁶⁰W
75	¹⁶¹Re
76	¹⁶²Os