Lanthanum-147

Properties and data of the isotope ¹⁴⁷La.

Contents

General data

Name of the isotope:Lanthanum-147; La-147Symbol:¹⁴⁷La or 14757LaMass number A:147 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:90Isotopic mass:146.928418(11) u (atomic weight of Lanthanum-147)Nuclide mass:146.8971511 u (calculated nuclear mass without electrons)Mass excess:-66.6782 MeVMass defect:1.297451264 u (per nucleus)Nuclear binding energy:1208.56806771 MeV (per nucleus)
8.22155148 MeV (average binding energy per nucleon)Separation energy:S_N = 5.70(4) MeV (first neutron)
S_P = 9.020(23) MeV (first proton)Half-life:4.06(4) sDecay constant λ:0.17072590654186 s^-1Specific activity α:7.042023682434 × 10⁺²⁰ Bq g^-1
19032496439.013 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2+)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 4.06(4) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁷Ce	99.96 %	5.336(14) MeV
β^-, n	¹⁴⁶Ce	0.041(4) %	0.886(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁷Ba.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 147) with Lanthanum-147. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 90	Isobar A = 147
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe	¹⁴⁷Xe
55	¹⁴⁵Cs	¹⁴⁷Cs
56	¹⁴⁶Ba	¹⁴⁷Ba
57	¹⁴⁷La	¹⁴⁷La
58	¹⁴⁸Ce	¹⁴⁷Ce
59	¹⁴⁹Pr	¹⁴⁷Pr
60	¹⁵⁰Nd	¹⁴⁷Nd
61	¹⁵¹Pm	¹⁴⁷Pm
62	¹⁵²Sm	¹⁴⁷Sm
63	¹⁵³Eu	¹⁴⁷Eu
64	¹⁵⁴Gd	¹⁴⁷Gd
65	¹⁵⁵Tb	¹⁴⁷Tb
66	¹⁵⁶Dy	¹⁴⁷Dy
67	¹⁵⁷Ho	¹⁴⁷Ho
68	¹⁵⁸Er	¹⁴⁷Er
69	¹⁵⁹Tm	¹⁴⁷Tm
70	¹⁶⁰Yb
71	¹⁶¹Lu
72	¹⁶²Hf
73	¹⁶³Ta
74	¹⁶⁴W
75	¹⁶⁵Re
76	¹⁶⁶Os
77	¹⁶⁷Ir
78	¹⁶⁸Pt