Lanthanum-145

Properties and data of the isotope ¹⁴⁵La.

Contents

General data

Name of the isotope:Lanthanum-145; La-145Symbol:¹⁴⁵La or 14557LaMass number A:145 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:88Isotopic mass:144.921808(13) u (atomic weight of Lanthanum-145)Nuclide mass:144.8905411 u (calculated nuclear mass without electrons)Mass excess:-72.83538 MeVMass defect:1.286731432 u (per nucleus)Nuclear binding energy:1198.58260852 MeV (per nucleus)
8.26608696 MeV (average binding energy per nucleon)Separation energy:S_N = 6.057(18) MeV (first neutron)
S_P = 8.357(14) MeV (first proton)Half-life:24.8(20) sDecay constant λ:0.027949483087095 s^-1Specific activity α:1.168859195228 × 10⁺²⁰ Bq g^-1
3159078906.023 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2+)Year of discovery:1974

Radioactive Decay

Half-life T_½ = 24.8(20) s respectively 2.48 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴⁵Ce	100 %	4.23(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁵Ba.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 145) with Lanthanum-145. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 88	Isobar A = 145
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te
53	¹⁴¹I	¹⁴⁵I
54	¹⁴²Xe	¹⁴⁵Xe
55	¹⁴³Cs	¹⁴⁵Cs
56	¹⁴⁴Ba	¹⁴⁵Ba
57	¹⁴⁵La	¹⁴⁵La
58	¹⁴⁶Ce	¹⁴⁵Ce
59	¹⁴⁷Pr	¹⁴⁵Pr
60	¹⁴⁸Nd	¹⁴⁵Nd
61	¹⁴⁹Pm	¹⁴⁵Pm
62	¹⁵⁰Sm	¹⁴⁵Sm
63	¹⁵¹Eu	¹⁴⁵Eu
64	¹⁵²Gd	¹⁴⁵Gd
65	¹⁵³Tb	¹⁴⁵Tb
66	¹⁵⁴Dy	¹⁴⁵Dy
67	¹⁵⁵Ho	¹⁴⁵Ho
68	¹⁵⁶Er	¹⁴⁵Er
69	¹⁵⁷Tm	¹⁴⁵Tm
70	¹⁵⁸Yb
71	¹⁵⁹Lu
72	¹⁶⁰Hf
73	¹⁶¹Ta
74	¹⁶²W
75	¹⁶³Re
76	¹⁶⁴Os
77	¹⁶⁵Ir
78	¹⁶⁶Pt