Lanthanum-119

Properties and data of the isotope ¹¹⁹La.

Contents

General data

Name of the isotope:Lanthanum-119; La-119Symbol:¹¹⁹La or 11957LaMass number A:119 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:62Isotopic mass:118.94099(43) u (atomic weight of Lanthanum-119)Nuclide mass:118.9097231 u (calculated nuclear mass without electrons)Mass excess:-54.96746 MeVMass defect:1.042261616 u (per nucleus)Nuclear binding energy:970.86044173 MeV (per nucleus)
8.15849111 MeV (average binding energy per nucleon)Half-life:~1 sDecay constant λ:0.69314718055995 s^-1Specific activity α:3.537483015254 × 10⁺²¹ Bq g^-1
95607649060.924 Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-~

Radioactive Decay

Half-life T_½ = ~1 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹¹⁹Ba

Parent Nuclides

Direct parent isotope is: ¹¹⁹Ce.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 62) and isobaric (same nucleon number A = 119) with Lanthanum-119. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 62	Isobar A = 119
35	⁹⁷Br
36	⁹⁸Kr
37	⁹⁹Rb
38	¹⁰⁰Sr
39	¹⁰¹Y
40	¹⁰²Zr
41	¹⁰³Nb
42	¹⁰⁴Mo
43	¹⁰⁵Tc	¹¹⁹Tc
44	¹⁰⁶Ru	¹¹⁹Ru
45	¹⁰⁷Rh	¹¹⁹Rh
46	¹⁰⁸Pd	¹¹⁹Pd
47	¹⁰⁹Ag	¹¹⁹Ag
48	¹¹⁰Cd	¹¹⁹Cd
49	¹¹¹In	¹¹⁹In
50	¹¹²Sn	¹¹⁹Sn
51	¹¹³Sb	¹¹⁹Sb
52	¹¹⁴Te	¹¹⁹Te
53	¹¹⁵I	¹¹⁹I
54	¹¹⁶Xe	¹¹⁹Xe
55	¹¹⁷Cs	¹¹⁹Cs
56	¹¹⁸Ba	¹¹⁹Ba
57	¹¹⁹La	¹¹⁹La
58	¹²⁰Ce	¹¹⁹Ce
59	¹²¹Pr