Lanthanum-134

Properties and data of the isotope ¹³⁴La.

Content

General data

Name of the isotope:Lanthanum-134; La-134Symbol:¹³⁴La or 13457LaMass number A:134 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:77Isotopic mass:133.908514(21) u (atomic weight of Lanthanum-134)Nuclide mass:133.8772471 u (calculated nuclear mass without electrons)Mass excess:-85.21866 MeVMass defect:1.204711356 u (per nucleus)Nuclear binding energy:1122.18139985 MeV (per nucleus)
8.37448806 MeV (average binding energy per nucleon)Separation energy:S_N = 7.80(3) MeV (first neutron)
S_P = 4.954(20) MeV (first proton)Half-life:6.45(16) minDecay constant λ:0.001791077985943 s^-1Specific activity α:8.109867610887 × 10⁺¹⁸ Bq g^-1
219185611.10507 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Year of discovery:1951

Radioactive Decay

Half-life T_½ = 6.45(16) min (minutes) respectively 3.87 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹³⁴Ba	100 %	3.731(20) MeV

Parent Nuclides

Direct parent isotope is: ¹³⁴Ce.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 134) with Lanthanum-134. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 77	Isobar A = 134
43	¹²⁰Tc
44	¹²¹Ru
45	¹²²Rh
46	¹²³Pd
47	¹²⁴Ag
48	¹²⁵Cd	¹³⁴Cd
49	¹²⁶In	¹³⁴In
50	¹²⁷Sn	¹³⁴Sn
51	¹²⁸Sb	¹³⁴Sb
52	¹²⁹Te	¹³⁴Te
53	¹³⁰I	¹³⁴I
54	¹³¹Xe	¹³⁴Xe
55	¹³²Cs	¹³⁴Cs
56	¹³³Ba	¹³⁴Ba
57	¹³⁴La	¹³⁴La
58	¹³⁵Ce	¹³⁴Ce
59	¹³⁶Pr	¹³⁴Pr
60	¹³⁷Nd	¹³⁴Nd
61	¹³⁸Pm	¹³⁴Pm
62	¹³⁹Sm	¹³⁴Sm
63	¹⁴⁰Eu	¹³⁴Eu
64	¹⁴¹Gd	¹³⁴Gd
65	¹⁴²Tb
66	¹⁴³Dy
67	¹⁴⁴Ho
68	¹⁴⁵Er
69	¹⁴⁶Tm