Lanthanum-152

Properties and data of the isotope ¹⁵²La.

Contents

General data

Name of the isotope:Lanthanum-152; La-152Symbol:¹⁵²La or 15257LaMass number A:152 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:95Isotopic mass:151.94708(32) u (atomic weight of Lanthanum-152)Nuclide mass:151.9158131 u (calculated nuclear mass without electrons)Mass excess:-49.29466 MeVMass defect:1.322113844 u (per nucleus)Nuclear binding energy:1231.541113 MeV (per nucleus)
8.10224416 MeV (average binding energy per nucleon)Separation energy:S_N = 4.05(53) MeV (first neutron)
S_P = 11.64(50) MeV (first proton)Half-life:298 msDecay constant λ:2.3259972502012 s^-1Specific activity α:9.276478861282 × 10⁺²¹ Bq g^-1
250715644899.53 Ci g^-1Spin and parity:
(nuclear angular momentum)(2-)Year of discovery:1994

Radioactive Decay

Half-life T_½ = 298 ms respectively 2.98 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁵²Ce	100 %	9.69(36) MeV
β^-, n	¹⁵¹Ce	?	3.86(20) MeV

Parent Nuclides

Direct parent isotope is: ¹⁵²Ba.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 152) with Lanthanum-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 95	Isobar A = 152
55	¹⁵⁰Cs
56	¹⁵¹Ba	¹⁵²Ba
57	¹⁵²La	¹⁵²La
58	¹⁵³Ce	¹⁵²Ce
59	¹⁵⁴Pr	¹⁵²Pr
60	¹⁵⁵Nd	¹⁵²Nd
61	¹⁵⁶Pm	¹⁵²Pm
62	¹⁵⁷Sm	¹⁵²Sm
63	¹⁵⁸Eu	¹⁵²Eu
64	¹⁵⁹Gd	¹⁵²Gd
65	¹⁶⁰Tb	¹⁵²Tb
66	¹⁶¹Dy	¹⁵²Dy
67	¹⁶²Ho	¹⁵²Ho
68	¹⁶³Er	¹⁵²Er
69	¹⁶⁴Tm	¹⁵²Tm
70	¹⁶⁵Yb	¹⁵²Yb
71	¹⁶⁶Lu	¹⁵²Lu
72	¹⁶⁷Hf
73	¹⁶⁸Ta
74	¹⁶⁹W
75	¹⁷⁰Re
76	¹⁷¹Os
77	¹⁷²Ir
78	¹⁷³Pt
79	¹⁷⁴Au
80	¹⁷⁵Hg
81	¹⁷⁶Tl