Lanthanum-132

Properties and data of the isotope ¹³²La.

Contents

General data

Name of the isotope:Lanthanum-132; La-132Symbol:¹³²La or 13257LaMass number A:132 (= number of nucleons)Atomic number Z:57 (= number of protons)Neutrons N:75Isotopic mass:131.91012(4) u (atomic weight of Lanthanum-132)Nuclide mass:131.8788531 u (calculated nuclear mass without electrons)Mass excess:-83.72268 MeVMass defect:1.185775524 u (per nucleus)Nuclear binding energy:1104.54278595 MeV (per nucleus)
8.36774838 MeV (average binding energy per nucleon)Separation energy:S_N = 8.03(5) MeV (first neutron)
S_P = 4.33(4) MeV (first proton)Half-life:4.8(2) hDecay constant λ:4.011268406018 × 10^-5 s^-1Specific activity α:1.84400178382 × 10⁺¹⁷ Bq g^-1
4983788.6049216 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Year of discovery:1951

Radioactive Decay

Half-life T_½ = 4.8(2) h (hours) respectively 1.7280 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹³²Ba	100 %	4.71(4) MeV

Parent Nuclides

Direct parent isotope is: ¹³²Ce.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^132mLa	188.20(11) keV	24.3(5) min	6-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 132) with Lanthanum-132. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 75	Isobar A = 132
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru
45	¹²⁰Rh
46	¹²¹Pd
47	¹²²Ag	¹³²Ag
48	¹²³Cd	¹³²Cd
49	¹²⁴In	¹³²In
50	¹²⁵Sn	¹³²Sn
51	¹²⁶Sb	¹³²Sb
52	¹²⁷Te	¹³²Te
53	¹²⁸I	¹³²I
54	¹²⁹Xe	¹³²Xe
55	¹³⁰Cs	¹³²Cs
56	¹³¹Ba	¹³²Ba
57	¹³²La	¹³²La
58	¹³³Ce	¹³²Ce
59	¹³⁴Pr	¹³²Pr
60	¹³⁵Nd	¹³²Nd
61	¹³⁶Pm	¹³²Pm
62	¹³⁷Sm	¹³²Sm
63	¹³⁸Eu	¹³²Eu
64	¹³⁹Gd
65	¹⁴⁰Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm