Lead-196

Properties and data of the isotope ¹⁹⁶Pb.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Lead isotopes (and general data sources).

General data

Name of the isotope:Lead-196; Pb-196Symbol:¹⁹⁶Pb or 19682PbMass number A:196 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:114Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.390243902439 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:195.972787(8) u (atomic weight of Lead-196)Nuclide mass:195.9278086 u (calculated nuclear mass without electrons)Mass excess:-25.34875 MeVMass defect:1.656666048 u (per nucleus)Nuclear binding energy:1543.17448372 MeV (per nucleus)
7.8733392 MeV (average binding energy per nucleon)Separation energy:S_N = 9.712(29) MeV (first neutron)
S_P = 4.482(13) MeV (first proton)Half-life:37(3) minDecay constant λ:0.00031222845971169 s^-1Specific activity α:9.642480845460 × 10⁺¹⁷ Bq g^-1
26060759.041786 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.4444(23) femtometer fmYear of discovery:1957

Radioactive Decay

Half-life T_½ = 37(3) min (minutes) respectively 2.220 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	¹⁹⁶Tl	> 99.9 %	2.148(14) MeV
α	¹⁹²Hg	trace	4.238(17) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁹⁶Bi, ²⁰⁰Po.

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
^196m1Pb	1049.20(9) keV	< 100 ns	2+
^196m2Pb	1738.27(12) keV	1 μs	4+
^196m3Pb	1797.51(14) keV	140(14) ns	5-
^196m4Pb	2694.12(19) keV	270(4) ns	12+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 114) and isobaric (same nucleon number A = 196) with Lead-196. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 114	Isobar A = 196
70	¹⁸⁴Yb
71	¹⁸⁵Lu
72	¹⁸⁶Hf
73	¹⁸⁷Ta
74	¹⁸⁸W	¹⁹⁶W
75	¹⁸⁹Re	¹⁹⁶Re
76	¹⁹⁰Os	¹⁹⁶Os
77	¹⁹¹Ir	¹⁹⁶Ir
78	¹⁹²Pt	¹⁹⁶Pt
79	¹⁹³Au	¹⁹⁶Au
80	¹⁹⁴Hg	¹⁹⁶Hg
81	¹⁹⁵Tl	¹⁹⁶Tl
82	¹⁹⁶Pb	¹⁹⁶Pb
83	¹⁹⁷Bi	¹⁹⁶Bi
84	¹⁹⁸Po	¹⁹⁶Po
85	¹⁹⁹At	¹⁹⁶At
86	²⁰⁰Rn	¹⁹⁶Rn
87	²⁰¹Fr
88	²⁰²Ra
89	²⁰³Ac