Lead-197
Properties and data of the isotope 197Pb.
See also: list of Lead isotopes.
General data
Name of the isotope:Lead-197; Pb-197Symbol:197Pb or 19782PbMass number A:197 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:115Isotopic mass:196.973435(5) u (atomic weight of Lead-197)Nuclide mass:196.9284566 u (calculated nuclear mass without electrons)Mass excess:-24.74514 MeVMass defect:1.664682964 u (per nucleus)Nuclear binding energy:1550.64219287 MeV (per nucleus)
7.87128017 MeV (average binding energy per nucleon)Separation energy:SN = 7.468(9) MeV (first neutron)
SP = 5.438(13) MeV (first proton)Half-life:8.1(17) minDecay constant λ:0.0014262287665842 s-1Specific activity α:4.382117617787 × 10+18 Bq g-1
118435611.29156 Ci g-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = - 1.075(2)Quadrupole moment Q:-0.08(2) barn (100 fm2)Nuclear g-factor:gl = -0.71666666666667Charge radius:5.4446(23) femtometer fmYear of discovery:1955
Radioactive Decay
Half-life T½ = 8.1(17) min (minutes) respectively 4.86 × 102 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β+ | 197Tl | 100 % | 3.596(17) MeV | |
Parent Nuclides
Direct parent isotopes are: 197Bi, 201Po.
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 |
---|
197m1Pb | 319.31(11) keV | 42.9(9) min | 13/2+ |
197m2Pb | 1914.10(25) keV | 1.15(20) μs | 21/2- |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 197) with Lead-197. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 115 | Isobar A = 197 |
70 | 185Yb | |
71 | 186Lu | |
72 | 187Hf | |
73 | 188Ta | |
74 | 189W | 197W |
75 | 190Re | 197Re |
76 | 191Os | 197Os |
77 | 192Ir | 197Ir |
78 | 193Pt | 197Pt |
79 | 194Au | 197Au |
80 | 195Hg | 197Hg |
81 | 196Tl | 197Tl |
82 | 197Pb | 197Pb |
83 | 198Bi | 197Bi |
84 | 199Po | 197Po |
85 | 200At | 197At |
86 | 201Rn | 197Rn |
87 | 202Fr | |
88 | 203Ra | |
89 | 204Ac | |
External data and identifiers
Last update: 2020-10-22
Perma link: https://www.chemlin.org/isotope/lead-197
© 1996 - 2024 ChemLin