Lead-197m1
Properties and data of the isotope 197Pb.
See also: list of Lead isotopes.
General data
Name of the isotope:Lead-197m1; Pb-197m1Symbol: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-197m1)
Excitation energy: 319.31(11) keVNuclide 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)Half-life:42.9(9) minDecay constant λ:0.00026928794893549 s-1Specific activity α:8.273928369249 × 10+17 Bq g-1
22361968.56554 Ci g-1Spin and parity:
(nuclear angular momentum)13/2+Magnetic dipole moment:μ(μN) = - 1.098(11)Quadrupole moment Q:0.38(2) barn (100 fm2)Nuclear g-factor:gl = -0.16892307692308
Radioactive Decay
Half-life T½ = 42.9(9) min (minutes) respectively 2.574 × 103 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β+ | 197Tl | 81(2) % | ? | |
Iso | 197Pb | 19(2) % | | |
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 |
---|
197Pb | | 8.1(17) min | 3/2- |
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-197m1. 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-197m1
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