Lead-179

Properties and data of the isotope ¹⁷⁹Pb.

Content

General data

Name of the isotope:Lead-179; Pb-179Symbol:¹⁷⁹Pb or 17982PbMass number A:179 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:97Isotopic mass:179.00220(8) u (atomic weight of Lead-179)Nuclide mass:178.9572216 u (calculated nuclear mass without electrons)Mass excess:2.04929 MeVMass defect:1.479949476 u (per nucleus)Nuclear binding energy:1378.5640572 MeV (per nucleus)
7.70147518 MeV (average binding energy per nucleon)Separation energy:S_N = 9.59(80) MeV (first neutron)
S_P = 0.45(12) MeV (first proton)Half-life:ca. 3.5 msDecay constant λ:198.04205158856 s^-1Specific activity α:6.662777267358 × 10⁺²³ Bq g^-1
18007506127995 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2-)Year of discovery:2010

Radioactive Decay

Half-life T_½ = ca. 3.5 ms respectively 3.5 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷⁵Hg	100 %	7.598(20) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 179) with Lead-179. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 97	Isobar A = 179
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce
59	¹⁵⁶Pr
60	¹⁵⁷Nd
61	¹⁵⁸Pm
62	¹⁵⁹Sm
63	¹⁶⁰Eu
64	¹⁶¹Gd
65	¹⁶²Tb
66	¹⁶³Dy
67	¹⁶⁴Ho
68	¹⁶⁵Er
69	¹⁶⁶Tm	¹⁷⁹Tm
70	¹⁶⁷Yb	¹⁷⁹Yb
71	¹⁶⁸Lu	¹⁷⁹Lu
72	¹⁶⁹Hf	¹⁷⁹Hf
73	¹⁷⁰Ta	¹⁷⁹Ta
74	¹⁷¹W	¹⁷⁹W
75	¹⁷²Re	¹⁷⁹Re
76	¹⁷³Os	¹⁷⁹Os
77	¹⁷⁴Ir	¹⁷⁹Ir
78	¹⁷⁵Pt	¹⁷⁹Pt
79	¹⁷⁶Au	¹⁷⁹Au
80	¹⁷⁷Hg	¹⁷⁹Hg
81	¹⁷⁸Tl	¹⁷⁹Tl
82	¹⁷⁹Pb	¹⁷⁹Pb