Lead-195m2

Properties and data of the isotope ^195m2Pb.

Contents

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

General data

Name of the isotope:Lead-195m2; Pb-195m2Symbol:^195m2Pb or 195m282PbMass number A:195 (= number of nucleons)Atomic number Z:82 (= number of protons)Neutrons N:113Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.3780487804878 (= neutron-proton ratio)Neutron excess (N-Z):31Excitation energy:1759.0(7) keVIsotopic mass:194.974549(19) u (atomic weight of Lead-195m2)Nuclide mass:194.9295706 u (calculated nuclear mass without electrons)Mass excess:-23.70745 MeVMass defect:1.646239132 u (per nucleus)Nuclear binding energy:1533.46187402 MeV (per nucleus)
7.86390705 MeV (average binding energy per nucleon)Half-life:10.0(7) μsDecay constant λ:69314.718055995 s^-1Specific activity α:2.151664926804 × 10⁺²⁶ Bq g^-1
5.815310612984 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)21/2-

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
¹⁹⁵Pb		15 min	3/2-
^195m1Pb	202.9(7) keV	15.0(12) min	13/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 113) and isobaric (same nucleon number A = 195) with Lead-195m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 113	Isobar A = 195
70	¹⁸³Yb
71	¹⁸⁴Lu
72	¹⁸⁵Hf
73	¹⁸⁶Ta
74	¹⁸⁷W	¹⁹⁵W
75	¹⁸⁸Re	¹⁹⁵Re
76	¹⁸⁹Os	¹⁹⁵Os
77	¹⁹⁰Ir	¹⁹⁵Ir
78	¹⁹¹Pt	¹⁹⁵Pt
79	¹⁹²Au	¹⁹⁵Au
80	¹⁹³Hg	¹⁹⁵Hg
81	¹⁹⁴Tl	¹⁹⁵Tl
82	¹⁹⁵Pb	¹⁹⁵Pb
83	¹⁹⁶Bi	¹⁹⁵Bi
84	¹⁹⁷Po	¹⁹⁵Po
85	¹⁹⁸At	¹⁹⁵At
86	¹⁹⁹Rn	¹⁹⁵Rn
87	²⁰⁰Fr
88	²⁰¹Ra