Polonium-196

Properties and data of the isotope ¹⁹⁶Po.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Polonium-196; Po-196Symbol:¹⁹⁶Po or 19684PoMass number A:196 (= number of nucleons)Atomic number Z:84 (= number of protons)Neutrons N:112Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3333333333333 (= neutron-proton ratio)Neutron excess (N-Z):28Isotopic mass:195.985536(15) u (atomic weight of Polonium-196)Nuclide mass:195.9394607 u (calculated nuclear mass without electrons)Mass excess:-13.47313 MeVMass defect:1.64223728 u (per nucleus)Nuclear binding energy:1529.7341729 MeV (per nucleus)
7.80476619 MeV (average binding energy per nucleon)Separation energy:S_N = 10.49(4) MeV (first neutron)
S_P = 2.736(15) MeV (first proton)Half-life:5.8(2) sDecay constant λ:0.1195081345793 s^-1Specific activity α:3.69074266843 × 10⁺²⁰ Bq g^-1
9974980184.9595 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1967

Radioactive Decay

Half-life T_½ = 5.8(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁹²Pb	ca. 98 %	6.6581(24) MeV
EC/β⁺	¹⁹⁶Bi	ca. 2 %	4.536(28) MeV

Parent Nuclides

Direct parent isotope is: ²⁰⁰Rn.

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
^196mPo	2493.9(4) keV	856(17) ns	11-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 112) and isobaric (same nucleon number A = 196) with Polonium-196. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 112	Isobar A = 196
70	¹⁸²Yb
71	¹⁸³Lu
72	¹⁸⁴Hf
73	¹⁸⁵Ta
74	¹⁸⁶W	¹⁹⁶W
75	¹⁸⁷Re	¹⁹⁶Re
76	¹⁸⁸Os	¹⁹⁶Os
77	¹⁸⁹Ir	¹⁹⁶Ir
78	¹⁹⁰Pt	¹⁹⁶Pt
79	¹⁹¹Au	¹⁹⁶Au
80	¹⁹²Hg	¹⁹⁶Hg
81	¹⁹³Tl	¹⁹⁶Tl
82	¹⁹⁴Pb	¹⁹⁶Pb
83	¹⁹⁵Bi	¹⁹⁶Bi
84	¹⁹⁶Po	¹⁹⁶Po
85	¹⁹⁷At	¹⁹⁶At
86	¹⁹⁸Rn	¹⁹⁶Rn
87	¹⁹⁹Fr