Polonium-196m

Properties and data of the isotope ^196mPo.

Contents

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

General data

Name of the isotope:Polonium-196m; Po-196mSymbol:^196mPo or 196m84PoMass 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):28Excitation energy:2493.9(4) keVIsotopic mass:195.985536(15) u (atomic weight of Polonium-196m)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)Half-life:856(17) nsDecay constant λ:809751.37915881 s^-1Specific activity α:2.500736854780 × 10⁺²⁷ Bq g^-1
6.758748256164 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)11-

Radioactive Decay

Half-life T_½ = 856(17) ns respectively 8.56 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁶Po

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
¹⁹⁶Po		5.8(2) s	0+

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-196m. 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