Osmium-164

Properties and data of the isotope ¹⁶⁴Os.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Osmium-164; Os-164Symbol:¹⁶⁴Os or 16476OsMass number A:164 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:88Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.1578947368421 (= neutron-proton ratio)Neutron excess (N-Z):12Isotopic mass:163.97808(16) u (atomic weight of Osmium-164)Nuclide mass:163.9363922 u (calculated nuclear mass without electrons)Mass excess:-20.41835 MeVMass defect:1.37913504 u (per nucleus)Nuclear binding energy:1284.65601495 MeV (per nucleus)
7.83326838 MeV (average binding energy per nucleon)Separation energy:S_N = 12.30(33) MeV (first neutron)
S_P = 1.71(15) MeV (first proton)Half-life:21(1) msDecay constant λ:33.007008598093 s^-1Specific activity α:1.219465368974 × 10⁺²³ Bq g^-1
3295852348580 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1981

Radioactive Decay

Half-life T_½ = 21(1) ms respectively 2.1 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁰W	96 %	6.479(5) MeV
EC/β⁺	¹⁶⁴Re	4 %	7.05(16) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁶⁸Pt, ¹⁶⁵Ir.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 164) with Osmium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 88	Isobar A = 164
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te
53	¹⁴¹I
54	¹⁴²Xe
55	¹⁴³Cs
56	¹⁴⁴Ba
57	¹⁴⁵La
58	¹⁴⁶Ce
59	¹⁴⁷Pr
60	¹⁴⁸Nd
61	¹⁴⁹Pm
62	¹⁵⁰Sm	¹⁶⁴Sm
63	¹⁵¹Eu	¹⁶⁴Eu
64	¹⁵²Gd	¹⁶⁴Gd
65	¹⁵³Tb	¹⁶⁴Tb
66	¹⁵⁴Dy	¹⁶⁴Dy
67	¹⁵⁵Ho	¹⁶⁴Ho
68	¹⁵⁶Er	¹⁶⁴Er
69	¹⁵⁷Tm	¹⁶⁴Tm
70	¹⁵⁸Yb	¹⁶⁴Yb
71	¹⁵⁹Lu	¹⁶⁴Lu
72	¹⁶⁰Hf	¹⁶⁴Hf
73	¹⁶¹Ta	¹⁶⁴Ta
74	¹⁶²W	¹⁶⁴W
75	¹⁶³Re	¹⁶⁴Re
76	¹⁶⁴Os	¹⁶⁴Os
77	¹⁶⁵Ir	¹⁶⁴Ir
78	¹⁶⁶Pt