Osmium-167

Properties and data of the isotope ¹⁶⁷Os.

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-167; Os-167Symbol:¹⁶⁷Os or 16776OsMass number A:167 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:91Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1973684210526 (= neutron-proton ratio)Neutron excess (N-Z):15Isotopic mass:166.97155(8) u (atomic weight of Osmium-167)Nuclide mass:166.9298622 u (calculated nuclear mass without electrons)Mass excess:-26.501 MeVMass defect:1.411659788 u (per nucleus)Nuclear binding energy:1314.95262256 MeV (per nucleus)
7.8739678 MeV (average binding energy per nucleon)Separation energy:S_N = 9.14(7) MeV (first neutron)
S_P = 1.9(1) MeV (first proton)Half-life:0.81(6) sDecay constant λ:0.85573725995055 s^-1Specific activity α:3.104439950914 × 10⁺²¹ Bq g^-1
83903782457.157 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1977

Radioactive Decay

Half-life T_½ = 0.81(6) s respectively 8.1 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶³W	57(8) %	5.98(5) MeV
EC/β⁺	¹⁶⁷Re	43(8) %	8.33(8) MeV

Parent Nuclides

Direct parent isotope is: ¹⁷¹Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 91) and isobaric (same nucleon number A = 167) with Osmium-167. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 91	Isobar A = 167
52	¹⁴³Te
53	¹⁴⁴I
54	¹⁴⁵Xe
55	¹⁴⁶Cs
56	¹⁴⁷Ba
57	¹⁴⁸La
58	¹⁴⁹Ce
59	¹⁵⁰Pr
60	¹⁵¹Nd
61	¹⁵²Pm
62	¹⁵³Sm
63	¹⁵⁴Eu	¹⁶⁷Eu
64	¹⁵⁵Gd	¹⁶⁷Gd
65	¹⁵⁶Tb	¹⁶⁷Tb
66	¹⁵⁷Dy	¹⁶⁷Dy
67	¹⁵⁸Ho	¹⁶⁷Ho
68	¹⁵⁹Er	¹⁶⁷Er
69	¹⁶⁰Tm	¹⁶⁷Tm
70	¹⁶¹Yb	¹⁶⁷Yb
71	¹⁶²Lu	¹⁶⁷Lu
72	¹⁶³Hf	¹⁶⁷Hf
73	¹⁶⁴Ta	¹⁶⁷Ta
74	¹⁶⁵W	¹⁶⁷W
75	¹⁶⁶Re	¹⁶⁷Re
76	¹⁶⁷Os	¹⁶⁷Os
77	¹⁶⁸Ir	¹⁶⁷Ir
78	¹⁶⁹Pt	¹⁶⁷Pt
79	¹⁷⁰Au
80	¹⁷¹Hg