Osmium-163

Properties and data of the isotope ¹⁶³Os.

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-163; Os-163Symbol:¹⁶³Os or 16376OsMass number A:163 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:87Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1447368421053 (= neutron-proton ratio)Neutron excess (N-Z):11Isotopic mass:162.98262(32) u (atomic weight of Osmium-163)Nuclide mass:162.9409322 u (calculated nuclear mass without electrons)Mass excess:-16.18937 MeVMass defect:1.365930124 u (per nucleus)Nuclear binding energy:1272.35571493 MeV (per nucleus)
7.80586328 MeV (average binding energy per nucleon)Separation energy:S_N = 9.82(36) MeV (first neutron)
S_P = 0.98(36) MeV (first proton)Half-life:5.5(6) msDecay constant λ:126.02676010181 s^-1Specific activity α:4.684882107744 × 10⁺²³ Bq g^-1
12661843534444 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Year of discovery:1981

Radioactive Decay

Half-life T_½ = 5.5(6) ms respectively 5.5 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁵⁹W	ca. 100 %	6.677(8) MeV
EC/β⁺	¹⁶³Re	?	9.81(30) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁷Pt.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 163) with Osmium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 87	Isobar A = 163
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb
52	¹³⁹Te
53	¹⁴⁰I
54	¹⁴¹Xe
55	¹⁴²Cs
56	¹⁴³Ba
57	¹⁴⁴La
58	¹⁴⁵Ce
59	¹⁴⁶Pr
60	¹⁴⁷Nd	¹⁶³Nd
61	¹⁴⁸Pm	¹⁶³Pm
62	¹⁴⁹Sm	¹⁶³Sm
63	¹⁵⁰Eu	¹⁶³Eu
64	¹⁵¹Gd	¹⁶³Gd
65	¹⁵²Tb	¹⁶³Tb
66	¹⁵³Dy	¹⁶³Dy
67	¹⁵⁴Ho	¹⁶³Ho
68	¹⁵⁵Er	¹⁶³Er
69	¹⁵⁶Tm	¹⁶³Tm
70	¹⁵⁷Yb	¹⁶³Yb
71	¹⁵⁸Lu	¹⁶³Lu
72	¹⁵⁹Hf	¹⁶³Hf
73	¹⁶⁰Ta	¹⁶³Ta
74	¹⁶¹W	¹⁶³W
75	¹⁶²Re	¹⁶³Re
76	¹⁶³Os	¹⁶³Os
77	¹⁶⁴Ir
78	¹⁶⁵Pt