Osmium-173

Properties and data of the isotope ¹⁷³Os.

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-173; Os-173Symbol:¹⁷³Os or 17376OsMass number A:173 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.2763157894737 (= neutron-proton ratio)Neutron excess (N-Z):21Isotopic mass:172.959808(16) u (atomic weight of Osmium-173)Nuclide mass:172.9181202 u (calculated nuclear mass without electrons)Mass excess:-37.43861 MeVMass defect:1.475391284 u (per nucleus)Nuclear binding energy:1374.3181287 MeV (per nucleus)
7.94403543 MeV (average binding energy per nucleon)Separation energy:S_N = 8.266(20) MeV (first neutron)
S_P = 3.19(4) MeV (first proton)Half-life:22.4(9) sDecay constant λ:0.030944070560712 s^-1Specific activity α:1.08342762614 × 10⁺²⁰ Bq g^-1
2928182773.3568 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Year of discovery:1971

Radioactive Decay

Half-life T_½ = 22.4(9) s respectively 2.24 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁹W	0.4(2) %	5.055(6) MeV
EC/β⁺	¹⁷³Re	99.6(2) %	6.12(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁷⁷Pt, ¹⁷³Ir.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 173) with Osmium-173. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 97	Isobar A = 173
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce
59	¹⁵⁶Pr
60	¹⁵⁷Nd
61	¹⁵⁸Pm
62	¹⁵⁹Sm
63	¹⁶⁰Eu
64	¹⁶¹Gd
65	¹⁶²Tb
66	¹⁶³Dy	¹⁷³Dy
67	¹⁶⁴Ho	¹⁷³Ho
68	¹⁶⁵Er	¹⁷³Er
69	¹⁶⁶Tm	¹⁷³Tm
70	¹⁶⁷Yb	¹⁷³Yb
71	¹⁶⁸Lu	¹⁷³Lu
72	¹⁶⁹Hf	¹⁷³Hf
73	¹⁷⁰Ta	¹⁷³Ta
74	¹⁷¹W	¹⁷³W
75	¹⁷²Re	¹⁷³Re
76	¹⁷³Os	¹⁷³Os
77	¹⁷⁴Ir	¹⁷³Ir
78	¹⁷⁵Pt	¹⁷³Pt
79	¹⁷⁶Au	¹⁷³Au
80	¹⁷⁷Hg	¹⁷³Hg
81	¹⁷⁸Tl
82	¹⁷⁹Pb