Osmium-190m

Properties and data of the isotope ^190mOs.

Contents

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

General data

Name of the isotope:Osmium-190m; Os-190mSymbol:^190mOs or 190m76OsMass number A:190 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:114Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.5 (= neutron-proton ratio)Neutron excess (N-Z):38Excitation energy:1705.4(2) keVIsotopic mass:189.95844(2) u (atomic weight of Osmium-190m)Nuclide mass:189.9167522 u (calculated nuclear mass without electrons)Mass excess:-38.71289 MeVMass defect:1.624062856 u (per nucleus)Nuclear binding energy:1512.80480599 MeV (per nucleus)
7.96213056 MeV (average binding energy per nucleon)Half-life:9.9(1) minDecay constant λ:0.0011669144453871 s^-1Specific activity α:3.718160402971 × 10⁺¹⁸ Bq g^-1
100490821.70193 Ci g^-1Spin and parity:
(nuclear angular momentum)(10)-Magnetic dipole moment:μ(μ_N) = - 0.56Nuclear g-factor:g_l = -0.056

Radioactive Decay

Half-life T_½ = 9.9(1) min (minutes) respectively 5.94 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁰Os	100 %

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
¹⁹⁰Os		stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 114) and isobaric (same nucleon number A = 190) with Osmium-190m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 114	Isobar A = 190
70	¹⁸⁴Yb
71	¹⁸⁵Lu
72	¹⁸⁶Hf	¹⁹⁰Hf
73	¹⁸⁷Ta	¹⁹⁰Ta
74	¹⁸⁸W	¹⁹⁰W
75	¹⁸⁹Re	¹⁹⁰Re
76	¹⁹⁰Os	¹⁹⁰Os
77	¹⁹¹Ir	¹⁹⁰Ir
78	¹⁹²Pt	¹⁹⁰Pt
79	¹⁹³Au	¹⁹⁰Au
80	¹⁹⁴Hg	¹⁹⁰Hg
81	¹⁹⁵Tl	¹⁹⁰Tl
82	¹⁹⁶Pb	¹⁹⁰Pb
83	¹⁹⁷Bi	¹⁹⁰Bi
84	¹⁹⁸Po	¹⁹⁰Po
85	¹⁹⁹At	¹⁹⁰At
86	²⁰⁰Rn
87	²⁰¹Fr
88	²⁰²Ra
89	²⁰³Ac