Osmium-195m

Properties and data of the isotope ^195mOs.

Contents

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

General data

Name of the isotope:Osmium-195m; Os-195mSymbol:^195mOs or 195m76OsMass number A:195 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:119Isotopic mass:194.96832(6) u (atomic weight of Osmium-195m)
Excitation energy: 454(10) keVNuclide mass:194.9266322 u (calculated nuclear mass without electrons)Mass excess:-29.50973 MeVMass defect:1.657507436 u (per nucleus)Nuclear binding energy:1543.95823159 MeV (per nucleus)
7.91773452 MeV (average binding energy per nucleon)Half-life:9 minDecay constant λ:0.0012836058899258 s^-1Specific activity α:3.984564679266 × 10⁺¹⁸ Bq g^-1
107690937.27748 Ci g^-1Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Half-life T_½ = 9 min (minutes) respectively 5.40 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁵Os	> 0 %
β^-	¹⁹⁵Ir	?

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
¹⁹⁵Os		6.5(11) min	(3/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 119) and isobaric (same nucleon number A = 195) with Osmium-195m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 119	Isobar A = 195
73	¹⁹²Ta
74	¹⁹³W	¹⁹⁵W
75	¹⁹⁴Re	¹⁹⁵Re
76	¹⁹⁵Os	¹⁹⁵Os
77	¹⁹⁶Ir	¹⁹⁵Ir
78	¹⁹⁷Pt	¹⁹⁵Pt
79	¹⁹⁸Au	¹⁹⁵Au
80	¹⁹⁹Hg	¹⁹⁵Hg
81	²⁰⁰Tl	¹⁹⁵Tl
82	²⁰¹Pb	¹⁹⁵Pb
83	²⁰²Bi	¹⁹⁵Bi
84	²⁰³Po	¹⁹⁵Po
85	²⁰⁴At	¹⁹⁵At
86	²⁰⁵Rn	¹⁹⁵Rn
87	²⁰⁶Fr
88	²⁰⁷Ra
89	²⁰⁸Ac
90	²⁰⁹Th
91	²¹⁰Pa