Osmium-195

Properties and data of the isotope ¹⁹⁵Os.

Contents

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

General data

Name of the isotope:Osmium-195; Os-195Symbol:¹⁹⁵Os or 19576OsMass 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-195)Nuclide 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)Separation energy:S_N = 5.15(6) MeV (first neutron)
S_P = 9.56(20) MeV (first proton)Half-life:6.5(11) minDecay constant λ:0.0017773004629742 s^-1Specific activity α:5.51708955590 × 10⁺¹⁸ Bq g^-1
149110528.53805 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Year of discovery:2004

Radioactive Decay

Half-life T_½ = 6.5(11) min (minutes) respectively 3.90 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹⁵Ir	?	2.18(6) MeV

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
^195mOs	454(10) keV	9 min

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-195. 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