Osmium-185m1

Properties and data of the isotope ^185m1Os.

Contents

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

General data

Name of the isotope:Osmium-185m1; Os-185m1Symbol:^185m1Os or 185m176OsMass number A:185 (= number of nucleons)Atomic number Z:76 (= number of protons)Neutrons N:109Isotopic mass:184.9540460(9) u (atomic weight of Osmium-185m1)
Excitation energy: 102.37(11) keVNuclide mass:184.9123582 u (calculated nuclear mass without electrons)Mass excess:-42.80588 MeVMass defect:1.585132276 u (per nucleus)Nuclear binding energy:1476.5412043 MeV (per nucleus)
7.98130381 MeV (average binding energy per nucleon)Half-life:3.0(4) μsDecay constant λ:231049.06018665 s^-1Specific activity α:7.562010793478 × 10⁺²⁶ Bq g^-1
2.043786700940 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-

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
¹⁸⁵Os		93.6(5) d	1/2-
^185m2Os	275.53(12) keV	0.78(5) μs	11/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 109) and isobaric (same nucleon number A = 185) with Osmium-185m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 109	Isobar A = 185
68	¹⁷⁷Er
69	¹⁷⁸Tm
70	¹⁷⁹Yb	¹⁸⁵Yb
71	¹⁸⁰Lu	¹⁸⁵Lu
72	¹⁸¹Hf	¹⁸⁵Hf
73	¹⁸²Ta	¹⁸⁵Ta
74	¹⁸³W	¹⁸⁵W
75	¹⁸⁴Re	¹⁸⁵Re
76	¹⁸⁵Os	¹⁸⁵Os
77	¹⁸⁶Ir	¹⁸⁵Ir
78	¹⁸⁷Pt	¹⁸⁵Pt
79	¹⁸⁸Au	¹⁸⁵Au
80	¹⁸⁹Hg	¹⁸⁵Hg
81	¹⁹⁰Tl	¹⁸⁵Tl
82	¹⁹¹Pb	¹⁸⁵Pb
83	¹⁹²Bi	¹⁸⁵Bi
84	¹⁹³Po
85	¹⁹⁴At
86	¹⁹⁵Rn