Iridium-184m2

Properties and data of the isotope ^184m2Ir.

Contents

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

General data

Name of the isotope:Iridium-184m2; Ir-184m2Symbol:^184m2Ir or 184m277IrMass number A:184 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:107Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3896103896104 (= neutron-proton ratio)Neutron excess (N-Z):30Excitation energy:328.40(24) keVIsotopic mass:183.95748(3) u (atomic weight of Iridium-184m2)Nuclide mass:183.9152438 u (calculated nuclear mass without electrons)Mass excess:-39.60712 MeVMass defect:1.572193476 u (per nucleus)Nuclear binding energy:1464.48878973 MeV (per nucleus)
7.95917821 MeV (average binding energy per nucleon)Half-life:350(90) nsDecay constant λ:1980420.5158856 s^-1Specific activity α:6.517142791569 × 10⁺²⁷ Bq g^-1
1.761389943667 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)(7)+

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
¹⁸⁴Ir		3.09(3) h	5-
^184m1Ir	225.65(11) keV	470(30) μs	3+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 184) with Iridium-184m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 107	Isobar A = 184
65	¹⁷²Tb
66	¹⁷³Dy
67	¹⁷⁴Ho
68	¹⁷⁵Er
69	¹⁷⁶Tm
70	¹⁷⁷Yb	¹⁸⁴Yb
71	¹⁷⁸Lu	¹⁸⁴Lu
72	¹⁷⁹Hf	¹⁸⁴Hf
73	¹⁸⁰Ta	¹⁸⁴Ta
74	¹⁸¹W	¹⁸⁴W
75	¹⁸²Re	¹⁸⁴Re
76	¹⁸³Os	¹⁸⁴Os
77	¹⁸⁴Ir	¹⁸⁴Ir
78	¹⁸⁵Pt	¹⁸⁴Pt
79	¹⁸⁶Au	¹⁸⁴Au
80	¹⁸⁷Hg	¹⁸⁴Hg
81	¹⁸⁸Tl	¹⁸⁴Tl
82	¹⁸⁹Pb	¹⁸⁴Pb
83	¹⁹⁰Bi	¹⁸⁴Bi
84	¹⁹¹Po
85	¹⁹²At
86	¹⁹³Rn