Iridium-176

Properties and data of the isotope ¹⁷⁶Ir.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Iridium-176; Ir-176Symbol:¹⁷⁶Ir or 17677IrMass number A:176 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:99Isotopic mass:175.963630(18) u (atomic weight of Iridium-176)Nuclide mass:175.9213938 u (calculated nuclear mass without electrons)Mass excess:-33.87844 MeVMass defect:1.496724148 u (per nucleus)Nuclear binding energy:1394.18956352 MeV (per nucleus)
7.92153161 MeV (average binding energy per nucleon)Separation energy:S_N = 8.555(21) MeV (first neutron)
S_P = 1.062(20) MeV (first proton)Half-life:8.7(5) sDecay constant λ:0.079672089719534 s^-1Specific activity α:2.741694553694 × 10⁺²⁰ Bq g^-1
7409985280.2557 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1967

Radioactive Decay

Half-life T_½ = 8.7(5) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷²Re	3.1(6) %	5.23(4) MeV
EC/β⁺	¹⁷⁶Os	96.9(6) %	8.22(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁸⁰Au.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 176) with Iridium-176. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 99	Isobar A = 176
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr
60	¹⁵⁹Nd
61	¹⁶⁰Pm
62	¹⁶¹Sm
63	¹⁶²Eu
64	¹⁶³Gd
65	¹⁶⁴Tb
66	¹⁶⁵Dy
67	¹⁶⁶Ho
68	¹⁶⁷Er	¹⁷⁶Er
69	¹⁶⁸Tm	¹⁷⁶Tm
70	¹⁶⁹Yb	¹⁷⁶Yb
71	¹⁷⁰Lu	¹⁷⁶Lu
72	¹⁷¹Hf	¹⁷⁶Hf
73	¹⁷²Ta	¹⁷⁶Ta
74	¹⁷³W	¹⁷⁶W
75	¹⁷⁴Re	¹⁷⁶Re
76	¹⁷⁵Os	¹⁷⁶Os
77	¹⁷⁶Ir	¹⁷⁶Ir
78	¹⁷⁷Pt	¹⁷⁶Pt
79	¹⁷⁸Au	¹⁷⁶Au
80	¹⁷⁹Hg	¹⁷⁶Hg
81	¹⁸⁰Tl	¹⁷⁶Tl
82	¹⁸¹Pb