Iridium-164

Properties and data of the isotope ¹⁶⁴Ir.

Contents

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

General data

Name of the isotope:Iridium-164; Ir-164Symbol:¹⁶⁴Ir or 16477IrMass number A:164 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:87Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.1298701298701 (= neutron-proton ratio)Neutron excess (N-Z):10Isotopic mass:163.99212(34) u (atomic weight of Iridium-164)Nuclide mass:163.9498838 u (calculated nuclear mass without electrons)Mass excess:-7.34017 MeVMass defect:1.364255156 u (per nucleus)Nuclear binding energy:1270.79549228 MeV (per nucleus)
7.748753 MeV (average binding energy per nucleon)Half-life:Spin and parity:
(nuclear angular momentum)

Radioactive Decay

Decay mode	Daughter	Probability	Decay energy
α	¹⁶⁰Re	?	6.97(10) MeV
EC/β⁺	¹⁶⁴Os	?	13.08(35) MeV
p	¹⁶³Os	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 164) with Iridium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 87	Isobar A = 164
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb
52	¹³⁹Te
53	¹⁴⁰I
54	¹⁴¹Xe
55	¹⁴²Cs
56	¹⁴³Ba
57	¹⁴⁴La
58	¹⁴⁵Ce
59	¹⁴⁶Pr
60	¹⁴⁷Nd
61	¹⁴⁸Pm
62	¹⁴⁹Sm	¹⁶⁴Sm
63	¹⁵⁰Eu	¹⁶⁴Eu
64	¹⁵¹Gd	¹⁶⁴Gd
65	¹⁵²Tb	¹⁶⁴Tb
66	¹⁵³Dy	¹⁶⁴Dy
67	¹⁵⁴Ho	¹⁶⁴Ho
68	¹⁵⁵Er	¹⁶⁴Er
69	¹⁵⁶Tm	¹⁶⁴Tm
70	¹⁵⁷Yb	¹⁶⁴Yb
71	¹⁵⁸Lu	¹⁶⁴Lu
72	¹⁵⁹Hf	¹⁶⁴Hf
73	¹⁶⁰Ta	¹⁶⁴Ta
74	¹⁶¹W	¹⁶⁴W
75	¹⁶²Re	¹⁶⁴Re
76	¹⁶³Os	¹⁶⁴Os
77	¹⁶⁴Ir	¹⁶⁴Ir
78	¹⁶⁵Pt