Iridium-187m2

Properties and data of the isotope ¹⁸⁷Ir.

Content

General data

Name of the isotope:Iridium-187m2; Ir-187m2Symbol:¹⁸⁷Ir or 18777IrMass number A:187 (= number of nucleons)Atomic number Z:77 (= number of protons)Neutrons N:110Isotopic mass:186.95754(3) u (atomic weight of Iridium-187m2)
Excitation energy: 433.75(6) keVNuclide mass:186.9153038 u (calculated nuclear mass without electrons)Mass excess:-39.55124 MeVMass defect:1.598128224 u (per nucleus)Nuclear binding energy:1488.64685189 MeV (per nucleus)
7.96067835 MeV (average binding energy per nucleon)Half-life:152(12) nsDecay constant λ:4560178.8194733 s^-1Specific activity α:1.476453720288 × 10⁺²⁸ Bq g^-1
3.990415460239 × 10⁺¹⁷ Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-Magnetic dipole moment:μ(μ_N) = +.621(5)Quadrupole moment Q:3.1(3) barn (100 fm²)Nuclear g-factor:g_l = 0.11290909090909

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
¹⁸⁷Ir		10.5(3) h	3/2+
^187m1Ir	186.16(4) keV	30.3(6) ms	9/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 110) and isobaric (same nucleon number A = 187) with Iridium-187m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 110	Isobar A = 187
69	¹⁷⁹Tm
70	¹⁸⁰Yb
71	¹⁸¹Lu	¹⁸⁷Lu
72	¹⁸²Hf	¹⁸⁷Hf
73	¹⁸³Ta	¹⁸⁷Ta
74	¹⁸⁴W	¹⁸⁷W
75	¹⁸⁵Re	¹⁸⁷Re
76	¹⁸⁶Os	¹⁸⁷Os
77	¹⁸⁷Ir	¹⁸⁷Ir
78	¹⁸⁸Pt	¹⁸⁷Pt
79	¹⁸⁹Au	¹⁸⁷Au
80	¹⁹⁰Hg	¹⁸⁷Hg
81	¹⁹¹Tl	¹⁸⁷Tl
82	¹⁹²Pb	¹⁸⁷Pb
83	¹⁹³Bi	¹⁸⁷Bi
84	¹⁹⁴Po	¹⁸⁷Po
85	¹⁹⁵At
86	¹⁹⁶Rn