Bismuth-189

Properties and data of the isotope ¹⁸⁹Bi.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Bismuth-189; Bi-189Symbol:¹⁸⁹Bi or 18983BiMass number A:189 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:106Isotopic mass:188.989195(22) u (atomic weight of Bismuth-189)Nuclide mass:188.9436681 u (calculated nuclear mass without electrons)Mass excess:-10.06479 MeVMass defect:1.578763752 u (per nucleus)Nuclear binding energy:1470.60896241 MeV (per nucleus)
7.7809998 MeV (average binding energy per nucleon)Separation energy:S_N = 10.941(24) MeV (first neutron)
S_P = -0.462(23) MeV (first proton)Half-life:688(5) msDecay constant λ:1.0074813670929 s^-1Specific activity α:3.22723122680 × 10⁺²¹ Bq g^-1
87222465589.351 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2-)Year of discovery:1973

Radioactive Decay

Half-life T_½ = 688(5) ms respectively 6.88 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸⁵Tl	~100 %	7.2682(27) MeV

Parent Nuclides

Direct parent isotope is: ¹⁹³At.

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
^189m1Bi	184(8) keV	5.0(1) ms	(1/2+)
^189m2Bi	357.6(5) keV	0.88(5) ms	(13/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 189) with Bismuth-189. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 189
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm
70	¹⁷⁶Yb
71	¹⁷⁷Lu
72	¹⁷⁸Hf	¹⁸⁹Hf
73	¹⁷⁹Ta	¹⁸⁹Ta
74	¹⁸⁰W	¹⁸⁹W
75	¹⁸¹Re	¹⁸⁹Re
76	¹⁸²Os	¹⁸⁹Os
77	¹⁸³Ir	¹⁸⁹Ir
78	¹⁸⁴Pt	¹⁸⁹Pt
79	¹⁸⁵Au	¹⁸⁹Au
80	¹⁸⁶Hg	¹⁸⁹Hg
81	¹⁸⁷Tl	¹⁸⁹Tl
82	¹⁸⁸Pb	¹⁸⁹Pb
83	¹⁸⁹Bi	¹⁸⁹Bi
84	¹⁹⁰Po	¹⁸⁹Po
85	¹⁹¹At	¹⁸⁹At