Bismuth-209

Properties and data of the isotope ²⁰⁹Bi.

Contents

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

Literature

General data

Name of the isotope:Bismuth-209; Bi-209Symbol:²⁰⁹Bi or 20983BiMass number A:209 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:126Isotopic mass:208.9803985(15) u (atomic weight of Bismuth-209)Nuclide mass:208.9348716 u (calculated nuclear mass without electrons)Mass excess:-18.25868 MeVMass defect:1.760858572 u (per nucleus)Nuclear binding energy:1640.22919467 MeV (per nucleus)
7.84798658 MeV (average binding energy per nucleon)Separation energy:S_N = 7.4598(19) MeV (first neutron)
S_P = 3.7990(8) MeV (first proton)Half-life:2.01(8) × 10¹⁹ aDecay constant λ:1.093510095009 × 10^-27 s^-1Specific activity α:3.165996069187 × 10^-6 Bq g^-1
8.556746132938 × 10^-17 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2-Magnetic dipole moment:μ(μ_N) = + 4.1106(2)Charge radius:5.5211(906) femtometer fmYear of discovery:1924

Radioactive Decay

Half-life T_½ = 2.01(8) × 10¹⁹ a respectively 6.338736 × 10²⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	²⁰⁵Tl	100 %	3.1373(8) MeV

Parent Nuclides

Direct parent isotopes are: ²¹³At, ²⁰⁹Po, ²⁰⁹Pb.

Occurrence

Comparison of the natural Bismuth isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Bismuth Isotopic mixture	208.98040 u	100 %
Isotope ²⁰⁹Bi	208.9803985(15) u	100 %	2.01(8) × 10¹⁹ a	9/2-

NMR data

Nuclear magnetic properties of the NMR active Nuclide ²⁰⁹Bi

Isotope:²⁰⁹Bi-NMRQuantity:100 %Spin:9/2-Nuclearmagnetic moment
μ/μ_N:+ 4.1106(2)Gyromagnetic ratio γ:4.3752 · 10⁷ rad T^-1 s^-1Nuclear g-factor:g_l = 0.91346666666667Quadrupole moment Q:-0.516(15) barn (100 fm²)Line width parameter (factor):l = 197.23 fm⁴Resonance frequency:v₀ = 6.9630 at 1 TRelative Sensitivity:0.14433 (H₀ = const.)
5.3968 (v₀ = const.)
[related to ¹H = 1.000]

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 126) and isobaric (same nucleon number A = 209) with Bismuth-209. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 126	Isobar A = 209
76	²⁰²Os
77	²⁰³Ir
78	²⁰⁴Pt
79	²⁰⁵Au	²⁰⁹Au
80	²⁰⁶Hg	²⁰⁹Hg
81	²⁰⁷Tl	²⁰⁹Tl
82	²⁰⁸Pb	²⁰⁹Pb
83	²⁰⁹Bi	²⁰⁹Bi
84	²¹⁰Po	²⁰⁹Po
85	²¹¹At	²⁰⁹At
86	²¹²Rn	²⁰⁹Rn
87	²¹³Fr	²⁰⁹Fr
88	²¹⁴Ra	²⁰⁹Ra
89	²¹⁵Ac	²⁰⁹Ac
90	²¹⁶Th	²⁰⁹Th
91	²¹⁷Pa
92	²¹⁸U
93	²¹⁹Np

External data and identifiers

Adopted Levels, Gammas:NuDat 209Bi

Literature and References

[1] - Pierre de Marcillac, Noël Coron, Gérard Dambier, Jacques Leblanc, Jean-Pierre Moalic:
Experimental detection of α-particles from the radioactive decay of natural bismuth.
In: Nature, (2003), DOI 10.1038/nature01541.

[2] - J. W. Beeman, M. Biassoni, C. Brofferio, C. Bucci et al.:
First Measurement of the Partial Widths of ²⁰⁹Bi Decay to the Ground and to the First Excited States.
In: Physical Review Letters, (2012), DOI 10.1103/PhysRevLett.108.062501.