Bismuth-203

Properties and data of the isotope ²⁰³Bi.

Contents

General data

Name of the isotope:Bismuth-203; Bi-203Symbol:²⁰³Bi or 20383BiMass number A:203 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:120Isotopic mass:202.976892(14) u (atomic weight of Bismuth-203)Nuclide mass:202.9313651 u (calculated nuclear mass without electrons)Mass excess:-21.52496 MeVMass defect:1.712375576 u (per nucleus)Nuclear binding energy:1595.06757479 MeV (per nucleus)
7.85747574 MeV (average binding energy per nucleon)Separation energy:S_N = 8.855(20) MeV (first neutron)
S_P = 2.875(13) MeV (first proton)Half-life:11.76(5) hDecay constant λ:1.637252410619 × 10^-5 s^-1Specific activity α:4.881071603971 × 10⁺¹⁶ Bq g^-1
1319208.5416139 Ci g^-1Spin and parity:
(nuclear angular momentum)9/2-Magnetic dipole moment:μ(μ_N) = - 0.67(7)Quadrupole moment Q:+ 4.017(13) barn (100 fm²)Nuclear g-factor:g_l = -0.14888888888889Charge radius:5.4911(911) femtometer fmYear of discovery:1950

Radioactive Decay

Half-life T_½ = 11.76(5) h (hours) respectively 4.2336 × 10⁴ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	²⁰³Pb	100 %	3.262(14) MeV

Parent Nuclides

Direct parent isotopes are: ²⁰⁷At, ²⁰³Po.

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
^203mBi	1098.12(12) keV	305(5) ms	1/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 120) and isobaric (same nucleon number A = 203) with Bismuth-203. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 120	Isobar A = 203
73	¹⁹³Ta
74	¹⁹⁴W
75	¹⁹⁵Re
76	¹⁹⁶Os	²⁰³Os
77	¹⁹⁷Ir	²⁰³Ir
78	¹⁹⁸Pt	²⁰³Pt
79	¹⁹⁹Au	²⁰³Au
80	²⁰⁰Hg	²⁰³Hg
81	²⁰¹Tl	²⁰³Tl
82	²⁰²Pb	²⁰³Pb
83	²⁰³Bi	²⁰³Bi
84	²⁰⁴Po	²⁰³Po
85	²⁰⁵At	²⁰³At
86	²⁰⁶Rn	²⁰³Rn
87	²⁰⁷Fr	²⁰³Fr
88	²⁰⁸Ra	²⁰³Ra
89	²⁰⁹Ac	²⁰³Ac
90	²¹⁰Th