Bismuth-200

Properties and data of the isotope ²⁰⁰Bi.

Contents

General data

Name of the isotope:Bismuth-200; Bi-200Symbol:²⁰⁰Bi or 20083BiMass number A:200 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:117Isotopic mass:199.978131(24) u (atomic weight of Bismuth-200)Nuclide mass:199.9326041 u (calculated nuclear mass without electrons)Mass excess:-20.37084 MeVMass defect:1.685141828 u (per nucleus)Nuclear binding energy:1569.69950193 MeV (per nucleus)
7.84849751 MeV (average binding energy per nucleon)Separation energy:S_N = 7.645(25) MeV (first neutron)
S_P = 2.428(24) MeV (first proton)Half-life:36.4(5) minDecay constant λ:0.00031737508267397 s^-1Specific activity α:9.604409313048 × 10⁺¹⁷ Bq g^-1
25957863.00824 Ci g^-1Spin and parity:
(nuclear angular momentum)7+Year of discovery:1950

Radioactive Decay

Half-life T_½ = 36.4(5) min (minutes) respectively 2.184 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	²⁰⁰Pb	100 %	5.880(25) MeV

Parent Nuclides

Direct parent isotopes are: ²⁰⁴At, ²⁰⁰Po.

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
^200m1Bi	+x keV	31(2) min	(2+)
^200m2Bi	428.20(10) keV	0.40(5) s	(10-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 117) and isobaric (same nucleon number A = 200) with Bismuth-200. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 117	Isobar A = 200
71	¹⁸⁸Lu
72	¹⁸⁹Hf
73	¹⁹⁰Ta
74	¹⁹¹W
75	¹⁹²Re
76	¹⁹³Os	²⁰⁰Os
77	¹⁹⁴Ir	²⁰⁰Ir
78	¹⁹⁵Pt	²⁰⁰Pt
79	¹⁹⁶Au	²⁰⁰Au
80	¹⁹⁷Hg	²⁰⁰Hg
81	¹⁹⁸Tl	²⁰⁰Tl
82	¹⁹⁹Pb	²⁰⁰Pb
83	²⁰⁰Bi	²⁰⁰Bi
84	²⁰¹Po	²⁰⁰Po
85	²⁰²At	²⁰⁰At
86	²⁰³Rn	²⁰⁰Rn
87	²⁰⁴Fr	²⁰⁰Fr
88	²⁰⁵Ra
89	²⁰⁶Ac
90	²⁰⁷Th