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Bismuth-215

Properties and data of the isotope 215Bi.

 

Bismuth-215 is the radioisotope of the element Bismuth, whose atomic nucleus has 132 neutrons in addition to the element-specific 83 protons, resulting in a mass number of 215: 215 Bi.

See also: list of Bismuth isotopes.

 

General data

Name of the isotope:Bismuth-215; Bi-215Symbol:215BiMass number A:215Atomic number Z:83 (= number of protons)Neutrons N:132Isotopic mass:215.001749(6) u (atomic weight of Bismuth-215)Nuclide mass:214.9562221 u (calculated nuclear mass without electrons)Mass excess:1.62918 MeVMass defect:1.791497568 u (per nucleus)Nuclear binding energy:1668.76923561 MeV (per nucleus)
7.76171737 MeV (average binding energy per nucleon)
Separation energy:SN = 5.241(13) MeV (first neutron)
SP = 5.477(6) MeV (first proton)
Half-life:7.6(2) minDecay constant λ:0.0015200596064911 s-1Spin and parity:(9/2-)Year of discovery:1953

 

Radioactive Decay

Half-life T½ = 7.6(2) min (minutes) respectively 4.56 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-215Po100 %2,171(6) MeV

 

Bismuth-215 radioactive decay cascade

 

Parent Nuclides

Direct parent isotope is: 219At.

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
215mBi1347+x keV36,9(6) s(25/2-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 132) and isobaric (same nucleon number A = 215) with Bismuth-215. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 132Isobar A = 215
80212Hg215Hg
81213Tl215Tl
82214Pb215Pb
83215Bi215Bi
84216Po215Po
85217At215At
86218Rn215Rn
87219Fr215Fr
88220Ra215Ra
89221Ac215Ac
90222Th215Th
91223Pa215Pa
92224U215U
93225Np

 

External data and identifiers

Adopted Levels, Gammas:NuDat 215Bi

 


Category: Isotopes

Last update: 26.11.2022



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