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Berkelium-243

Properties and data of the isotope 243Bk.

 

Berkelium-243 is the very short-lived, only artificially accessible radioisotope of the element Berkelium, whose atomic nucleus has 146 neutrons in addition to the element-specific 97 protons, resulting in a mass number of 243. 243Bk was the first nuclide of berkelium ever produced (1950). The synthesis succeeded by helium ion bombardment of americium.

See also: list of Berkelium isotopes.

 

General data

Name of the isotope:Berkelium-243; Bk-243Symbol:243BkMass number A:243Atomic number Z:97 (= number of protons)Neutrons N:146Isotopic mass:243.063006(5) u (atomic weight of Berkelium-243)Nuclide mass:243.0098013 u (calculated nuclear mass without electrons)Mass excess:58.68971 MeVMass defect:1.96109984 u (per nucleus)Nuclear binding energy:1826.75273436 MeV (per nucleus)
7.51750096 MeV (average binding energy per nucleon)
Separation energy:SN = 7.11(20) MeV (first neutron)
SP = 3.403(4) MeV (first proton)
Half-life:4.5(2) hDecay constant λ:4.185671380192 × 10-5 s-1Spin and parity:(3/2-)Year of discovery:1950

 

Radioactive Decay

Half-life T½ = 4.5(2) h (hours) respectively 1.6560 × 104 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
EE/β+243Cm99,85 %1,508(5) MeV
α239Am0,15 %6,874(4) MeV

 

Berkelium-243 radioactive decay chain

 

Parent Nuclides

Direct parent isotopes are: 247Es, 243Cf.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 146) and isobaric (same nucleon number A = 243) with Berkelium-243. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 146Isobar A = 243
87233Fr
88234Ra
89235Ac
90236Th
91237Pa
92238U
93239Np243Np
94240Pu243Pu
95241Am243Am
96242Cm243Cm
97243Bk243Bk
98244Cf243Cf
99245Es243Es
100246Fm243Fm
101247Md

 

External data and identifiers

Adopted Levels, Gammas:NuDat 243Bk

 

Literature and References

[1] - S. G. Thompson, A. Ghiorso, G. T. Seaborg:
The New Element Berkelium (Atomic Number 97).
In: Physical Review, (1950), DOI 10.1103/PhysRev.80.781.

 


Category: Isotopes

Last update: 26.11.2022



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