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Einsteinium-252

Properties and data of the isotope 252Es.


Contents

See also: list of Einsteinium isotopes.

 

General data

Name of the isotope:Einsteinium-252; Es-252Symbol:252Es or 25299EsMass number A:252 (= number of nucleons)Atomic number Z:99 (= number of protons)Neutrons N:153Isotopic mass:252.08298(5) u (atomic weight of Einsteinium-252)Nuclide mass:252.0286785 u (calculated nuclear mass without electrons)Mass excess:77.29537 MeVMass defect:2.017430316 u (per nucleus)Nuclear binding energy:1879.22423477 MeV (per nucleus)
7.45723903 MeV (average binding energy per nucleon)
Separation energy:SN = 5.29(5) MeV (first neutron)
SP = 4.13(5) MeV MeV (first proton)
Half-life:471.7(19) dDecay constant λ:1.700771001067 × 10-8 s-1Specific activity α:40643978329069 Bq g-1
1098.4859007856 Ci g-1
Spin and parity:
(nuclear angular momentum)
(5-)Year of discovery:1956

 

Radioactive Decay

Half-life T½ = 471.7(19) d respectively 4.0754880 × 107 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
α248Bk78(2) %6.79(5) MeV
EC252Cf22(2) %1.26(5) MeV

 

Parent Nuclides

Direct parent isotope is: 256Md.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Einsteinium
Isotopic mixture
252.082979905 u100 %
Isotope 252Es252.08298(5) u100 %471.7(19) d(5-)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 153) and isobaric (same nucleon number A = 252) with Einsteinium-252. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 153Isobar A = 252
94247Pu
95248Am
96249Cm252Cm
97250Bk252Bk
98251Cf252Cf
99252Es252Es
100253Fm252Fm
101254Md252Md
102255No252No
103256Lr252Lr
104257Rf
105258Db
106259Sg
107260Bh

 

External data and identifiers

Adopted Levels, Gammas:NuDat 252Es

 

Literature and References

[1] - Bernard G. Harvey et al.:
New Isotopes of Einsteinium.
In: Physical Review, (1956), DOI 10.1103/PhysRev.104.1315.

 


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Last update: 2023-04-20


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