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Americium-235

Properties and data of the isotope 235Am.

 

Americium-235 is the artificial radioisotope of the element Americium, whose atomic nucleus has 140 neutrons in addition to the element-specific 95 protons, resulting in a mass number of 235: 235Am.

See also: list of Americium isotopes.

 

General data

Name of the isotope:Americium-235; Am-235Symbol:235AmMass number A:235Atomic number Z:95 (= number of protons)Neutrons N:140Isotopic mass:235.04791(6) u (atomic weight of Americium-235)Nuclide mass:234.9958021 u (calculated nuclear mass without electrons)Mass excess:44.62788 MeVMass defect:1.90855628 u (per nucleus)Nuclear binding energy:1777.80872348 MeV (per nucleus)
7.5651435 MeV (average binding energy per nucleon)
Separation energy:SN = 7.91(17) MeV (first neutron)
SP = 3.01(5) MeV (first proton)
Half-life:10.3(6) minDecay constant λ:0.0011215973795468 s-1Spin and parity:5/2-Year of discovery:1996

 

Radioactive Decay

Half-life T½ = 10.3(6) min (minutes) respectively 6.18 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
α231Np0,40(5) %6,576(13) MeV
ε235Pu99,60(5) %2,44(6) MeV

 

Americium-235 radioactive decay

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 140) and isobaric (same nucleon number A = 235) with Americium-235. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 140Isobar A = 235
83223Bi
84224Po
85225At
86226Rn
87227Fr
88228Ra
89229Ac235Ac
90230Th235Th
91231Pa235Pa
92232U235U
93233Np235Np
94234Pu235Pu
95235Am235Am
96236Cm235Cm
97237Bk235Bk
98238Cf

 

External data and identifiers

Adopted Levels, Gammas:NuDat 235Am

 


Category: Isotopes

Last update: 26.11.2022



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