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Americium-246

Properties and data of the isotope 246Am.


Content

See also: list of Americium isotopes.

 

General data

Name of the isotope:Americium-246; Am-246Symbol:246Am or 24695AmMass number A:246 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:151Isotopic mass:246.069774(19) u (atomic weight of Americium-246)Nuclide mass:246.0176661 u (calculated nuclear mass without electrons)Mass excess:64.99406 MeVMass defect:1.982006356 u (per nucleus)Nuclear binding energy:1846.22702858 MeV (per nucleus)
7.50498792 MeV (average binding energy per nucleon)
Separation energy:SN = 4.978(18) MeV (first neutron)
SP = 5.473(22) MeV (first proton)
Half-life:39(3) minDecay constant λ:0.00029621674382904 s-1Specific activity α:7.251459172399 × 10+17 Bq g-1
19598538.303782 Ci g-1
Spin and parity:
(nuclear angular momentum)
(7-)Year of discovery:1955

 

Radioactive Decay

Half-life T½ = 39(3) min (minutes) respectively 2.340 × 103 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-246Cm100 %2.377(18) MeV

 

Parent Nuclides

Direct parent isotope is: 246Pu.

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
246m1Am25.0(2) min2(-)
246m2Am2000 keV73(10) ┬Ás

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 151) and isobaric (same nucleon number A = 246) with Americium-246. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 151Isobar A = 246
92242U
93244Np
94245Pu246Pu
95246Am246Am
96247Cm246Cm
97248Bk246Bk
98249Cf246Cf
99250Es246Es
100251Fm246Fm
101252Md246Md
102253No
103254Lr
104255Rf
105256Db

 

External data and identifiers

Adopted Levels, Gammas:NuDat 246Am

 


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Last update: 2020-10-23


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