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Americium-242m2

Properties and data of the isotope 242m2Am.


Contents

See also: list of Americium isotopes.

 

General data

Name of the isotope:Americium-242m2; Am-242m2Symbol:242m2Am or 242m295AmMass number A:242 (= number of nucleons)Atomic number Z:95 (= number of protons)Neutrons N:147Isotopic mass:242.0595474(12) u (atomic weight of Americium-242m2)
Excitation energy: 2200(80) keV
Nuclide mass:242.0074395 u (calculated nuclear mass without electrons)Mass excess:55.46805 MeVMass defect:1.957573292 u (per nucleus)Nuclear binding energy:1823.46777606 MeV (per nucleus)
7.53499081 MeV (average binding energy per nucleon)
Half-life:14.0(10) msDecay constant λ:49.510512897139 s-1Specific activity α:1.232063151711 × 10+23 Bq g-1
3329900410032.2 Ci g-1
Spin and parity:
(nuclear angular momentum)
(2+.3-)Magnetic dipole moment:μ(μN) = - 1.14

 

Radioactive Decay

Half-life T½ = 14.0(10) ms respectively 1.40 × 10-2 seconds s.

Decay
mode
DaughterProbabilityDecay energyγ energy
(intensity)
Iso ?242Am? %
SZdivca. 100 %

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
242Am16.02(2) h1-
242m1Am48.60(5) keV141(2) a5-

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 147) and isobaric (same nucleon number A = 242) with Americium-242m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 147Isobar A = 242
89236Ac
90237Th
91238Pa
92239U242U
93240Np242Np
94241Pu242Pu
95242Am242Am
96243Cm242Cm
97244Bk242Bk
98245Cf242Cf
99246Es242Es
100247Fm242Fm
101248Md

 

External data and identifiers

Adopted Levels, Gammas:NuDat 242Am

 


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Last update: 2020-10-23


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