Americium-242m2
Properties and data of the isotope 242m2Am.
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) keVNuclide 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-1Spin 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 | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso ? | 242Am | ? % | | |
SZ | div | ca. 100 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
242Am | | 16.02(2) h | 1- |
242m1Am | 48.60(5) keV | 141(2) a | 5- |
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.
Z | Isotone N = 147 | Isobar A = 242 |
89 | 236Ac | |
90 | 237Th | |
91 | 238Pa | |
92 | 239U | 242U |
93 | 240Np | 242Np |
94 | 241Pu | 242Pu |
95 | 242Am | 242Am |
96 | 243Cm | 242Cm |
97 | 244Bk | 242Bk |
98 | 245Cf | 242Cf |
99 | 246Es | 242Es |
100 | 247Fm | 242Fm |
101 | 248Md | |
External data and identifiers
Last update: 2020-10-23
Perma link: https://www.chemlin.org/isotope/americium-242m2
© 1996 - 2024 ChemLin