Input interpretation
Am-242 (americium-242)
Decay properties
half-life | 16.019 hours (15.998 to 16.042 h) mean lifetime | 23.1 hours (23.081 to 23.142 h) decay constant | 1.2×10^-5 per second specific activity | 29900 TBq/g (terabecquerels per gram) width | 7.911×10^-21 eV (electronvolts) decay modes | β^- (electron emission) | ϵ (electron capture) final decay products | Pb-206 (100%) | Tl-205 (1.9×10^-8) | Pb-208 (2.6×10^-11) | W-184 (9×10^-14) | Yb-168 (2×10^-17) | Er-164 (2×10^-17) | Dy-160 (6×10^-19) | Dy-156 (4×10^-21) | Sm-144 (4×10^-22) | Ce-140 (4×10^-23) | Dy-164 (0) | Er-168 (0) | Gd-156 (0) | Hf-176 (0) | Hf-180 (0) | Sm-152 (0) | Yb-172 (0)
Critical properties
critical mass | 11.5 kg (kilograms) critical diameter | 12 cm (centimeters) (for a uniform sphere)
Decay modes
decay mode | β^- (electron emission) branching ratio | 82.7% Q-value | 664.467 keV (kiloelectronvolts) daughter nuclide | Cm-242 decay mode | ϵ (electron capture) branching ratio | 17.3% Q-value | 751.295 keV (kiloelectronvolts) daughter nuclide | Pu-242
Decay chain
Decay chain
Mass properties
atomic number (Z) | 95 mass number (A) | 242 neutron number | 147 atomic mass | 242.059549159 u (unified atomic mass units) mass excess | 55.469685 MeV (megaelectronvolts) binding energy per nucleon | 7.534984 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 1^- (atomic fermion) magnetic moment | 0.3879 μ_N electric quadrupole moment | -2.4 eb (electron barns)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 44.092 keV (kiloelectronvolts) | 0^- | (unknown) | (unknown) 48.6 keV (kiloelectronvolts) | 5^- | 4.45×10^9 seconds | 1.03×10^-25 eV (electronvolts) 52.7 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 75.82 keV (kiloelectronvolts) | 2^- | (unknown) | (unknown) 99 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown)