Input interpretation
Am-241 (americium-241)
Decay properties
half-life | 432.5 years (431.73 to 433.25 yr) mean lifetime | 624 years (622.87 to 625 yr) decay constant | 5.081×10^-11 per second specific activity | 126.9 GBq/g (gigabecquerels per gram) width | 3.345×10^-26 eV (electronvolts) decay modes | α (alpha emission) | SF (spontaneous fission) | ^34Si (cluster emission) final decay products | Tl-205 (100%) | Pb-207 (7×10^-10%)
Critical properties
critical mass | 66 kg (kilograms) critical diameter | 21.5 cm (centimeters) (for a uniform sphere)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 5.63782 MeV (megaelectronvolts) daughter nuclide | Np-237 decay mode | SF (spontaneous fission) branching ratio | 4.3×10^-10% decay mode | ^34Si (cluster emission) branching ratio | 7.4×10^-14% daughter nuclide | Tl-207
Radiation shielding
lead | 17.5 µm water | 45.1 µm air | 41.1 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 95 mass number (A) | 241 neutron number | 146 atomic mass | 241.056829144 u (unified atomic mass units) mass excess | 52.936008 MeV (megaelectronvolts) binding energy per nucleon | 7.543272 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^- (atomic boson) magnetic moment | 1.61 μ_N electric quadrupole moment | 4.2 eb (electron barns)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 41.176 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 93.7 keV (kiloelectronvolts) | 9/2^- | (unknown) | (unknown) 157.5 keV (kiloelectronvolts) | 11/2^- | (unknown) | (unknown) 205.884 keV (kiloelectronvolts) | 5/2^+ | (unknown) | (unknown) 233.68 keV (kiloelectronvolts) | 13/2^- | (unknown) | (unknown) 235.2 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 239 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 273 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 273.2 keV (kiloelectronvolts) | 9/2^+ | (unknown) | (unknown) 319.8 keV (kiloelectronvolts) | 11/2^+ | (unknown) | (unknown)