Input interpretation
Ac-223 (actinium-223)
Decay properties
half-life | 126 seconds (120 to 132 s) mean lifetime | 182 seconds (171 to 193 s) decay constant | 0.0055 per second specific activity | 1.49×10^7 TBq/g (terabecquerels per gram) width | 2.51×10^-18 eV (electronvolts) decay modes | α (alpha emission) | ϵ (electron capture) final decay products | Pb-207 (100%) | Tl-205 (9×10^-12)
Decay modes
decay mode | α (alpha emission) branching ratio | 99% Q-value | 6.7832 MeV (megaelectronvolts) daughter nuclide | Fr-219 decay mode | ϵ (electron capture) branching ratio | 1% Q-value | 591.78 keV (kiloelectronvolts) daughter nuclide | Ra-223
Decay chain
Decay chain
Mass properties
atomic number (Z) | 89 mass number (A) | 223 neutron number | 134 atomic mass | 223.019137468 u (unified atomic mass units) mass excess | 17.826437 MeV (megaelectronvolts) binding energy per nucleon | 7.679141 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5/2^- (atomic boson)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 12.5 keV (kiloelectronvolts) | 3/2^- | (unknown) | (unknown) 42.4 keV (kiloelectronvolts) | 7/2^- | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 50.7 keV (kiloelectronvolts) | 5/2^- | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 64.62 keV (kiloelectronvolts) | 5/2^+ | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 90.7 keV (kiloelectronvolts) | 9/2^- | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 107.2 keV (kiloelectronvolts) | 7/2^- | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 110.06 keV (kiloelectronvolts) | 7/2^+ | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts) 130.7 keV (kiloelectronvolts) | 7/2^+ | (unknown) | (unknown) 141 keV (kiloelectronvolts) | 11/2^- | (unknown) | (unknown) 167.5 keV (kiloelectronvolts) | 9/2^+ | 2.5×10^-10 seconds | 1.8×10^-6 eV (electronvolts)