Input interpretation
Pm-144 (promethium-144)
Decay properties
half-life | 363 days (348.6 to 377.5 days) mean lifetime | 523 days (502.9 to 544.4 days) decay constant | 2.21×10^-8 per second specific activity | 92.6 TBq/g (terabecquerels per gram) width | 1.45×10^-23 eV (electronvolts) decay modes | ϵ (electron capture) | e^+ (positron emission) final decay products | Ce-140 (100%)
Decay modes
decay mode | ϵ (electron capture) branching ratio | 100% Q-value | 2.33206 MeV (megaelectronvolts) daughter nuclide | Nd-144 decay mode | e^+ (positron emission) branching ratio | 8×10^-7 daughter nuclide | Nd-144
Decay chain
Decay chain
Mass properties
atomic number (Z) | 61 mass number (A) | 144 neutron number | 83 atomic mass | 143.912590843 u (unified atomic mass units) mass excess | -81.421106 MeV (megaelectronvolts) binding energy per nucleon | 8.305331 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 5^- (atomic fermion) magnetic moment | 1.69 μ_N
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 60.727 keV (kiloelectronvolts) | 4^- | (unknown) | (unknown) 66.64 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 80.03 keV (kiloelectronvolts) | 2^- | (unknown) | (unknown) 171.802 keV (kiloelectronvolts) | 6^- | (unknown) | (unknown) 195.433 keV (kiloelectronvolts) | 5^- | (unknown) | (unknown) 207.37 keV (kiloelectronvolts) | 4^- | (unknown) | (unknown) 232.401 keV (kiloelectronvolts) | 6^- | (unknown) | (unknown) 249.91 keV (kiloelectronvolts) | 1^- | (unknown) | (unknown) 279.286 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 363.25 keV (kiloelectronvolts) | 2^- | (unknown) | (unknown)