Input interpretation
Pr-121 (praseodymium-121)
Decay properties
half-life | 1.4 seconds (0 to 3 s) mean lifetime | 2 seconds (-0.5 to 5 s) decay constant | 0.5 per second specific activity | 2.5×10^9 TBq/g (terabecquerels per gram) width | 2.3×10^-16 eV (electronvolts) decay modes | p (proton emission) | β^+ (positron emission) | β^+p (positron + delayed proton) final decay products | Sb-121 (0) | Te-120 (0) | Sn-115 (0) | Sn-116 (0) | Sn-119 (0) | Sn-120 (0)
Decay modes
decay mode | p (proton emission) Q-value | 837 keV (kiloelectronvolts) daughter nuclide | Ce-120 decay mode | β^+ (positron emission) Q-value | 10.103 MeV (megaelectronvolts) daughter nuclide | Ce-121 decay mode | β^+p (positron + delayed proton) daughter nuclide | La-120
Decay chain
Decay chain
Mass properties
atomic number (Z) | 59 mass number (A) | 121 neutron number | 62 atomic mass | 120.955364 u (unified atomic mass units) mass excess | -41.579 MeV (megaelectronvolts) binding energy per nucleon | 8.033 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 3/2^- (atomic boson)
Quantum properties