Input interpretation
Sb-137 (antimony-137)
Decay properties
half-life | 450 ms (milliseconds) (399.4 to 500.6 ms) mean lifetime | 649 ms (milliseconds) (576.6 to 722.1 ms) decay constant | 1.54 per second specific activity | 6.78×10^9 TBq/g (terabecquerels per gram) width | 1.01×10^-15 eV (electronvolts) decay modes | β^- (electron emission) | β^-n (electron + delayed neutron) final decay products | Xe-136 (50%) | Ba-137 (50%) | Ba-135 (0.64%) | Ba-136 (0)
Decay modes
decay mode | β^- (electron emission) branching ratio | 51% Q-value | 9.303 MeV (megaelectronvolts) daughter nuclide | Te-137 decay mode | β^-n (electron + delayed neutron) branching ratio | 49% Q-value | 6.096 MeV (megaelectronvolts) daughter nuclide | Te-136
Decay chain
Decay chain
Mass properties
atomic number (Z) | 51 mass number (A) | 137 neutron number | 86 atomic mass | 136.93531 u (unified atomic mass units) mass excess | -60.258 MeV (megaelectronvolts) binding energy per nucleon | 8.22 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 7/2^+ (atomic boson)
Quantum properties