Input interpretation
Na-31 (sodium-31) | Ba-149 (barium-149)
Decay properties
| Na-31 | Ba-149 half-life | 17 ms (16.4 to 17.6 ms) | 344 ms (336.4 to 351.6 ms) mean lifetime | 25 ms (23.8 to 25.3 ms) | 496 ms (485.8 to 506.7 ms) decay constant | 40 per second | 2.02 per second specific activity | 7.8×10^11 TBq/g | 8.15×10^9 TBq/g width | 2.7×10^-14 eV | 1.33×10^-15 eV decay modes | β^- (electron emission) | β^-n (electron + delayed neutron) | β^-2n (electron + delayed 2 neutrons) | β^-3n (electron + delayed 3 neutrons) | β^- (electron emission) | β^-n (electron + delayed neutron) final decay products | P-31 (60%) | Si-30 (42%) | Si-29 (0.9%) | Si-28 (0.05%) | Sm-149 (100%) | Nd-148 (1.8%) | Nd-143 (6×10^-4%) | Ce-140 (0%) | Nd-145 (0%)
Decay modes
Na-31
decay mode | β^- (electron emission) branching ratio | 62% Q-value | 15.872 MeV (megaelectronvolts) daughter nuclide | Mg-31 decay mode | β^-n (electron + delayed neutron) branching ratio | 37% Q-value | 13.494 MeV (megaelectronvolts) daughter nuclide | Mg-30 decay mode | β^-2n (electron + delayed 2 neutrons) branching ratio | 0.9% Q-value | 7.131 MeV (megaelectronvolts) daughter nuclide | Mg-29 decay mode | β^-3n (electron + delayed 3 neutrons) branching ratio | 0.05% daughter nuclide | Mg-28
Ba-149
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 7.309 MeV (megaelectronvolts) daughter nuclide | La-149 decay mode | β^-n (electron + delayed neutron) branching ratio | 0.43% Q-value | 1.571 MeV (megaelectronvolts) daughter nuclide | La-148
Radiation shielding
| Na-31 lead | 4.34 mm portland concrete | 18.3 mm water | 37 mm air | 30.7 m
Decay chain
Na-31
Decay chain Na-31
Ba-149
Decay chain Ba-149
Mass properties
| Na-31 | Ba-149 atomic number (Z) | 11 | 56 mass number (A) | 31 | 149 neutron number | 20 | 93 atomic mass | 31.013585452 u (unified atomic mass units) | 148.94258 u (unified atomic mass units) mass excess | 12.654768 MeV (megaelectronvolts) | -53.486 MeV (megaelectronvolts) binding energy per nucleon | 7.385492 MeV (megaelectronvolts) | 8.136 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Na-31 | Ba-149 spin parity J^π | 3/2^+ (atomic boson) | 3/2^- (atomic fermion) magnetic moment | 2.305 μ_N | (unknown)
Quantum properties