Input interpretation
He-8 (helium-8) | Ag-128 (silver-128)
Decay properties
| He-8 | Ag-128 half-life | 119 ms (117.4 to 120.6 ms) | 58 ms (45 to 71 ms) mean lifetime | 172 ms (169.4 to 174 ms) | 84 ms (75.7 to 91.7 ms) decay constant | 5.81 per second | 12 per second specific activity | 4.36×10^11 TBq/g | 5.6×10^10 TBq/g width | 3.83×10^-15 eV | 7.9×10^-15 eV decay modes | β^- (electron emission) | β^-n (electron + delayed neutron) | β^-t (electron + delayed triton) | β^- (electron emission) | β^-n (electron + delayed neutron) final decay products | He-4 (84%) | Li-7 (16%) | Xe-128 (100%) | I-127 (0.038%) | Te-126 (0%)
Decay modes
He-8
decay mode | β^- (electron emission) branching ratio | 83% Q-value | 10.6512 MeV (megaelectronvolts) daughter nuclide | Li-8 decay mode | β^-n (electron + delayed neutron) branching ratio | 16% Q-value | 8.61859 MeV (megaelectronvolts) daughter nuclide | Li-7 decay mode | β^-t (electron + delayed triton) branching ratio | 0.9% daughter nuclide | He-5
Ag-128
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 12.489 MeV (megaelectronvolts) daughter nuclide | Cd-128 decay mode | β^-n (electron + delayed neutron) Q-value | 5.646 MeV (megaelectronvolts) daughter nuclide | Cd-127
Radiation shielding
| He-8 lead | 6.26 mm portland concrete | 29.8 mm water | 61.1 mm air | 49.5 m
Decay chain
He-8
Decay chain He-8
Ag-128
Decay chain Ag-128
Mass properties
| He-8 | Ag-128 atomic number (Z) | 2 | 47 mass number (A) | 8 | 128 neutron number | 6 | 81 atomic mass | 8.033921897 u (unified atomic mass units) | 127.94117 u (unified atomic mass units) mass excess | 31.598044 MeV (megaelectronvolts) | -54.8 MeV (megaelectronvolts) binding energy per nucleon | 3.925975 MeV (megaelectronvolts) | 8.212 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| He-8 spin parity J^π | 0^+ (atomic boson) magnetic moment | 0 μ_N
Quantum properties