Input interpretation
Cf-256 (californium-256) | Sm-147 (samarium-147)
Natural abundance
Cf-256 | Sm-147 0% | 14.99%
Decay properties
| Cf-256 | Sm-147 half-life | 12.3 min (11 to 13.6 min) | 106 billion yr (104 to 108 Gyr) mean lifetime | 17.67 min (16 to 19.49 min) | 153 billion yr (151.3 to 154.7 Gyr) decay constant | 9.434×10^-4 per second | 2.07×10^-19 per second specific activity | 2.218×10^6 TBq/g | 849 Bq/g width | 6.18×10^-19 eV | 1.36×10^-34 eV decay modes | SF (spontaneous fission) | α (alpha emission) | 2β^- (double beta decay) | α (alpha emission) final decay products | Pb-204 (0%) | Pb-206 (0%) | Pb-208 (0%) | Hg-200 (0%) | Hg-204 (0%) | Nd-143 (100%)
Decay modes
Cf-256
decay mode | SF (spontaneous fission) branching ratio | 100% decay mode | α (alpha emission) branching ratio | 6.2×10^-7% Q-value | 5.558 MeV (megaelectronvolts) daughter nuclide | Cm-252 decay mode | 2β^- (double beta decay) Q-value | 1.553 MeV (megaelectronvolts) daughter nuclide | Fm-256
Sm-147
decay mode | α (alpha emission) branching ratio | 100% Q-value | 2.31046 MeV (megaelectronvolts) daughter nuclide | Nd-143
Radiation shielding
| Cf-256 lead | 6.24 µm water | 13.2 µm air | 11.9 mm
Decay chain
Cf-256
Decay chain Cf-256
Sm-147
Decay chain Sm-147
Mass properties
| Cf-256 | Sm-147 atomic number (Z) | 98 | 62 mass number (A) | 256 | 147 neutron number | 158 | 85 atomic mass | 256.09344 u (unified atomic mass units) | 146.914897923 u (unified atomic mass units) mass excess | 87.039 MeV (megaelectronvolts) | -79.272075 MeV (megaelectronvolts) binding energy per nucleon | 7.432 MeV (megaelectronvolts) | 8.280614 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Cf-256 | Sm-147 spin parity J^π | 0^+ (atomic boson) | 7/2^- (atomic fermion) magnetic moment | 0 μ_N | -0.8148 μ_N electric quadrupole moment | (unknown) | -0.26 eb (electron barns)
Quantum properties