Input interpretation
Cm-242 (curium-242)
Decay properties
half-life | 162.8 days (162.57 to 163.02 days) mean lifetime | 234.8 days (234.56 to 235.17 days) decay constant | 4.929×10^-8 per second specific activity | 122.6 TBq/g (terabecquerels per gram) width | 3.244×10^-23 eV (electronvolts) decay modes | α (alpha emission) | SF (spontaneous fission) | ^34Si (cluster emission) | 2β^+ (double beta decay) final decay products | Pb-206 (100%) | Tl-205 (1.9×10^-6%) | Pb-208 (2.6×10^-9%) | W-184 (9×10^-12%) | Yb-168 (2×10^-15%) | Er-164 (2×10^-15%) | Dy-160 (8×10^-17%) | Dy-156 (5×10^-19%) | Sm-144 (5×10^-20%) | Ce-140 (5×10^-21%) | Dy-164 (0%) | Er-168 (0%) | Gd-156 (0%) | Hf-176 (0%) | Hf-180 (0%) | Sm-152 (0%) | Yb-172 (0%)
Decay modes
decay mode | α (alpha emission) branching ratio | 100% Q-value | 6.21556 MeV (megaelectronvolts) daughter nuclide | Pu-238 decay mode | SF (spontaneous fission) branching ratio | 6.2×10^-6% decay mode | ^34Si (cluster emission) branching ratio | 1.1×10^-14% daughter nuclide | Pb-208 decay mode | 2β^+ (double beta decay) Q-value | -1.95757 MeV (megaelectronvolts) daughter nuclide | Pu-242
Radiation shielding
lead | 19.9 µm water | 52.5 µm air | 47.8 mm
Decay chain
Decay chain
Mass properties
atomic number (Z) | 96 mass number (A) | 242 neutron number | 146 atomic mass | 242.058835824 u (unified atomic mass units) mass excess | 54.805218 MeV (megaelectronvolts) binding energy per nucleon | 7.534497 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 0^+ (atomic boson) magnetic moment | 0 μ_N
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 42.13 keV (kiloelectronvolts) | 2^+ | (unknown) | (unknown) 137 keV (kiloelectronvolts) | 4^+ | (unknown) | (unknown) 288 keV (kiloelectronvolts) | 6^+ | (unknown) | (unknown) 2800 keV (kiloelectronvolts) | (unknown) | 1.8×10^-7 seconds | 2.53×10^-9 eV (electronvolts)