Input interpretation
Am-239 (americium-239) | No-264 (nobelium-264)
Decay properties
| Am-239 | No-264 half-life | 11.9 h (11.796 to 12.004 h) | 60 s mean lifetime | 17.2 h (17.018 to 17.318 h) | 90 s decay constant | 1.62×10^-5 per second | 0.011 per second specific activity | 40800 TBq/g | 2.5×10^7 TBq/g width | 1.06×10^-20 eV | 8×10^-18 eV decay modes | ϵ (electron capture) | α (alpha emission) | α (alpha emission) | SF (spontaneous fission) final decay products | Pb-207 (100%) | Tl-205 (9×10^-10) | Pb-206 (8×10^-12) | Pb-208 (1×10^-14) |
Decay modes
Am-239
decay mode | ϵ (electron capture) branching ratio | 100% Q-value | 802.11 keV (kiloelectronvolts) daughter nuclide | Pu-239 decay mode | α (alpha emission) branching ratio | 1×10^-4 Q-value | 5.9224 MeV (megaelectronvolts) daughter nuclide | Np-235
No-264
decay mode | α (alpha emission) Q-value | 6.58 MeV (megaelectronvolts) daughter nuclide | Fm-260 decay mode | SF (spontaneous fission)
Radiation shielding
Radiation shielding
Decay chain
Am-239
Decay chain Am-239
No-264
Decay chain No-264
Mass properties
| Am-239 | No-264 atomic number (Z) | 95 | 102 mass number (A) | 239 | 264 neutron number | 144 | 162 atomic mass | 239.053024479 u (unified atomic mass units) | 264.112345 u (unified atomic mass units) mass excess | 49.391985 MeV (megaelectronvolts) | 104.649 MeV (megaelectronvolts) binding energy per nucleon | 7.553681 MeV (megaelectronvolts) | 7.373 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
| Am-239 | No-264 spin parity J^π | 5/2^- (atomic boson) | 0^+ (atomic boson) magnetic moment | (unknown) | 0 μ_N
Quantum properties