Input interpretation
Mg-28 (magnesium-28)
Decay properties
half-life | 20.915 hours (20.9057 to 20.9243 h) mean lifetime | 30.175 hours (30.1607 to 30.1871 h) decay constant | 9.20556×10^-6 per second specific activity | 198104 TBq/g (terabecquerels per gram) width | 6.0594×10^-21 eV (electronvolts) decay modes | β^- (electron emission) final decay products | Si-28 (100%)
Decay mode
decay mode | β^- (electron emission) Q-value | 1.8318 MeV (megaelectronvolts) daughter nuclide | Al-28
Radiation shielding
lead | 1.32 mm portland concrete | 4.53 mm water | 8.88 mm air | 7.73 m
Decay chain
Decay chain
Mass properties
atomic number (Z) | 12 mass number (A) | 28 neutron number | 16 atomic mass | 27.983876825 u (unified atomic mass units) mass excess | -15.018641 MeV (megaelectronvolts) binding energy per nucleon | 8.272406 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 1473.4 keV (kiloelectronvolts) | 2^+ | 1.2×10^-12 seconds | 3.8×10^-4 eV (electronvolts) 3862.7 keV (kiloelectronvolts) | 0^+ | 5.5×10^-13 seconds | 8.3×10^-4 eV (electronvolts) 4020.2 keV (kiloelectronvolts) | 4^+ | 1.05×10^-13 seconds | 0.00435 eV (electronvolts) 4557 keV (kiloelectronvolts) | 2^+ | 3×10^-14 seconds | 0.015 eV (electronvolts) 4560.8 keV (kiloelectronvolts) | 1^+ | (unknown) | (unknown) 4878.6 keV (kiloelectronvolts) | 2^+ | 8×10^-14 seconds | 0.0057 eV (electronvolts) 5171.8 keV (kiloelectronvolts) | 3^- | 1.2×10^-13 seconds | 0.0038 eV (electronvolts) 5184.6 keV (kiloelectronvolts) | (unknown) | (unknown) | (unknown) 5192.7 keV (kiloelectronvolts) | 1^? | 2×10^-14 seconds | 0.023 eV (electronvolts) 5271.7 keV (kiloelectronvolts) | 1^+ | 1×10^-13 seconds | 0.00456 eV (electronvolts)