Input interpretation
As-76 (arsenic-76)
Decay properties
half-life | 26.261 hours (26.23 to 26.29 h) mean lifetime | 37.886 hours (37.83 to 37.94 h) decay constant | 7.3319×10^-6 per second specific activity | 58156 TBq/g (terabecquerels per gram) width | 3.3448×10^-21 eV (electronvolts) decay modes | β^- (electron emission) | ϵ (electron capture) final decay products | Se-76 (100%)
Decay modes
decay mode | β^- (electron emission) branching ratio | 100% Q-value | 2.962547 MeV (megaelectronvolts) daughter nuclide | Se-76 decay mode | ϵ (electron capture) branching ratio | 0.02% Q-value | 923.543 keV (kiloelectronvolts) daughter nuclide | Ge-76
Radiation shielding
lead | 2.08 mm portland concrete | 7.57 mm water | 14.9 mm air | 12.8 m
Decay chain
Decay chain
Mass properties
atomic number (Z) | 33 mass number (A) | 76 neutron number | 43 atomic mass | 75.922394021 u (unified atomic mass units) mass excess | -72.289504 MeV (megaelectronvolts) binding energy per nucleon | 8.682792 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 2^- (atomic fermion) magnetic moment | -0.906 μ_N electric quadrupole moment | 7 eb (electron barns)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 44.425 keV (kiloelectronvolts) | 1^+ | 1.84×10^-6 seconds | 2.48×10^-10 eV (electronvolts) 86.787 keV (kiloelectronvolts) | 1^+ | (unknown) | (unknown) 120.258 keV (kiloelectronvolts) | 1^+ | (unknown) | (unknown) 122.248 keV (kiloelectronvolts) | 1^- | (unknown) | (unknown) 165.048 keV (kiloelectronvolts) | 3^- | (unknown) | (unknown) 203.542 keV (kiloelectronvolts) | 0^+ or 1^+ (uncertain) | (unknown) | (unknown) 211.146 keV (kiloelectronvolts) | 4^- | (unknown) | (unknown) 264.807 keV (kiloelectronvolts) | 1^+ or 2^+ (uncertain) | (unknown) | (unknown) 280.302 keV (kiloelectronvolts) | 1^+ or 2^+ (uncertain) | (unknown) | (unknown) 286.017 keV (kiloelectronvolts) | 3^- or 4^- (uncertain) | (unknown) | (unknown)