Input interpretation
Zr-81 (zirconium-81)
Decay properties
half-life | 5.5 seconds (5.03 to 5.97 s) mean lifetime | 7.9 seconds (7.31 to 8.6 s) decay constant | 0.13 per second specific activity | 9.4×10^8 TBq/g (terabecquerels per gram) width | 8.3×10^-17 eV (electronvolts) decay modes | β^+ (positron emission) | β^+p (positron + delayed proton) final decay products | Br-81 (100%) | Kr-80 (0.12%)
Decay modes
decay mode | β^+ (positron emission) branching ratio | 100% Q-value | 6.507 MeV (megaelectronvolts) daughter nuclide | Y-81 decay mode | β^+p (positron + delayed proton) branching ratio | 0.12% daughter nuclide | Sr-80
Decay chain
Decay chain
Mass properties
atomic number (Z) | 40 mass number (A) | 81 neutron number | 41 atomic mass | 80.937210026 u (unified atomic mass units) mass excess | -58.488484 MeV (megaelectronvolts) binding energy per nucleon | 8.407053 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 3/2^- (atomic fermion)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 167.3 keV (kiloelectronvolts) | 5/2^- | (unknown) | (unknown) 405.4 keV (kiloelectronvolts) | 7/2^- | (unknown) | (unknown) 697.9 keV (kiloelectronvolts) | 9/2^- | (unknown) | (unknown) 1065.5 keV (kiloelectronvolts) | 11/2^- | (unknown) | (unknown) 1466.8 keV (kiloelectronvolts) | 13/2^- | (unknown) | (unknown) 1960.1 keV (kiloelectronvolts) | 15/2^- | (unknown) | (unknown) 2455.6 keV (kiloelectronvolts) | 17/2^- | (unknown) | (unknown)