Input interpretation
Be-11 (beryllium-11)
Decay properties
half-life | 13.81 seconds (13.728 to 13.892 s) mean lifetime | 19.92 seconds (19.807 to 20.041 s) decay constant | 0.0502 per second specific activity | 2.743×10^9 TBq/g (terabecquerels per gram) width | 3.304×10^-17 eV (electronvolts) decay modes | β^- (electron emission) | β^-α (electron + delayed α) final decay products | B-11 (97%) | Li-7 (2.9%)
Decay modes
decay mode | β^- (electron emission) branching ratio | 97% Q-value | 11.50613 MeV (megaelectronvolts) daughter nuclide | B-11 decay mode | β^-α (electron + delayed α) branching ratio | 2.9% Q-value | 2.84101 MeV (megaelectronvolts) daughter nuclide | Li-7
Decay chain
Decay chain
Mass properties
atomic number (Z) | 4 mass number (A) | 11 neutron number | 7 atomic mass | 11.021657749 u (unified atomic mass units) mass excess | 20.174064 MeV (megaelectronvolts) binding energy per nucleon | 5.952822 MeV (megaelectronvolts)
Mass properties
Nearby isotopes
Nearby isotopes
Quantum properties
spin parity J^π | 1/2^+ (atomic fermion)
Quantum properties
Excitations
E_level | spin parity J^π | half-life τ_1/2 | width Δ 320.04 keV (kiloelectronvolts) | 1/2^- | 1.15×10^-13 seconds | 0.00397 eV (electronvolts) 1778 keV (kiloelectronvolts) | 3/2^+ or 5/2^+ (uncertain) | 4.56×10^-21 seconds | 100 keV (kiloelectronvolts) 2690 keV (kiloelectronvolts) | 1/2^+ or 3/2^+ or 5/2^+ (uncertain) | 2.28×10^-21 seconds | 200 keV (kiloelectronvolts) 3410 keV (kiloelectronvolts) | 1/2^+ or 3/2^+ or 5/2^+ (uncertain) | 3.65×10^-21 seconds | 125 keV (kiloelectronvolts) 3887 keV (kiloelectronvolts) | (unknown) | 4.6×10^-20 seconds | 10 keV (kiloelectronvolts) 3956 keV (kiloelectronvolts) | 3/2^- | 3×10^-20 seconds | 15 keV (kiloelectronvolts) 5240 keV (kiloelectronvolts) | (unknown) | 1×10^-20 seconds | 45 keV (kiloelectronvolts) 5860 keV (kiloelectronvolts) | (unknown) | 1.52×10^-21 seconds | 300 keV (kiloelectronvolts) 6510 keV (kiloelectronvolts) | (unknown) | 3.8×10^-21 seconds | 120 keV (kiloelectronvolts) 6705 keV (kiloelectronvolts) | (unknown) | 1.1×10^-20 seconds | 40 keV (kiloelectronvolts)