Isotopes of Boron
List of known isotopes of the element Boron.
| Isotope | t½ | % | Spin/parity | Radius | Isotopic mass | Discovery |
|---|---|---|---|---|---|---|
| 7B | 801 ±20 keV | syn. | (3/2-) | — | 7.029·106 ±27 keV/c2 | 1967 |
| 8B | 770 ±3 ms | syn. | 2+ | — | 8.024·106 ±1.073 keV/c2 | 1950 |
| 9B | 0.54 ±21 keV | syn. | 3/2- | — | 9.013·106 ±0.969 keV/c2 | 1940 |
| 10B | stab. | 19.65 ±0.44 % | 3+ | 2.427 ±0.0499 fm | 1.001·107 ±0.016 keV/c2 | 1920 |
| 11B | stab. | 80.35 ±0.44 % | 3/2- | 2.406 ±0.0294 fm | 1.1·107 ±0.013 keV/c2 | 1920 |
| 12B | 20.2 ±2 ms | syn. | 1+ | — | 1.201·107 ±1.418 keV/c2 | 1935 |
| 13B | 17.33 ±17 ms | syn. | 3/2- | — | 1.301·107 ±1.073 keV/c2 | 1956 |
| 14B | 12.5 ±5 ms | syn. | 2- | — | 1.402·107 ±22.77 keV/c2 | 1966 |
| 15B | 9.93 ±7 ms | syn. | — | — | 1.503·107 ±22.57 keV/c2 | 1966 |
| 16B | 100 keV | syn. | — | — | 1.603·107 ±26.37 keV/c2 | 2000 |
| 17B | 5.08 ±5 ms | syn. | (3/2-) | — | 1.704·107 ±219.1 keV/c2 | 1973 |
| 18B | stab. | syn. | (2-) | — | 1.805·107 ±219.1 keV/c2 | 2010 |
| 19B | 2.92 ±13 ms | syn. | 3/2- | — | 1.906·107 ±564 keV/c2 | 1984 |
| 20B | 500 keV | syn. | (1- 2-) | — | 2.007·107 ±586.5 keV/c2 | 2018 |
| 21B | 600 keV | syn. | (3/2-) | — | 2.108·107 ±599.7 keV/c2 | 2018 |
7BBoron-7
| Classification | z: 5; n: 2; m: 7 |
|---|---|
| Half life | 801 ±20 keV |
| Natural abundance | synthetic nuclide |
| Spin/parity | (3/2-) |
| Decay modes | proton emission |
| Discovery | 1967 |
| Mass excess | 27,670 ±25.15 keV |
| Binding energy | 3,558 ±3.592 keV |
| Single-particle energy | -2,013 ±25.73 keV |
| Neutron separation energy | 27,710 ±2,003 keV |
| Q value for electron capture | 11,900 ±25.15 keV |
8BBoron-8
| Classification | z: 5; n: 3; m: 8 |
|---|---|
| Half life | 770 ±3 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | 2+ |
| Decay modes | electron capture + β⁺ decay; β⁺ decay + α decay |
| Discovery | 1950 |
| Mass excess | 22,920 ±1 keV |
| Binding energy | 4,717 ±0.125 keV |
| Single-particle energy | 136.3 ±1.002 keV |
| Neutron separation energy | 12,820 ±25.17 keV |
| Q value for electron capture | 17,970 ±1.001 keV |
| β⁻ decay energy | -12,150 ±18.27 keV |
| Magnetic dipole moment | 1.035 ±3·10-4 μN |
| Electric quadrupole moment | 0.0643 ±0.0014 b |
9BBoron-9
| Classification | z: 5; n: 4; m: 9 |
|---|---|
| Half life | 0.54 ±21 keV |
| Natural abundance | synthetic nuclide |
| Spin/parity | 3/2- |
| Decay modes | proton emission |
| Discovery | 1940 |
| Mass excess | 12,410 ±0.903 keV |
| Binding energy | 6,257 ±0.1003 keV |
| Single-particle energy | -185.9 ±0.9033 keV |
| Neutron separation energy | 18,570 ±1.347 keV |
| Q value for electron capture | 1,068 ±0.906 keV |
| β⁻ decay energy | -16,500 ±2.319 keV |
| β⁻ decay energy with neutron | -30,720 ±18.26 keV |
10BBoron-10
| Classification | z: 5; n: 5; m: 10 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | 19.65 ±0.44 % |
| Spin/parity | 3+ |
| Discovery | 1920 |
| Mass excess | 12,050 ±0.015 keV |
| Binding energy | 6,475 ±0.0015 keV |
| Single-particle energy | 6,586 ±0.0779 keV |
| Neutron separation energy | 8,437 ±0.9027 keV |
| Q value for electron capture | -556.9 ±0.082 keV |
| β⁻ decay energy | -3,649 ±0.0687 keV |
| β⁻ decay energy with neutron | -24,940 ±2.136 keV |
| Magnetic dipole moment | 1.8 ±8·10-7 μN |
| Electric quadrupole moment | 0.0846 ±2·10-4 b |
11BBoron-11
| Classification | z: 5; n: 6; m: 11 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | 80.35 ±0.44 % |
| Spin/parity | 3/2- |
| Discovery | 1920 |
| Mass excess | 8,667 ±0.012 keV |
| Binding energy | 6,927 ±0.0011 keV |
| Single-particle energy | 11,220 ±0.0818 keV |
| Neutron separation energy | 11,450 ±0.0192 keV |
| Q value for electron capture | -11,510 ±0.238 keV |
| β⁻ decay energy | -1,982 ±0.0608 keV |
| β⁻ decay energy with neutron | -15,110 ±0.0714 keV |
| Magnetic dipole moment | 2.688 ±1·10-6 μN |
| Electric quadrupole moment | 0.04059 ±1·10-4 b |
12BBoron-12
| Classification | z: 5; n: 7; m: 12 |
|---|---|
| Half life | 20.2 ±2 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | 1+ |
| Decay modes | β⁻ decay; β⁻ + α decay |
| Discovery | 1935 |
| Mass excess | 13,360 ±1.321 keV |
| Binding energy | 6,631 ±0.1101 keV |
| Single-particle energy | 14,090 ±1.342 keV |
| Neutron separation energy | 3,369 ±1.321 keV |
| Q value for electron capture | -11,710 ±2.321 keV |
| β⁻ decay energy | 13,360 ±1.321 keV |
| β⁻ decay energy with neutron | -5,352 ±1.322 keV |
| Magnetic dipole moment | 1.003 ±0.001 μN |
| Electric quadrupole moment | 0.0132 ±3·10-4 b |
13BBoron-13
| Classification | z: 5; n: 8; m: 13 |
|---|---|
| Half life | 17.33 ±17 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | 3/2- |
| Decay modes | β⁻ decay; β⁻ decay with neutron emission |
| Discovery | 1956 |
| Mass excess | 16,560 ±1 keV |
| Binding energy | 6,496 ±0.0769 keV |
| Single-particle energy | 15,800 ±2.154 keV |
| Neutron separation energy | 4,878 ±1.657 keV |
| Q value for electron capture | -17,100 ±10.22 keV |
| β⁻ decay energy | 13,430 ±1 keV |
| β⁻ decay energy with neutron | 8,490 ±1 keV |
| Magnetic dipole moment | 3.177 ±5·10-4 μN |
| Electric quadrupole moment | 0.0365 ±8·10-4 b |
14BBoron-14
| Classification | z: 5; n: 9; m: 14 |
|---|---|
| Half life | 12.5 ±5 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | 2- |
| Decay modes | β⁻ decay; β⁻ decay with neutron emission |
| Discovery | 1966 |
| Mass excess | 23,660 ±21.21 keV |
| Binding energy | 6,101 ±1.515 keV |
| Single-particle energy | 17,280 ±23.52 keV |
| Neutron separation energy | 969.5 ±21.23 keV |
| Q value for electron capture | -16,300 ±133.9 keV |
| β⁻ decay energy | 20,640 ±21.21 keV |
| β⁻ decay energy with neutron | 12,460 ±21.21 keV |
| Magnetic dipole moment | 1.185 ±0.005 μN |
| Electric quadrupole moment | 0.0297 ±8·10-4 b |
15BBoron-15
| Classification | z: 5; n: 10; m: 15 |
|---|---|
| Half life | 9.93 ±7 ms |
| Natural abundance | synthetic nuclide |
| Decay modes | β⁻ decay; β⁻ decay with neutron emission |
| Discovery | 1966 |
| Mass excess | 28,950 ±21.02 keV |
| Binding energy | 5,880 ±1.401 keV |
| Single-particle energy | 18,280 ±133.9 keV |
| Neutron separation energy | 2,777 ±29.87 keV |
| Q value for electron capture | -20,870 ±167.1 keV |
| β⁻ decay energy | 19,080 ±21.04 keV |
| β⁻ decay energy with neutron | 17,860 ±21.02 keV |
| Magnetic dipole moment | 2.659 ±0.015 μN |
| Electric quadrupole moment | 0.0379 ±0.0011 b |
16BBoron-16
| Classification | z: 5; n: 11; m: 16 |
|---|---|
| Half life | 100 keV |
| Natural abundance | synthetic nuclide |
| Decay modes | neutron emission |
| Discovery | 2000 |
| Mass excess | 37,110 ±24.56 keV |
| Binding energy | 5,507 ±1.535 keV |
| Single-particle energy | 20,000 ±167.6 keV |
| Neutron separation energy | -83.01 ±14.6 keV |
| Q value for electron capture | -20,340 ±167.6 keV |
| β⁻ decay energy | 23,410 ±24.82 keV |
| β⁻ decay energy with neutron | 19,160 ±24.57 keV |
17BBoron-17
| Classification | z: 5; n: 12; m: 17 |
|---|---|
| Half life | 5.08 ±5 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | (3/2-) |
| Decay modes | β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission |
| Discovery | 1973 |
| Mass excess | 43,710 ±204.1 keV |
| Binding energy | 5,269 ±12 keV |
| Single-particle energy | 21,010 ±262.9 keV |
| Neutron separation energy | 1,466 ±205.5 keV |
| β⁻ decay energy | 22,680 ±204.8 keV |
| β⁻ decay energy with neutron | 21,950 ±204.1 keV |
| Magnetic dipole moment | 2.55 ±0.02 μN |
| Electric quadrupole moment | 0.0385 ±0.0015 b |
18BBoron-18
| Classification | z: 5; n: 13; m: 18 |
|---|---|
| Half life | stable nuclide |
| Natural abundance | synthetic nuclide |
| Spin/parity | (2-) |
| Discovery | 2010 |
| Mass excess | 51,790 ±204.1 keV |
| Binding energy | 4,976 ±11.34 keV |
| Neutron separation energy | -5 ±5 keV |
| β⁻ decay energy | 26,870 ±206.3 keV |
| β⁻ decay energy with neutron | 22,680 ±204.9 keV |
19BBoron-19
| Classification | z: 5; n: 14; m: 19 |
|---|---|
| Half life | 2.92 ±13 ms |
| Natural abundance | synthetic nuclide |
| Spin/parity | 3/2- |
| Decay modes | β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission |
| Discovery | 1984 |
| Mass excess | 59,770 ±525.3 keV |
| Binding energy | 4,719 ±27.65 keV |
| Neutron separation energy | 93.7 ±563.6 keV |
| β⁻ decay energy | 27,350 ±534.4 keV |
| β⁻ decay energy with neutron | 26,770 ±526.2 keV |
20BBoron-20
| Classification | z: 5; n: 15; m: 20 |
|---|---|
| Half life | 500 keV |
| Natural abundance | synthetic nuclide |
| Spin/parity | (1- 2-) |
| Decay modes | neutron emission |
| Discovery | 2018 |
| Mass excess | 69,400 ±546.3 keV |
| Binding energy | 4,405 ±27.31 keV |
| Neutron separation energy | -1,560 ±150 keV |
| β⁻ decay energy | 31,890 ±593 keV |
| β⁻ decay energy with neutron | 28,910 ±555.1 keV |
21BBoron-21
| Classification | z: 5; n: 16; m: 21 |
|---|---|
| Half life | 600 keV |
| Natural abundance | synthetic nuclide |
| Spin/parity | (3/2-) |
| Decay modes | two-neutron emission |
| Discovery | 2018 |
| Mass excess | 78,380 ±558.6 keV |
| Binding energy | 4,152 ±26.6 keV |
| Neutron separation energy | -910 ±242 keV |
| β⁻ decay energy | 32,740 ±817 keV |
| β⁻ decay energy with neutron | 32,800 ±604.3 keV |