Isotopes of Lawrencium
List of known isotopes of the element Lawrencium.
| Isotope | t½ | % | Spin/parity | Radius | Isotopic mass | Discovery |
|---|---|---|---|---|---|---|
| 252Lr | 0.33 ± s | syn. | — | — | 2.52·108 ±198 keV/c2 | 2001 |
| 253Lr | 0.57 ± s | syn. | (7/2-) | — | 2.53·108 ±176.6 keV/c2 | 1985 |
| 254Lr | 18.1 ±18 s | syn. | — | — | 2.54·108 ±98.02 keV/c2 | 1981 |
| 255Lr | 31.1 ±11 s | syn. | 1/2- | — | 2.55·108 ±19 keV/c2 | 1971 |
| 256Lr | 27.9 ±10 s | syn. | — | — | 2.56·108 ±89 keV/c2 | 1965 |
| 257Lr | 4 s | syn. | — | — | 2.57·108 ±47 keV/c2 | 1971 |
| 258Lr | 3.92 ±33 s | syn. | — | — | 2.581·108 ±109 keV/c2 | 1971 |
| 259Lr | 6.2 ±3 s | syn. | — | — | 2.591·108 ±76 keV/c2 | 1971 |
| 260Lr | 180 ±30 s | syn. | — | — | 2.601·108 ±134 keV/c2 | 1971 |
| 261Lr | 39 ±12 m | syn. | — | — | 2.611·108 ±215 keV/c2 | 1987 |
| 262Lr | 4 h | syn. | — | — | 2.621·108 ±215 keV/c2 | 1987 |
| 264Lr | 4.9 ± h | syn. | — | — | 2.641·108 ±468 keV/c2 | — |
| 266Lr | 11 ± h | syn. | — | — | 2.661·108 ±579 keV/c2 | 2014 |
252LrLawrencium-252
| Classification | z: 103; n: 149; m: 252 |
|---|---|
| Half life | 0.33 ± s |
| Natural abundance | synthetic nuclide |
| Decay modes | electron capture + β⁺ decay; α decay; spontaneous fission |
| Discovery | 2001 |
| Mass excess | 88,530 ±185 keV |
| Binding energy | 7,400 ±1 keV |
| Single-particle energy | 1,601 ±259 keV |
| Neutron separation energy | 7,364 ±272 keV |
| Q value for electron capture | 5,665 ±185.2 keV |
253LrLawrencium-253
| Classification | z: 103; n: 150; m: 253 |
|---|---|
| Half life | 0.57 ± s |
| Natural abundance | synthetic nuclide |
| Spin/parity | (7/2-) |
| Decay modes | α decay; spontaneous fission |
| Discovery | 1985 |
| Mass excess | 88,520 ±164.5 keV |
| Binding energy | 7,402 ±0.6503 keV |
| Single-particle energy | 1,636 ±164.7 keV |
| Neutron separation energy | 8,085 ±247 keV |
| Q value for electron capture | 4,164 ±164.6 keV |
| β⁻ decay energy | -5,118 ±442 keV |
254LrLawrencium-254
| Classification | z: 103; n: 151; m: 254 |
|---|---|
| Half life | 18.1 ±18 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture + β⁺ decay; spontaneous fission |
| Discovery | 1981 |
| Mass excess | 89,640 ±91.31 keV |
| Binding energy | 7,401 ±0.3595 keV |
| Single-particle energy | 2,001 ±91.57 keV |
| Neutron separation energy | 6,948 ±188.1 keV |
| Q value for electron capture | 4,922 ±91.82 keV |
| β⁻ decay energy | -3,555 ±298 keV |
| β⁻ decay energy with neutron | -12,070 ±420 keV |
255LrLawrencium-255
| Classification | z: 103; n: 152; m: 255 |
|---|---|
| Half life | 31.1 ±11 s |
| Natural abundance | synthetic nuclide |
| Spin/parity | 1/2- |
| Decay modes | α decay; electron capture (EC); spontaneous fission |
| Discovery | 1971 |
| Mass excess | 89,940 ±17.69 keV |
| Binding energy | 7,402 ±0.0694 keV |
| Single-particle energy | 2,064 ±20.16 keV |
| Neutron separation energy | 7,769 ±93.01 keV |
| Q value for electron capture | 3,135 ±22.59 keV |
| β⁻ decay energy | -4,382 ±182 keV |
| β⁻ decay energy with neutron | -11,330 ±284 keV |
256LrLawrencium-256
| Classification | z: 103; n: 153; m: 256 |
|---|---|
| Half life | 27.9 ±10 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture (EC); spontaneous fission |
| Discovery | 1965 |
| Mass excess | 91,740 ±82.9 keV |
| Binding energy | 7,398 ±0.3238 keV |
| Single-particle energy | 2,354 ±84.08 keV |
| Neutron separation energy | 6,272 ±84.77 keV |
| Q value for electron capture | 3,923 ±83.24 keV |
| β⁻ decay energy | -2,476 ±84.8 keV |
| β⁻ decay energy with neutron | -10,660 ±199 keV |
257LrLawrencium-257
| Classification | z: 103; n: 154; m: 257 |
|---|---|
| Half life | 4 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture (EC); spontaneous fission |
| Discovery | 1971 |
| Mass excess | 92,660 ±44 keV |
| Binding energy | 7,397 keV |
| Single-particle energy | 2,447 ±45 keV |
| Neutron separation energy | 7,153 ±94 keV |
| Q value for electron capture | 2,417 ±44.43 keV |
| β⁻ decay energy | -3,201 ±45 keV |
| β⁻ decay energy with neutron | -9,628 ±48 keV |
258LrLawrencium-258
| Classification | z: 103; n: 155; m: 258 |
|---|---|
| Half life | 3.92 ±33 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture (EC) |
| Discovery | 1971 |
| Mass excess | 94,780 ±102 keV |
| Binding energy | 7,392 keV |
| Single-particle energy | 2,754 ±102 keV |
| Neutron separation energy | 5,955 ±111 keV |
| Q value for electron capture | 3,305 ±142.8 keV |
| β⁻ decay energy | -1,562 ±103 keV |
| β⁻ decay energy with neutron | -9,156 ±102 keV |
259LrLawrencium-259
| Classification | z: 103; n: 156; m: 259 |
|---|---|
| Half life | 6.2 ±3 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; spontaneous fission |
| Discovery | 1971 |
| Mass excess | 95,850 ±71 keV |
| Binding energy | 7,390 keV |
| Single-particle energy | 2,916 ±123 keV |
| Neutron separation energy | 7,002 ±124 keV |
| Q value for electron capture | 1,771 ±71.28 keV |
| β⁻ decay energy | -2,516 ±101 keV |
| β⁻ decay energy with neutron | -8,565 ±73 keV |
260LrLawrencium-260
| Classification | z: 103; n: 157; m: 260 |
|---|---|
| Half life | 180 ±30 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture (EC) |
| Discovery | 1971 |
| Mass excess | 98,270 ±125 keV |
| Binding energy | 7,383 keV |
| Single-particle energy | 3,092 ±125 keV |
| Neutron separation energy | 5,645 ±144 keV |
| Q value for electron capture | 2,667 ±235.8 keV |
| β⁻ decay energy | -871 ±236 keV |
| β⁻ decay energy with neutron | -8,162 ±145 keV |
261LrLawrencium-261
| Classification | z: 103; n: 158; m: 261 |
|---|---|
| Half life | 39 ±12 m |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission |
| Discovery | 1987 |
| Mass excess | 99,550 ±200 keV |
| Binding energy | 7,381 ±1 keV |
| Single-particle energy | 3,341 ±283 keV |
| Neutron separation energy | 6,791 ±236 keV |
| β⁻ decay energy | -1,761 ±211 keV |
| β⁻ decay energy with neutron | -7,662 ±283 keV |
262LrLawrencium-262
| Classification | z: 103; n: 159; m: 262 |
|---|---|
| Half life | 4 h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; α decay; electron capture + β⁺ decay |
| Discovery | 1987 |
| Mass excess | 102,100 ±200 keV |
| Binding energy | 7,374 ±1 keV |
| Single-particle energy | 3,639 ±283 keV |
| Neutron separation energy | 5,523 ±283 keV |
| Q value for electron capture | 2,004 ±412.7 keV |
| β⁻ decay energy | -287 ±300 keV |
| β⁻ decay energy with neutron | -7,284 ±211 keV |
264LrLawrencium-264
| Classification | z: 103; n: 161; m: 264 |
|---|---|
| Half life | 4.9 ± h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission |
| Mass excess | 106,300 ±436 keV |
| Binding energy | 7,363 ±2 keV |
| Single-particle energy | 4,043 ±656 keV |
| Neutron separation energy | 5,366 ±490 keV |
| β⁻ decay energy | 300 ±566 keV |
| β⁻ decay energy with neutron | -6,453 ±462 keV |
266LrLawrencium-266
| Classification | z: 103; n: 163; m: 266 |
|---|---|
| Half life | 11 ± h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission |
| Discovery | 2014 |
| Mass excess | 111,600 ±539 keV |
| Binding energy | 7,349 ±2 keV |
| Neutron separation energy | 4,643 ±768 keV |
| β⁻ decay energy | 1,526 ±679 keV |
| β⁻ decay energy with neutron | -5,099 ±648 keV |