Isotopes of Dubnium
List of known isotopes of the element Dubnium.
| Isotope | t½ | % | Spin/parity | Radius | Isotopic mass | Discovery |
|---|---|---|---|---|---|---|
| 255Db | 1.6 ± s | syn. | — | — | 2.551·108 ±304 keV/c2 | 1976 |
| 256Db | 1.6 ± s | syn. | — | — | 2.561·108 ±201 keV/c2 | 2001 |
| 257Db | 2.3 ±2 s | syn. | (9/2+) | — | 2.571·108 ±176.7 keV/c2 | 1985 |
| 258Db | 4.3 ±5 s | syn. | (5+ 6+) | — | 2.581·108 ±98.61 keV/c2 | 1985 |
| 259Db | 0.51 ±16 s | syn. | 9/2+ | — | 2.591·108 ±60.85 keV/c2 | 2001 |
| 260Db | 1.52 ±13 s | syn. | — | — | 2.601·108 ±100 keV/c2 | 1970 |
| 261Db | 1.8 ±4 s | syn. | — | — | 2.611·108 ±118 keV/c2 | 1970 |
| 262Db | 35 ±5 s | syn. | — | — | 2.621·108 ±154 keV/c2 | 1971 |
| 263Db | 27 ± s | syn. | — | — | 2.631·108 ±180 keV/c2 | 1992 |
| 266Db | 0.4 ± h | syn. | — | — | 2.661·108 ±304 keV/c2 | 2007 |
| 267Db | 79 ± m | syn. | — | — | 2.671·108 ±402 keV/c2 | 2004 |
| 268Db | 28 ±3 h | syn. | — | — | 2.681·108 ±568 keV/c2 | 2004 |
| 270Db | 15 ± h | syn. | — | — | 2.701·108 ±617 keV/c2 | 2010 |
255DbDubnium-255
| Classification | z: 105; n: 150; m: 255 |
|---|---|
| Half life | 1.6 ± s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; spontaneous fission |
| Discovery | 1976 |
| Mass excess | 99,590 ±283 keV |
| Binding energy | 7,359 ±1 keV |
| Single-particle energy | 895 ±400 keV |
| Q value for electron capture | 5,266 ±335.9 keV |
256DbDubnium-256
| Classification | z: 105; n: 151; m: 256 |
|---|---|
| Half life | 1.6 ± s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; electron capture (EC); spontaneous fission |
| Discovery | 2001 |
| Mass excess | 100,200 ±187 keV |
| Binding energy | 7,359 ±1 keV |
| Single-particle energy | 1,320 ±260 keV |
| Neutron separation energy | 7,368 ±339 keV |
| Q value for electron capture | 6,076 ±187.8 keV |
257DbDubnium-257
| Classification | z: 105; n: 152; m: 257 |
|---|---|
| Half life | 2.3 ±2 s |
| Natural abundance | synthetic nuclide |
| Spin/parity | (9/2+) |
| Decay modes | α decay; spontaneous fission |
| Discovery | 1985 |
| Mass excess | 100,100 ±164.6 keV |
| Binding energy | 7,361 ±0.6406 keV |
| Single-particle energy | 1,356 ±165.5 keV |
| Neutron separation energy | 8,215 ±249 keV |
| Q value for electron capture | 4,287 ±164.9 keV |
258DbDubnium-258
| Classification | z: 105; n: 153; m: 258 |
|---|---|
| Half life | 4.3 ±5 s |
| Natural abundance | synthetic nuclide |
| Spin/parity | (5+ 6+) |
| Decay modes | α decay; electron capture + β⁺ decay |
| Discovery | 1985 |
| Mass excess | 101,500 ±91.85 keV |
| Binding energy | 7,359 ±0.356 keV |
| Single-particle energy | 1,647 ±92.49 keV |
| Neutron separation energy | 6,717 ±188.5 keV |
| Q value for electron capture | 5,163 ±93.25 keV |
| β⁻ decay energy | -3,788 ±423 keV |
259DbDubnium-259
| Classification | z: 105; n: 154; m: 259 |
|---|---|
| Half life | 0.51 ±16 s |
| Natural abundance | synthetic nuclide |
| Spin/parity | 9/2+ |
| Decay modes | α decay |
| Discovery | 2001 |
| Mass excess | 101,900 ±56.68 keV |
| Binding energy | 7,360 ±0.2189 keV |
| Single-particle energy | 1,642 ±58.92 keV |
| Neutron separation energy | 7,587 ±107.9 keV |
| Q value for electron capture | 3,624 ±91.63 keV |
| β⁻ decay energy | -4,528 ±190 keV |
| β⁻ decay energy with neutron | -11,380 ±416 keV |
260DbDubnium-260
| Classification | z: 105; n: 155; m: 260 |
|---|---|
| Half life | 1.52 ±13 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; spontaneous fission; electron capture (EC) |
| Discovery | 1970 |
| Mass excess | 103,600 ±93 keV |
| Binding energy | 7,357 keV |
| Single-particle energy | 1,983 ±118 keV |
| Neutron separation energy | 6,390 ±109 keV |
| Q value for electron capture | 4,525 ±220.5 keV |
| β⁻ decay energy | -2,875 ±95 keV |
| β⁻ decay energy with neutron | -10,920 ±204 keV |
261DbDubnium-261
| Classification | z: 105; n: 156; m: 261 |
|---|---|
| Half life | 1.8 ±4 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay; spontaneous fission |
| Discovery | 1970 |
| Mass excess | 104,300 ±110 keV |
| Binding energy | 7,357 keV |
| Single-particle energy | 2,129 ±228 keV |
| Neutron separation energy | 7,436 ±144 keV |
| Q value for electron capture | 2,989 ±128.1 keV |
| β⁻ decay energy | -3,697 ±112 keV |
| β⁻ decay energy with neutron | -10,320 ±112 keV |
262DbDubnium-262
| Classification | z: 105; n: 157; m: 262 |
|---|---|
| Half life | 35 ±5 s |
| Natural abundance | synthetic nuclide |
| Decay modes | α decay |
| Discovery | 1971 |
| Mass excess | 106,200 ±143 keV |
| Binding energy | 7,352 ±1 keV |
| Single-particle energy | 2,354 ±157 keV |
| Neutron separation energy | 6,126 ±181 keV |
| Q value for electron capture | 3,861 ±265.7 keV |
| β⁻ decay energy | -2,116 ±145 keV |
| β⁻ decay energy with neutron | -9,823 ±144 keV |
263DbDubnium-263
| Classification | z: 105; n: 158; m: 263 |
|---|---|
| Half life | 27 ± s |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; α decay |
| Discovery | 1992 |
| Mass excess | 107,100 ±168 keV |
| Binding energy | 7,352 ±1 keV |
| Single-particle energy | 2,571 ±280 keV |
| Neutron separation energy | 7,214 ±221 keV |
| Q value for electron capture | 2,353 ±227.2 keV |
| β⁻ decay energy | -3,085 ±193 keV |
| β⁻ decay energy with neutron | -9,330 ±170 keV |
266DbDubnium-266
| Classification | z: 105; n: 161; m: 266 |
|---|---|
| Half life | 0.4 ± h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; electron capture (EC); α decay |
| Discovery | 2007 |
| Mass excess | 112,700 ±283 keV |
| Binding energy | 7,339 ±1 keV |
| Single-particle energy | 3,239 ±458 keV |
| Neutron separation energy | 5,713 ±361 keV |
| β⁻ decay energy | -877 ±374 keV |
| β⁻ decay energy with neutron | -8,125 ±315 keV |
267DbDubnium-267
| Classification | z: 105; n: 162; m: 267 |
|---|---|
| Half life | 79 ± m |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; α decay |
| Discovery | 2004 |
| Mass excess | 114,000 ±374 keV |
| Binding energy | 7,337 ±1 keV |
| Single-particle energy | 3,411 ±557 keV |
| Neutron separation energy | 6,798 ±469 keV |
| Q value for electron capture | 570 ±685.9 keV |
| β⁻ decay energy | -1,792 ±457 keV |
| β⁻ decay energy with neutron | -7,675 ±447 keV |
268DbDubnium-268
| Classification | z: 105; n: 163; m: 268 |
|---|---|
| Half life | 28 ±3 h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; electron capture + β⁺ decay; α decay |
| Discovery | 2004 |
| Mass excess | 117,000 ±529 keV |
| Binding energy | 7,328 ±2 keV |
| Single-particle energy | 3,673 ±781 keV |
| Neutron separation energy | 5,026 ±648 keV |
| β⁻ decay energy | 260 ±707 keV |
| β⁻ decay energy with neutron | -6,818 ±590 keV |
270DbDubnium-270
| Classification | z: 105; n: 165; m: 270 |
|---|---|
| Half life | 15 ± h |
| Natural abundance | synthetic nuclide |
| Decay modes | spontaneous fission; α decay |
| Discovery | 2010 |
| Mass excess | 122,300 ±575 keV |
| Binding energy | 7,314 ±2 keV |
| Neutron separation energy | 4,823 ±848 keV |
| β⁻ decay energy | 966 ±735 keV |
| β⁻ decay energy with neutron | -5,367 ±683 keV |