钾的同位素
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钾（原子质量单位：39.0983(1)）共有28个同位素，其中有2个是稳定的。
图表
[编辑]| 符号 | Z | N | 同位素质量（u） [n 1][n 2] |
半衰期 [n 1][n 2][n 3] |
衰变 方式[2] |
衰变 产物 [n 4][n 5] |
原子核 自旋[n 1] |
相对丰度 （莫耳分率）[3][n 2] | |
|---|---|---|---|---|---|---|---|---|---|
| 激发能量[n 2] | |||||||||
| 31 K[4][5] |
19 | 12 | <10 ps | 3p | 28S | ||||
| 34K[6] | 19 | 15 | 33.998404(18) | p | 33Ar | ||||
| 35K | 19 | 16 | 34.988010(21) | 178(8) ms | β+ (99.63%) | 35Ar | 3/2+ | ||
| β+, p (.37%) | 34Cl | ||||||||
| 36K | 19 | 17 | 35.981292(8) | 342(2) ms | β+ (99.94%) | 36Ar | 2+ | ||
| β+, p (.048%) | 35Cl | ||||||||
| β+, α (.012%) | 32S | ||||||||
| 37K | 19 | 18 | 36.97337589(10) | 1.226(7) s | β+ | 37Ar | 3/2+ | ||
| 38K | 19 | 19 | 37.9690812(5) | 7.636(18) min | β+ | 38Ar | 3+ | ||
| 38m1K | 130.50(28) keV | 924.2(3) ms | 0+ | ||||||
| 38m2K | 3458.0(2) keV | 21.98(11) µs | (7+),(5+) | ||||||
| 39 K |
19 | 20 | 38.96370668(20) | 稳定 | 3/2+ | 0.932581(44) | |||
| 40 K [n 6][n 7] |
19 | 21 | 39.96399848(21) | 1.248(3)×109 y | β− (89.28%) | 40Ca | 4 | 1.17(1)×10−4 | |
| EC (10.72%) | 40Ar | ||||||||
| β+ (0.001%)[7] | |||||||||
| 40mK | 1643.639(11) keV | 336(12) ns | 0+ | ||||||
| 41K | 19 | 22 | 40.96182576(21) | 稳定 | 3/2+ | 0.067302(44) | |||
| 42K | 19 | 23 | 41.96240281(24) | 12.360(12) h | β− | 42Ca | 2 | ||
| 43K | 19 | 24 | 42.960716(10) | 22.3(1) h | β− | 43Ca | 3/2+ | ||
| 44K | 19 | 25 | 43.96156(4) | 22.13(19) min | β− | 44Ca | 2− | ||
| 45K | 19 | 26 | 44.960699(11) | 17.3(6) min | β− | 45Ca | 3/2+ | ||
| 46K | 19 | 27 | 45.961977(17) | 105(10) s | β− | 46Ca | 2(−) | ||
| 47K | 19 | 28 | 46.961678(9) | 17.50(24) s | β− | 47Ca | 1/2+ | ||
| 48K | 19 | 29 | 47.965514(26) | 6.8(2) s | β− (98.86%) | 48Ca | (2−) | ||
| β−, n (1.14%) | 47Ca | ||||||||
| 49K | 19 | 30 | 48.96745(8) | 1.26(5) s | β−, n (86%) | 48Ca | (3/2+) | ||
| β− (14%) | 49Ca | ||||||||
| 50K | 19 | 31 | 49.97278(30) | 472(4) ms | β− (71%) | 50Ca | (0−,1,2−) | ||
| β−, n (29%) | 49Ca | ||||||||
| 51K | 19 | 32 | 50.97638(54)# | 365(5) ms | β− (53%) | 51Ca | 3/2+# | ||
| β−, n (47%) | 50Ca | ||||||||
| 52K | 19 | 33 | 51.98261(75)# | 105(5) ms | β−, n (64%) | 51Ca | (2−)# | ||
| β−, 2n (21%) | 50Ca | ||||||||
| β− (15%) | 52Ca | ||||||||
| 53K | 19 | 34 | 52.98712(75)# | 30(5) ms | β−, n (67%) | 52Ca | (3/2+)# | ||
| β−, 2n (17%) | 51Ca | ||||||||
| β− (16%) | 53Ca | ||||||||
| 54K | 19 | 35 | 53.99420(97)# | 10(5) ms | β− (>99.9%) | 54Ca | 2−# | ||
| β−, n (<.1%) | 53Ca | ||||||||
| 55K | 19 | 36 | 54.99971(107)# | 3# ms | β− | 55Ca | 3/2+# | ||
| β−, n | 54Ca | ||||||||
| 56K | 19 | 37 | 56.00851(86)# | 1# ms | β− | 56Ca | 2−# | ||
| β−, n | 55Ca | ||||||||
| 57K[8][9] | 19 | 38 | β− | 57Ca | |||||
| 59K[9][n 8] | 19 | 40 | β− | 59Ca | |||||
- ^ 1.0 1.1 1.2 画上#号的数据代表没有经过实验的证明，仅为理论推测。
- ^ 2.0 2.1 2.2 2.3 用括号括起来的数据代表不确定性。
- ^ 半衰期超过5亿年的同位素以粗体表示。
- ^ 稳定的衰变产物以粗体表示。
- ^ 半衰期超过5亿年的衰变产物以粗斜体表示。
- ^ 用于钾－氩年代测定法
- ^ 原始放射性核素
- ^ 未确认的同位素
| ← | 同位素列表 | → |
| 氩的同位素 | 钾的同位素 | 钙的同位素 |
参考文献
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- ^ Engelkemeir, D. W.; Flynn, K. F.; Glendenin, L. E. Positron Emission in the Decay of K40. Physical Review. 1962, 126 (5): 1818 [2015-09-11]. Bibcode:1962PhRv..126.1818E. doi:10.1103/PhysRev.126.1818. （原始内容存档于2019-07-01）.
- ^ Neufcourt, L.; Cao, Y.; Nazarewicz, W.; Olsen, E.; Viens, F. Neutron drip line in the Ca region from Bayesian model averaging. Physical Review Letters. 2019, 122 (6): 062502–1–062502–6. Bibcode:2019PhRvL.122f2502N. PMID 30822058. S2CID 73508148. arXiv:1901.07632 . doi:10.1103/PhysRevLett.122.062502.
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- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
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