フランシウム(Fr)は、安定同位体を持たないため標準原子量は定められない。
フランシウムの同位体のうち、アクチニウム系列に属する同位体は以下の別名でも知られている：
- アクチニウムK (actinium K) : 223Fr
一覧
| 同位体核種 | Z(p) | N(n) | 同位体質量 (u) | 半減期 | 核スピン数 | 天然存在比 | 天然存在比 (範囲) |
|---|---|---|---|---|---|---|---|
| 励起エネルギー | |||||||
| 199Fr | 87 | 112 | 199.00726(4) | 16(7) ms | 1/2+# | ||
| 200Fr | 87 | 113 | 200.00657(8) | 24(10) ms | 3+# | ||
| 200mFr | 60(110) keV | 650(210) ms | 10-# | ||||
| 201Fr | 87 | 114 | 201.00386(8) | 67(3) ms | (9/2-) | ||
| 202Fr | 87 | 115 | 202.00337(5) | 290(30) ms | (3+) | ||
| 202mFr | 330(90)# keV | 340(40) ms | (10-) | ||||
| 203Fr | 87 | 116 | 203.000925(17) | 0.55(2) s | (9/2-)# | ||
| 204Fr | 87 | 117 | 204.000653(26) | 1.7(3) s | (3+) | ||
| 204m1Fr | 50(4) keV | 2.6(3) s | (7+) | ||||
| 204m2Fr | 326(4) keV | 1.7(6) s | (10-) | ||||
| 205Fr | 87 | 118 | 204.998594(8) | 3.80(3) s | (9/2-) | ||
| 206Fr | 87 | 119 | 205.99867(3) | ~16 s | (2+,3+) | ||
| 206m1Fr | 190(40) keV | 15.9(1) s | (7+) | ||||
| 206m2Fr | 730(40) keV | 700(100) ms | (10-) | ||||
| 207Fr | 87 | 120 | 206.99695(5) | 14.8(1) s | 9/2- | ||
| 208Fr | 87 | 121 | 207.99714(5) | 59.1(3) s | 7+ | ||
| 209Fr | 87 | 122 | 208.995954(16) | 50.0(3) s | 9/2- | ||
| 210Fr | 87 | 123 | 209.996408(24) | 3.18(6) min | 6+ | ||
| 211Fr | 87 | 124 | 210.995537(23) | 3.10(2) min | 9/2- | ||
| 212Fr | 87 | 125 | 211.996202(28) | 20.0(6) min | 5+ | ||
| 213Fr | 87 | 126 | 212.996189(8) | 34.6(3) s | 9/2- | ||
| 214Fr | 87 | 127 | 213.998971(9) | 5.0(2) ms | (1-) | ||
| 214m1Fr | 123(6) keV | 3.35(5) ms | (8-) | ||||
| 214m2Fr | 638(6) keV | 103(4) ns | (11+) | ||||
| 214m3Fr | 6477+Y keV | 108(7) ns | (33+) | ||||
| 215Fr | 87 | 128 | 215.000341(8) | 86(5) ns | 9/2- | ||
| 216Fr | 87 | 129 | 216.003198(15) | 0.70(2) µs | (1-) | ||
| 217Fr | 87 | 130 | 217.004632(7) | 16.8(19) µs | 9/2- | ||
| 218Fr | 87 | 131 | 218.007578(5) | 1.0(6) ms | 1- | ||
| 218m1Fr | 86(4) keV | 22.0(5) ms | |||||
| 218m2Fr | 200(150)# keV | high | |||||
| 219Fr | 87 | 132 | 219.009252(8) | 20(2) ms | 9/2- | ||
| 220Fr | 87 | 133 | 220.012327(4) | 27.4(3) s | 1+ | ||
| 221Fr | 87 | 134 | 221.014255(5) | 4.9(2) min | 5/2- | ||
| 222Fr | 87 | 135 | 222.017552(23) | 14.2(3) min | 2- | ||
| 223Fr | 87 | 136 | 223.0197359(26) | 22.00(7) min | 3/2(-) | ||
| 224Fr | 87 | 137 | 224.02325(5) | 3.33(10) min | 1- | ||
| 225Fr | 87 | 138 | 225.02557(3) | 4.0(2) min | 3/2- | ||
| 226Fr | 87 | 139 | 226.02939(11) | 49(1) s | 1- | ||
| 227Fr | 87 | 140 | 227.03184(11) | 2.47(3) min | 1/2+ | ||
| 228Fr | 87 | 141 | 228.03573(22)# | 38(1) s | 2- | ||
| 229Fr | 87 | 142 | 229.03845(4) | 50.2(4) s | (1/2+)# | ||
| 230Fr | 87 | 143 | 230.04251(48)# | 19.1(5) s | |||
| 231Fr | 87 | 144 | 231.04544(50)# | 17.6(6) s | (1/2+)# | ||
| 232Fr | 87 | 145 | 232.04977(69)# | 5(1) s | |||
参考文献
- Isotope masses from by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.