Table
| nuclide symbol |
Z(p) | N(n) | isotopic mass (u) |
half-life | decay mode(s) |
daughter isotope(s) |
nuclear spin |
|---|---|---|---|---|---|---|---|
| excitation energy | |||||||
| 231Am | 95 | 136 | 231.04556(32)# | 30# s | β+ | 231Pu | |
| α (rare) | 227Np | ||||||
| 232Am | 95 | 137 | 232.04659(32)# | 79(2) s | β+ (98%) | 232Pu | |
| α (2%) | 228Np | ||||||
| β+, SF (.069%) | (various) | ||||||
| 233Am | 95 | 138 | 233.04635(11)# | 3.2(8) min | β+ | 233Pu | |
| α | 229Np | ||||||
| 234Am | 95 | 139 | 234.04781(22)# | 2.32(8) min | β+ (99.95%) | 234Pu | |
| α (.04%) | 230Np | ||||||
| β+, SF (.0066%) | (various) | ||||||
| 235Am | 95 | 140 | 235.04795(13)# | 9.9(5) min | β+ | 235Pu | 5/2-# |
| α (rare) | 231Np | ||||||
| 236Am | 95 | 141 | 236.04958(11)# | 3.6(1) min | β+ | 236Pu | |
| α | 232Np | ||||||
| 237Am | 95 | 142 | 237.05000(6)# | 73.0(10) min | β+ (99.97%) | 237Pu | 5/2(-) |
| α (.025%) | 233Np | ||||||
| 238Am | 95 | 143 | 238.05198(5) | 98(2) min | β+ | 238Pu | 1+ |
| α (10−4%) | 234Np | ||||||
| 238mAm | 2500(200)# keV | 35(10) µs | |||||
| 239Am | 95 | 144 | 239.0530245(26) | 11.9(1) h | EC (99.99%) | 239Pu | (5/2)- |
| α (.01%) | 235Np | ||||||
| 239mAm | 2500(200) keV | 163(12) ns | (7/2+) | ||||
| 240Am | 95 | 145 | 240.055300(15) | 50.8(3) h | β+ | 240Pu | (3-) |
| α (1.9×10−4%) | 236Np | ||||||
| 241Am | 95 | 146 | 241.0568291(20) | 432.2(7) a | α | 237Np | 5/2- |
| CD (7.4×10−10%) | 207Tl, 34Si | ||||||
| SF (4.3×10−10%) | (various) | ||||||
| 241mAm | 2200(100) keV | 1.2(3) µs | |||||
| 242Am | 95 | 147 | 242.0595492(20) | 16.02(2) h | β- (82.7%) | 242Cm | 1- |
| EC (17.3%) | 242Pu | ||||||
| 242m1Am | 48.60(5) keV | 141(2) a | IT (99.54%) | 242Am | 5- | ||
| α (.46%) | 238Np | ||||||
| SF (1.5×10−8%) | (various) | ||||||
| 242m2Am | 2200(80) keV | 14.0(10) ms | (2+,3-) | ||||
| 243Am | 95 | 148 | 243.0613811(25) | 7,370(40) a | α | 239Np | 5/2- |
| SF (3.7×10−9%) | (various) | ||||||
| 244Am | 95 | 149 | 244.0642848(22) | 10.1(1) h | β- | 244Cm | (6-)# |
| 244mAm | 86.1(10) keV | 26(1) min | β- (99.96%) | 244Cm | 1+ | ||
| EC (.0361%) | 244Pu | ||||||
| 245Am | 95 | 150 | 245.066452(4) | 2.05(1) h | β- | 245Cm | (5/2)+ |
| 246Am | 95 | 151 | 246.069775(20) | 39(3) min | β- | 246Cm | (7-) |
| 246m1Am | 30(10) keV | 25.0(2) min | β- (99.99%) | 246Cm | 2(-) | ||
| IT (.01%) | 246Am | ||||||
| 246m2Am | ~2000 keV | 73(10) µs | |||||
| 247Am | 95 | 152 | 247.07209(11)# | 23.0(13) min | β- | 247Cm | (5/2)# |
| 248Am | 95 | 153 | 248.07575(22)# | 3# min | β- | 248Cm | |
| 249Am | 95 | 154 | 249.07848(32)# | 1# min | β- | 249Cm | |
Read more about this topic: Isotopes Of Americium
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