Isotopes of Americium

List of known isotopes of the element Americium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
²²³Am	5 ± ms	syn.	—	—	2.23·10⁸ ±322 keV/c²	2015
²²⁹Am	0.9 ± s	syn.	—	—	2.29·10⁸ ±114.1 keV/c²	2015
²³⁰Am	31 s	syn.	—	—	2.3·10⁸ ±153 keV/c²	2003
²³²Am	79 ±2 s	syn.	—	—	2.32·10⁸ ±322 keV/c²	1967
²³³Am	3.2 ±8 m	syn.	—	—	2.33·10⁸ ±123 keV/c²	2000
²³⁴Am	2.32 ±8 m	syn.	—	—	2.34·10⁸ ±172 keV/c²	1967
²³⁵Am	10.3 ±6 m	syn.	5/2-	—	2.35·10⁸ ±56.66 keV/c²	1996
²³⁶Am	3.6 ±2 m	syn.	5-	—	2.36·10⁸ ±127 keV/c²	1998
²³⁷Am	73.6 ±8 m	syn.	5/2(-)	—	2.37·10⁸ ±64 keV/c²	1970
²³⁸Am	98 ±2 m	syn.	1+	—	2.38·10⁸ ±63.24 keV/c²	1950
²³⁹Am	11.9 ±1 h	syn.	(5/2)-	—	2.39·10⁸ ±2.127 keV/c²	1949
²⁴⁰Am	50.8 ±3 h	syn.	(3-)	—	2.4·10⁸ ±14.84 keV/c²	1949
²⁴¹Am	432.6 ±6 a	syn.	5/2-	5.892 ±0.0042 fm	2.41·10⁸ ±1.195 keV/c²	1949
²⁴²Am	16.01 ±2 h	syn.	1-	—	2.42·10⁸ ±1.199 keV/c²	1949
²⁴³Am	7,364 ±22 a	syn.	5/2-	5.904 ±0.0035 fm	2.43·10⁸ ±1.49 keV/c²	1950
²⁴⁴Am	10.1 ±1 h	syn.	(6-)	—	2.44·10⁸ ±1.6 keV/c²	1950
²⁴⁵Am	2.05 ±1 h	syn.	(5/2)+	—	2.45·10⁸ ±2.024 keV/c²	1955
²⁴⁶Am	39 ±3 m	syn.	(7-)	—	2.46·10⁸ ±19 keV/c²	1955
²⁴⁷Am	23 ±13 m	syn.	(5/2)	—	2.47·10⁸ ±107 keV/c²	1967
²⁴⁸Am	stab.	syn.	—	—	2.48·10⁸ ±215 keV/c²	—

223AmAmericium-223

Classification	z: 95; n: 128; m: 223
Half life	5 ± ms
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	2015
Mass excess	42,700 ±300 keV
Binding energy	7,547 ±1 keV
Single-particle energy	-351 ±424 keV

Point at nuclide Decay chain of Americium-223

229AmAmericium-229

Classification	z: 95; n: 134; m: 229
Half life	0.9 ± s
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay
Discovery	2015
Mass excess	42,180 ±106.3 keV
Binding energy	7,562 ±0.4644 keV
Single-particle energy	1,216 ±108.8 keV
Neutron separation energy	8,741 ±227 keV
Q value for electron capture	4,785 ±122.4 keV

Point at nuclide Decay chain of Americium-229

230AmAmericium-230

Classification	z: 95; n: 135; m: 230
Half life	31 s
Natural abundance	synthetic nuclide
Decay modes	electron capture (EC); spontaneous fission
Discovery	2003
Mass excess	42,870 ±143 keV
Binding energy	7,562 ±1 keV
Single-particle energy	1,812 ±155 keV
Neutron separation energy	7,380 ±178 keV
Q value for electron capture	5,939 ±143.7 keV

Point at nuclide Decay chain of Americium-230

232AmAmericium-232

Classification	z: 95; n: 137; m: 232
Half life	79 ±2 s
Natural abundance	synthetic nuclide
Decay modes	electron capture (EC); α decay; electron capture + spontaneous fission
Discovery	1967
Mass excess	43,420 ±300 keV
Binding energy	7,564 ±1 keV
Single-particle energy	2,178 ±301 keV
Neutron separation energy	7,062 ±424 keV
Q value for electron capture	5,059 ±300.4 keV
β⁻ decay energy	-2,913 ±361 keV
β⁻ decay energy with neutron	-11,930 ±424 keV

Point at nuclide Decay chain of Americium-232

233AmAmericium-233

Classification	z: 95; n: 138; m: 233
Half life	3.2 ±8 m
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; α decay
Discovery	2000
Mass excess	43,280 ±114 keV
Binding energy	7,567 keV
Single-particle energy	2,365 ±115 keV
Neutron separation energy	8,206 ±321 keV
Q value for electron capture	3,233 ±126.2 keV
β⁻ decay energy	-4,008 ±140 keV
β⁻ decay energy with neutron	-11,120 ±231 keV

Point at nuclide Decay chain of Americium-233

234AmAmericium-234

Classification	z: 95; n: 139; m: 234
Half life	2.32 ±8 m
Natural abundance	synthetic nuclide
Decay modes	electron capture (EC); α decay
Discovery	1967
Mass excess	44,460 ±160 keV
Binding energy	7,564 ±1 keV
Single-particle energy	2,879 ±169 keV
Neutron separation energy	6,895 ±196 keV
Q value for electron capture	4,112 ±160.1 keV
β⁻ decay energy	-2,261 ±161 keV
β⁻ decay energy with neutron	-10,910 ±179 keV

Point at nuclide Decay chain of Americium-234

235AmAmericium-235

Classification	z: 95; n: 140; m: 235
Half life	10.3 ±6 m
Natural abundance	synthetic nuclide
Spin/parity	5/2-
Decay modes	electron capture (EC); α decay
Discovery	1996
Mass excess	44,620 ±52.78 keV
Binding energy	7,565 ±0.2246 keV
Single-particle energy	3,014 ±53.2 keV
Neutron separation energy	7,908 ±168 keV
Q value for electron capture	2,442 ±56.62 keV
β⁻ decay energy	-3,389 ±115 keV
β⁻ decay energy with neutron	-10,170 ±55.45 keV

Point at nuclide Decay chain of Americium-235

236AmAmericium-236

Classification	z: 95; n: 141; m: 236
Half life	3.6 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	5-
Decay modes	electron capture (EC); α decay
Discovery	1998
Mass excess	46,040 ±119 keV
Binding energy	7,561 ±1 keV
Single-particle energy	3,431 ±121 keV
Neutron separation energy	6,655 ±130 keV
Q value for electron capture	3,139 ±119 keV
β⁻ decay energy	-1,812 ±120 keV
β⁻ decay energy with neutron	-10,050 ±157 keV

Point at nuclide Decay chain of Americium-236

237AmAmericium-237

Classification	z: 95; n: 142; m: 237
Half life	73.6 ±8 m
Natural abundance	synthetic nuclide
Spin/parity	5/2(-)
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1970
Mass excess	46,570 ±59 keV
Binding energy	7,561 keV
Single-particle energy	3,621 ±59 keV
Neutron separation energy	7,542 ±133 keV
Q value for electron capture	1,478 ±59.02 keV
β⁻ decay energy	-2,677 ±95 keV
β⁻ decay energy with neutron	-9,354 ±62 keV

Point at nuclide Decay chain of Americium-237

238AmAmericium-238

Classification	z: 95; n: 143; m: 238
Half life	98 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1950
Mass excess	48,420 ±58.91 keV
Binding energy	7,555 ±0.2475 keV
Single-particle energy	3,959 ±58.91 keV
Neutron separation energy	6,220 ±84 keV
Q value for electron capture	2,258 ±58.92 keV
β⁻ decay energy	-1,024 ±60.15 keV
β⁻ decay energy with neutron	-8,898 ±94.89 keV

Point at nuclide Decay chain of Americium-238

239AmAmericium-239

Classification	z: 95; n: 144; m: 239
Half life	11.9 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	(5/2)-
Decay modes	electron capture (EC); α decay
Discovery	1949
Mass excess	49,390 ±1.982 keV
Binding energy	7,553 ±0.0083 keV
Single-particle energy	4,061 ±1.673 keV
Neutron separation energy	7,102 ±58.92 keV
Q value for electron capture	802.1 ±2.27 keV
β⁻ decay energy	-1,757 ±150 keV
β⁻ decay energy with neutron	-8,127 ±12.34 keV

Point at nuclide Decay chain of Americium-239

240AmAmericium-240

Classification	z: 95; n: 145; m: 240
Half life	50.8 ±3 h
Natural abundance	synthetic nuclide
Spin/parity	(3-)
Decay modes	electron capture (EC); α decay
Discovery	1949
Mass excess	51,510 ±13.83 keV
Binding energy	7,547 ±0.0576 keV
Single-particle energy	4,367 ±13.79 keV
Neutron separation energy	5,951 ±13.88 keV
Q value for electron capture	1,384 ±13.87 keV
β⁻ decay energy	-214.2 ±13.89 keV
β⁻ decay energy with neutron	-7,709 ±150.6 keV

Point at nuclide Decay chain of Americium-240

241AmAmericium-241

Classification	z: 95; n: 146; m: 241
Half life	432.6 ±6 a
Natural abundance	synthetic nuclide
Spin/parity	5/2-
Decay modes	α decay; spontaneous fission
Discovery	1949
Mass excess	52,930 ±1.113 keV
Binding energy	7,543 ±0.0046 keV
Single-particle energy	4,479 ±0.1685 keV
Neutron separation energy	6,647 ±13.78 keV
Q value for electron capture	-20.78 ±1.56 keV
β⁻ decay energy	-767.5 ±1.168 keV
β⁻ decay energy with neutron	-6,862 ±1.741 keV
Magnetic dipole moment	1.6 ±0.01 μN
Electric quadrupole moment	4.34 ±0.05 b

Point at nuclide Decay chain of Americium-241

242AmAmericium-242

Classification	z: 95; n: 147; m: 242
Half life	16.01 ±2 h
Natural abundance	synthetic nuclide
Spin/parity	1-
Decay modes	β⁻ decay; electron capture (EC); α decay
Discovery	1949
Mass excess	55,460 ±1.118 keV
Binding energy	7,534 ±0.0046 keV
Single-particle energy	4,776 ±0.1936 keV
Neutron separation energy	5,537 ±0.1 keV
Q value for electron capture	751.1 ±1.673 keV
β⁻ decay energy	664.3 ±0.4143 keV
β⁻ decay energy with neutron	-6,306 ±1.172 keV
Magnetic dipole moment	0.3854 ±0.0017 μN
Electric quadrupole moment	-2.44 ±0.03 b

Point at nuclide Decay chain of Americium-242

243AmAmericium-243

Classification	z: 95; n: 148; m: 243
Half life	7,364 ±22 a
Natural abundance	synthetic nuclide
Spin/parity	5/2-
Decay modes	α decay; spontaneous fission
Discovery	1950
Mass excess	57,170 ±1.388 keV
Binding energy	7,530 ±0.0057 keV
Single-particle energy	4,830 ±1.377 keV
Neutron separation energy	6,364 ±1.235 keV
Q value for electron capture	-579.6 ±2.896 keV
β⁻ decay energy	-6.931 ±1.569 keV
β⁻ decay energy with neutron	-5,701 ±1.245 keV
Magnetic dipole moment	1.52 ±0.01 μN
Electric quadrupole moment	4.32 ±0.06 b

Point at nuclide Decay chain of Americium-243

244AmAmericium-244

Classification	z: 95; n: 149; m: 244
Half life	10.1 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	(6-)
Decay modes	β⁻ decay
Discovery	1950
Mass excess	59,870 ±1.491 keV
Binding energy	7,521 ±0.0061 keV
Single-particle energy	5,164 ±2.629 keV
Neutron separation energy	5,367 ±1.579 keV
Q value for electron capture	73.11 ±2.78 keV
β⁻ decay energy	1,427 ±1 keV
β⁻ decay energy with neutron	-5,375 ±1.433 keV

Point at nuclide Decay chain of Americium-244

245AmAmericium-245

Classification	z: 95; n: 150; m: 245
Half life	2.05 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	(5/2)+
Decay modes	β⁻ decay
Discovery	1955
Mass excess	61,900 ±1.886 keV
Binding energy	7,515 ±0.0077 keV
Single-particle energy	5,194 ±2.933 keV
Neutron separation energy	6,050 ±1.902 keV
Q value for electron capture	-1,278 ±13.75 keV
β⁻ decay energy	895.8 ±1.549 keV
β⁻ decay energy with neutron	-4,623 ±1.618 keV

Point at nuclide Decay chain of Americium-245

246AmAmericium-246

Classification	z: 95; n: 151; m: 246
Half life	39 ±3 m
Natural abundance	synthetic nuclide
Spin/parity	(7-)
Decay modes	β⁻ decay
Discovery	1955
Mass excess	64,990 ±18 keV
Binding energy	7,505 keV
Single-particle energy	5,473 ±22 keV
Neutron separation energy	4,978 ±18 keV
Q value for electron capture	-400.8 ±23.42 keV
β⁻ decay energy	2,377 ±18 keV
β⁻ decay energy with neutron	-4,082 ±18 keV

Point at nuclide Decay chain of Americium-246

247AmAmericium-247

Classification	z: 95; n: 152; m: 247
Half life	23 ±13 m
Natural abundance	synthetic nuclide
Spin/parity	(5/2)
Decay modes	β⁻ decay
Discovery	1967
Mass excess	67,150 ±100 keV
Binding energy	7,499 keV
Single-particle energy	5,531 ±101 keV
Neutron separation energy	5,912 ±102 keV
Q value for electron capture	-2,057 ±223.6 keV
β⁻ decay energy	1,620 ±100 keV
β⁻ decay energy with neutron	-3,535 ±100 keV

Point at nuclide Decay chain of Americium-247

248AmAmericium-248

Classification	z: 95; n: 153; m: 248
Half life	stable nuclide
Natural abundance	synthetic nuclide
Mass excess	70,560 ±200 keV
Binding energy	7,487 ±1 keV
Single-particle energy	5,936 ±283 keV
Neutron separation energy	4,662 ±224 keV
β⁻ decay energy	3,170 ±200 keV
β⁻ decay energy with neutron	-3,042 ±200 keV

Point at nuclide

Isotopes of Americium

223AmAmericium-223ads_clickcall_splitdownload

229AmAmericium-229ads_clickcall_splitdownload

230AmAmericium-230ads_clickcall_splitdownload

232AmAmericium-232ads_clickcall_splitdownload

233AmAmericium-233ads_clickcall_splitdownload

234AmAmericium-234ads_clickcall_splitdownload

235AmAmericium-235ads_clickcall_splitdownload

236AmAmericium-236ads_clickcall_splitdownload

237AmAmericium-237ads_clickcall_splitdownload

238AmAmericium-238ads_clickcall_splitdownload

239AmAmericium-239ads_clickcall_splitdownload

240AmAmericium-240ads_clickcall_splitdownload

241AmAmericium-241ads_clickcall_splitdownload

242AmAmericium-242ads_clickcall_splitdownload

243AmAmericium-243ads_clickcall_splitdownload

244AmAmericium-244ads_clickcall_splitdownload

245AmAmericium-245ads_clickcall_splitdownload

246AmAmericium-246ads_clickcall_splitdownload

247AmAmericium-247ads_clickcall_splitdownload

248AmAmericium-248ads_clickdownload

223AmAmericium-223

229AmAmericium-229

230AmAmericium-230

232AmAmericium-232

233AmAmericium-233

234AmAmericium-234

235AmAmericium-235

236AmAmericium-236

237AmAmericium-237

238AmAmericium-238

239AmAmericium-239

240AmAmericium-240

241AmAmericium-241

242AmAmericium-242

243AmAmericium-243

244AmAmericium-244

245AmAmericium-245

246AmAmericium-246

247AmAmericium-247

248AmAmericium-248