HomeTable of NuclidesEinsteiniumIsotopes

Isotopes of Einsteinium

List of known isotopes of the element Einsteinium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
²⁴⁰Es	6 ±2 s	syn.	(1+)	—	2.4·10⁸ ±393 keV/c²	2017
²⁴¹Es	8 ± s	syn.	—	—	2.41·10⁸ ±248 keV/c²	1996
²⁴²Es	17.8 ±16 s	syn.	—	—	2.42·10⁸ ±276 keV/c²	1994
²⁴³Es	21 ±2 s	syn.	(7/2+)	—	2.43·10⁸ ±222 keV/c²	1973
²⁴⁴Es	37 ±4 s	syn.	—	—	2.44·10⁸ ±195 keV/c²	1973
²⁴⁵Es	1.1 ±1 m	syn.	(3/2-)	—	2.45·10⁸ ±178 keV/c²	1967
²⁴⁶Es	7.5 ±5 m	syn.	—	—	2.46·10⁸ ±96.53 keV/c²	1954
²⁴⁷Es	stab.	syn.	(3/2-)	—	2.47·10⁸ ±20.87 keV/c²	1967
²⁴⁸Es	24 ±3 m	syn.	(2- 0+)	—	2.48·10⁸ ±56 keV/c²	1956
²⁴⁹Es	102.2 ±6 m	syn.	7/2+	—	2.49·10⁸ ±32 keV/c²	1956
²⁵⁰Es	8.6 ±1 h	syn.	(6+)	—	2.5·10⁸ ±107 keV/c²	1956
²⁵¹Es	33 ±1 h	syn.	3/2-	—	2.51·10⁸ ±5.676 keV/c²	1956
²⁵²Es	471.7 ±19 d	syn.	(5-)	—	2.52·10⁸ ±53.73 keV/c²	1956
²⁵³Es	20.47 ±3 d	syn.	7/2+	—	2.53·10⁸ ±1.341 keV/c²	1954
²⁵⁴Es	275.7 ±5 d	syn.	(7+)	—	2.54·10⁸ ±3.152 keV/c²	1954
²⁵⁵Es	39.8 ±12 d	syn.	(7/2+)	—	2.55·10⁸ ±11.61 keV/c²	1954
²⁵⁶Es	25.4 ±24 m	syn.	(1+ 0-)	—	2.56·10⁸ ±107 keV/c²	1976
²⁵⁷Es	7.7 ±2 d	syn.	—	—	2.57·10⁸ ±441 keV/c²	1987

240EsEinsteinium-240

Classification	z: 99; n: 141; m: 240
Half life	6 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	(1+)
Decay modes	α decay; electron capture + β⁺ decay; electron capture + spontaneous fission
Discovery	2017
Mass excess	64,220 ±366 keV
Binding energy	7,481 ±2 keV
Single-particle energy	1,265 ±385 keV
Neutron separation energy	7,476 ±473 keV
Q value for electron capture	6,236 ±366.4 keV

Point at nuclide Decay chain of Einsteinium-240

241EsEinsteinium-241

Classification	z: 99; n: 142; m: 241
Half life	8 ± s
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay
Discovery	1996
Mass excess	63,890 ±231 keV
Binding energy	7,485 ±1 keV
Single-particle energy	1,384 ±232 keV
Neutron separation energy	8,403 ±433 keV
Q value for electron capture	4,566 ±285 keV
β⁻ decay energy	-5,327 ±379 keV

Point at nuclide Decay chain of Einsteinium-241

242EsEinsteinium-242

Classification	z: 99; n: 143; m: 242
Half life	17.8 ±16 s
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay
Discovery	1994
Mass excess	64,800 ±257 keV
Binding energy	7,483 ±1 keV
Single-particle energy	1,814 ±307 keV
Neutron separation energy	7,163 ±345 keV
Q value for electron capture	5,414 ±257.3 keV
β⁻ decay energy	-3,598 ±476 keV
β⁻ decay energy with neutron	-12,490 ±395 keV

Point at nuclide Decay chain of Einsteinium-242

243EsEinsteinium-243

Classification	z: 99; n: 144; m: 243
Half life	21 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	α decay; electron capture + β⁺ decay; spontaneous fission
Discovery	1973
Mass excess	64,740 ±207 keV
Binding energy	7,486 ±1 keV
Single-particle energy	1,929 ±207 keV
Neutron separation energy	8,126 ±330 keV
Q value for electron capture	3,757 ±274.9 keV
β⁻ decay energy	-4,569 ±245 keV
β⁻ decay energy with neutron	-11,730 ±451 keV

Point at nuclide Decay chain of Einsteinium-243

244EsEinsteinium-244

Classification	z: 99; n: 145; m: 244
Half life	37 ±4 s
Natural abundance	synthetic nuclide
Decay modes	electron capture (EC); α decay
Discovery	1973
Mass excess	66,020 ±181 keV
Binding energy	7,483 ±1 keV
Single-particle energy	2,253 ±256 keV
Neutron separation energy	6,792 ±275 keV
Q value for electron capture	4,547 ±181 keV
β⁻ decay energy	-2,938 ±271 keV
β⁻ decay energy with neutron	-11,370 ±223 keV

Point at nuclide Decay chain of Einsteinium-244

245EsEinsteinium-245

Classification	z: 99; n: 146; m: 245
Half life	1.1 ±1 m
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	electron capture (EC); α decay
Discovery	1967
Mass excess	66,310 ±165 keV
Binding energy	7,485 ±1 keV
Single-particle energy	2,452 ±165 keV
Neutron separation energy	7,782 ±245 keV
Q value for electron capture	2,929 ±165 keV
β⁻ decay energy	-3,877 ±256 keV
β⁻ decay energy with neutron	-10,720 ±260 keV

Point at nuclide Decay chain of Einsteinium-245

246EsEinsteinium-246

Classification	z: 99; n: 147; m: 246
Half life	7.5 ±5 m
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1954
Mass excess	67,810 ±89.92 keV
Binding energy	7,480 ±0.3655 keV
Single-particle energy	2,855 ±89.95 keV
Neutron separation energy	6,567 ±188 keV
Q value for electron capture	3,728 ±89.93 keV
β⁻ decay energy	-2,373 ±90.95 keV
β⁻ decay energy with neutron	-10,450 ±215 keV

Point at nuclide Decay chain of Einsteinium-246

247EsEinsteinium-247

Classification	z: 99; n: 148; m: 247
Half life	stable nuclide
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Discovery	1967
Mass excess	68,570 ±19.44 keV
Binding energy	7,480 ±0.0787 keV
Single-particle energy	2,800 ±19.49 keV
Neutron separation energy	7,311 ±92 keV
Q value for electron capture	2,469 ±24.15 keV
β⁻ decay energy	-3,094 ±182 keV
β⁻ decay energy with neutron	-9,685 ±23.76 keV

Point at nuclide

248EsEinsteinium-248

Classification	z: 99; n: 149; m: 248
Half life	24 ±3 m
Natural abundance	synthetic nuclide
Spin/parity	(2- 0+)
Decay modes	electron capture (EC); α decay
Discovery	1956
Mass excess	70,290 ±52 keV
Binding energy	7,476 keV
Single-particle energy	3,099 ±54 keV
Neutron separation energy	6,351 ±56 keV
Q value for electron capture	3,061 ±52.25 keV
β⁻ decay energy	-1,599 ±53 keV
β⁻ decay energy with neutron	-9,445 ±188 keV

Point at nuclide Decay chain of Einsteinium-248

249EsEinsteinium-249

Classification	z: 99; n: 150; m: 249
Half life	102.2 ±6 m
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1956
Mass excess	71,170 ±30 keV
Binding energy	7,474 keV
Single-particle energy	3,352 ±31 keV
Neutron separation energy	7,196 ±60 keV
Q value for electron capture	1,452 ±30.02 keV
β⁻ decay energy	-2,344 ±31 keV
β⁻ decay energy with neutron	-8,794 ±31 keV

Point at nuclide Decay chain of Einsteinium-249

250EsEinsteinium-250

Classification	z: 99; n: 151; m: 250
Half life	8.6 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	(6+)
Decay modes	electron capture (EC); α decay
Discovery	1956
Mass excess	73,220 ±100 keV
Binding energy	7,469 keV
Single-particle energy	3,786 ±100 keV
Neutron separation energy	6,021 ±104 keV
Q value for electron capture	2,054 ±100 keV
β⁻ decay energy	-847 ±100 keV
β⁻ decay energy with neutron	-8,365 ±100 keV

Point at nuclide Decay chain of Einsteinium-250

251EsEinsteinium-251

Classification	z: 99; n: 152; m: 251
Half life	33 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	electron capture (EC); α decay
Discovery	1956
Mass excess	74,510 ±5.288 keV
Binding energy	7,465 ±0.0211 keV
Single-particle energy	3,947 ±5.361 keV
Neutron separation energy	6,785 ±100 keV
Q value for electron capture	376.5 ±6.571 keV
β⁻ decay energy	-1,448 ±15.23 keV
β⁻ decay energy with neutron	-7,632 ±9.425 keV

Point at nuclide Decay chain of Einsteinium-251

252EsEinsteinium-252

Classification	z: 99; n: 153; m: 252
Half life	471.7 ±19 d
Natural abundance	synthetic nuclide
Spin/parity	(5-)
Decay modes	α decay; electron capture (EC)
Discovery	1956
Mass excess	77,290 ±50.05 keV
Binding energy	7,457 ±0.1986 keV
Single-particle energy	4,129 ±50.16 keV
Neutron separation energy	5,288 ±50.32 keV
Q value for electron capture	1,260 ±50.1 keV
β⁻ decay energy	477.9 ±50.32 keV
β⁻ decay energy with neutron	-6,736 ±52.05 keV

Point at nuclide Decay chain of Einsteinium-252

253EsEinsteinium-253

Classification	z: 99; n: 154; m: 253
Half life	20.47 ±3 d
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	79,010 ±1.249 keV
Binding energy	7,452 ±0.0049 keV
Single-particle energy	4,313 ±2.582 keV
Neutron separation energy	6,355 ±50.06 keV
Q value for electron capture	-291.1 ±4.436 keV
β⁻ decay energy	-335.1 ±1.078 keV
β⁻ decay energy with neutron	-5,878 ±5.162 keV
Magnetic dipole moment	4.1 ±0.07 μN
Electric quadrupole moment	6.7 ±0.8 b

Point at nuclide Decay chain of Einsteinium-253

254EsEinsteinium-254

Classification	z: 99; n: 155; m: 254
Half life	275.7 ±5 d
Natural abundance	synthetic nuclide
Spin/parity	(7+)
Decay modes	α decay; β⁻ decay; spontaneous fission
Discovery	1954
Mass excess	81,990 ±2.936 keV
Binding energy	7,443 ±0.0116 keV
Single-particle energy	4,596 ±5.101 keV
Neutron separation energy	5,087 ±2.854 keV
Q value for electron capture	652.7 ±11.83 keV
β⁻ decay energy	1,091 ±2.285 keV
β⁻ decay energy with neutron	-5,423 ±2.998 keV
Magnetic dipole moment	4.4 ±0.4 μN

Point at nuclide Decay chain of Einsteinium-254

255EsEinsteinium-255

Classification	z: 99; n: 156; m: 255
Half life	39.8 ±12 d
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	β⁻ decay; α decay; spontaneous fission
Discovery	1954
Mass excess	84,080 ±10.81 keV
Binding energy	7,437 ±0.0424 keV
Single-particle energy	4,541 ±15.62 keV
Neutron separation energy	5,976 ±11.09 keV
Q value for electron capture	-719.8 ±200.2 keV
β⁻ decay energy	288.7 ±10.1 keV
β⁻ decay energy with neutron	-4,885 ±10.85 keV

Point at nuclide Decay chain of Einsteinium-255

256EsEinsteinium-256

Classification	z: 99; n: 157; m: 256
Half life	25.4 ±24 m
Natural abundance	synthetic nuclide
Spin/parity	(1+ 0-)
Decay modes	β⁻ decay
Discovery	1976
Mass excess	87,180 ±100 keV
Binding energy	7,428 keV
Single-particle energy	4,913 ±224 keV
Neutron separation energy	4,976 ±101 keV
Q value for electron capture	144 ±329.5 keV
β⁻ decay energy	1,700 ±100 keV
β⁻ decay energy with neutron	-4,687 ±100 keV

Point at nuclide Decay chain of Einsteinium-256

257EsEinsteinium-257

Classification	z: 99; n: 158; m: 257
Half life	7.7 ±2 d
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; spontaneous fission
Discovery	1987
Mass excess	89,400 ±411 keV
Binding energy	7,422 ±2 keV
Single-particle energy	4,926 ±517 keV
Neutron separation energy	5,853 ±423 keV
β⁻ decay energy	813 ±411 keV
β⁻ decay energy with neutron	-4,153 ±411 keV

Point at nuclide Decay chain of Einsteinium-257