HomeTable of NuclidesBerkeliumIsotopes

Isotopes of Berkelium

List of known isotopes of the element Berkelium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
²³³Bk	21 ± s	syn.	—	—	2.33·10⁸ ±250 keV/c²	2015
²³⁴Bk	140 ± s	syn.	—	—	2.34·10⁸ ±164 keV/c²	2003
²³⁶Bk	22 ± s	syn.	(4+ 6-)	—	2.36·10⁸ ±387 keV/c²	2017
²³⁸Bk	144 ±5 s	syn.	—	—	2.38·10⁸ ±275 keV/c²	1994
²³⁹Bk	stab.	syn.	(3/2- 7/2+)	—	2.39·10⁸ ±222 keV/c²	1989
²⁴⁰Bk	4.8 ±8 m	syn.	—	—	2.4·10⁸ ±161 keV/c²	1980
²⁴¹Bk	4.6 ±4 m	syn.	(7/2+)	—	2.41·10⁸ ±178 keV/c²	2003
²⁴²Bk	7 ±13 m	syn.	—	—	2.42·10⁸ ±144 keV/c²	1972
²⁴³Bk	4.6 ±2 h	syn.	(3/2-)	—	2.43·10⁸ ±4.856 keV/c²	1950
²⁴⁴Bk	5.02 ±3 h	syn.	(4-)	—	2.44·10⁸ ±15.45 keV/c²	1972
²⁴⁵Bk	4.95 ±3 d	syn.	3/2-	—	2.45·10⁸ ±1.923 keV/c²	1951
²⁴⁶Bk	1.8 ±2 d	syn.	2(-)	—	2.46·10⁸ ±64.43 keV/c²	1954
²⁴⁷Bk	1,380 ±250 a	syn.	3/2-	—	2.47·10⁸ ±5.57 keV/c²	1965
²⁴⁸Bk	9 a	syn.	(6+ 8-)	—	2.48·10⁸ ±53.73 keV/c²	1956
²⁴⁹Bk	330 ±4 d	syn.	7/2+	—	2.49·10⁸ ±1.339 keV/c²	1954
²⁵⁰Bk	3.212 ±5 h	syn.	2-	—	2.5·10⁸ ±3.11 keV/c²	1954
²⁵¹Bk	55.6 ±11 m	syn.	(3/2-)	—	2.51·10⁸ ±11.52 keV/c²	1967
²⁵³Bk	10 m	syn.	—	—	2.53·10⁸ ±385 keV/c²	1991

233BkBerkelium-233

Classification	z: 97; n: 136; m: 233
Half life	21 ± s
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; α decay
Discovery	2015
Mass excess	52,770 ±233 keV
Binding energy	7,519 ±1 keV
Single-particle energy	850 ±308 keV
Q value for electron capture	5,477 ±246.7 keV

Point at nuclide Decay chain of Berkelium-233

234BkBerkelium-234

Classification	z: 97; n: 137; m: 234
Half life	140 ± s
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture (EC)
Discovery	2003
Mass excess	53,390 ±153 keV
Binding energy	7,519 ±1 keV
Single-particle energy	1,187 ±173 keV
Neutron separation energy	7,447 ±278 keV
Q value for electron capture	6,672 ±153.9 keV

Point at nuclide Decay chain of Berkelium-234

236BkBerkelium-236

Classification	z: 97; n: 139; m: 236
Half life	22 ± s
Natural abundance	synthetic nuclide
Spin/parity	(4+ 6-)
Decay modes	electron capture + β⁺ decay; α decay; spontaneous fission + electron capture + β⁺ decay
Discovery	2017
Mass excess	53,540 ±361 keV
Binding energy	7,523 ±2 keV
Single-particle energy	1,761 ±375 keV
Neutron separation energy	7,300 ±539 keV
Q value for electron capture	5,689 ±361.4 keV

Point at nuclide Decay chain of Berkelium-236

238BkBerkelium-238

Classification	z: 97; n: 141; m: 238
Half life	144 ±5 s
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; spontaneous fission + electron capture + β⁺ decay
Discovery	1994
Mass excess	54,210 ±256 keV
Binding energy	7,525 ±1 keV
Single-particle energy	2,320 ±267 keV
Neutron separation energy	7,065 ±344 keV
Q value for electron capture	4,770 ±256.2 keV
β⁻ decay energy	-3,061 ±393 keV
β⁻ decay energy with neutron	-11,800 ±274 keV

Point at nuclide Decay chain of Berkelium-238

239BkBerkelium-239

Classification	z: 97; n: 142; m: 239
Half life	stable nuclide
Natural abundance	synthetic nuclide
Spin/parity	(3/2- 7/2+)
Discovery	1989
Mass excess	54,250 ±207 keV
Binding energy	7,527 ±1 keV
Single-particle energy	2,485 ±207 keV
Neutron separation energy	8,038 ±329 keV
Q value for electron capture	3,103 ±255.6 keV
β⁻ decay energy	-3,952 ±239 keV
β⁻ decay energy with neutron	-11,100 ±363 keV

Point at nuclide

240BkBerkelium-240

Classification	z: 97; n: 143; m: 240
Half life	4.8 ±8 m
Natural abundance	synthetic nuclide
Decay modes	electron capture + spontaneous fission; electron capture + β⁺ decay
Discovery	1980
Mass excess	55,660 ±150 keV
Binding energy	7,523 ±1 keV
Single-particle energy	2,772 ±212 keV
Neutron separation energy	6,657 ±256 keV
Q value for electron capture	3,939 ±150 keV
β⁻ decay energy	-2,324 ±151 keV
β⁻ decay energy with neutron	-10,610 ±192 keV

Point at nuclide Decay chain of Berkelium-240

241BkBerkelium-241

Classification	z: 97; n: 144; m: 241
Half life	4.6 ±4 m
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	α decay; electron capture + β⁺ decay
Discovery	2003
Mass excess	55,980 ±165 keV
Binding energy	7,524 ±1 keV
Single-particle energy	3,033 ±165 keV
Neutron separation energy	7,755 ±223 keV
Q value for electron capture	2,279 ±165 keV
β⁻ decay energy	-3,346 ±235 keV
β⁻ decay energy with neutron	-10,080 ±166 keV

Point at nuclide Decay chain of Berkelium-241

242BkBerkelium-242

Classification	z: 97; n: 145; m: 242
Half life	7 ±13 m
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1972
Mass excess	57,750 ±135 keV
Binding energy	7,519 ±1 keV
Single-particle energy	3,239 ±135 keV
Neutron separation energy	6,300 ±213 keV
Q value for electron capture	2,948 ±135 keV
β⁻ decay energy	-1,635 ±135 keV
β⁻ decay energy with neutron	-9,646 ±215 keV

Point at nuclide Decay chain of Berkelium-242

243BkBerkelium-243

Classification	z: 97; n: 146; m: 243
Half life	4.6 ±2 h
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1950
Mass excess	58,680 ±4.524 keV
Binding energy	7,517 ±0.0186 keV
Single-particle energy	3,403 ±4.398 keV
Neutron separation energy	7,134 ±135 keV
Q value for electron capture	1,507 ±4.765 keV
β⁻ decay energy	-2,300 ±181 keV
β⁻ decay energy with neutron	-8,769 ±13.62 keV

Point at nuclide Decay chain of Berkelium-243

244BkBerkelium-244

Classification	z: 97; n: 147; m: 244
Half life	5.02 ±3 h
Natural abundance	synthetic nuclide
Spin/parity	(4-)
Decay modes	electron capture (EC); α decay
Discovery	1972
Mass excess	60,710 ±14.39 keV
Binding energy	7,511 ±0.059 keV
Single-particle energy	3,757 ±14.39 keV
Neutron separation energy	6,047 ±15.01 keV
Q value for electron capture	2,261 ±14.44 keV
β⁻ decay energy	-764.3 ±14.57 keV
β⁻ decay energy with neutron	-8,347 ±181 keV

Point at nuclide Decay chain of Berkelium-244

245BkBerkelium-245

Classification	z: 97; n: 148; m: 245
Half life	4.95 ±3 d
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	electron capture (EC); α decay
Discovery	1951
Mass excess	61,810 ±1.792 keV
Binding energy	7,509 ±0.0073 keV
Single-particle energy	3,927 ±1.414 keV
Neutron separation energy	6,971 ±14.42 keV
Q value for electron capture	809.2 ±2.129 keV
β⁻ decay energy	-1,572 ±2.586 keV
β⁻ decay energy with neutron	-7,736 ±2.87 keV

Point at nuclide Decay chain of Berkelium-245

246BkBerkelium-246

Classification	z: 97; n: 149; m: 246
Half life	1.8 ±2 d
Natural abundance	synthetic nuclide
Spin/parity	2(-)
Decay modes	electron capture + β⁺ decay
Discovery	1954
Mass excess	63,960 ±60.01 keV
Binding energy	7,502 ±0.244 keV
Single-particle energy	4,326 ±60.01 keV
Neutron separation energy	5,918 ±60.02 keV
Q value for electron capture	1,350 ±60 keV
β⁻ decay energy	-123.4 ±60.01 keV
β⁻ decay energy with neutron	-7,490 ±60.04 keV

Point at nuclide Decay chain of Berkelium-246

247BkBerkelium-247

Classification	z: 97; n: 150; m: 247
Half life	1,380 ±250 a
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	α decay
Discovery	1965
Mass excess	65,480 ±5.189 keV
Binding energy	7,498 ±0.021 keV
Single-particle energy	4,416 ±5.261 keV
Neutron separation energy	6,548 ±60.23 keV
Q value for electron capture	-43.59 ±6.43 keV
β⁻ decay energy	-619.9 ±15.23 keV
β⁻ decay energy with neutron	-6,673 ±5.248 keV

Point at nuclide Decay chain of Berkelium-247

248BkBerkelium-248

Classification	z: 97; n: 151; m: 248
Half life	9 a
Natural abundance	synthetic nuclide
Spin/parity	(6+ 8-)
Discovery	1956
Mass excess	68,130 ±50.05 keV
Binding energy	7,490 ±0.2018 keV
Single-particle energy	4,691 ±50.16 keV
Neutron separation energy	5,429 ±50.32 keV
Q value for electron capture	738.3 ±50.11 keV
β⁻ decay energy	893.1 ±50.31 keV
β⁻ decay energy with neutron	-6,050 ±52.06 keV

Point at nuclide

249BkBerkelium-249

Classification	z: 97; n: 152; m: 249
Half life	330 ±4 d
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	β⁻ decay; α decay; spontaneous fission
Discovery	1954
Mass excess	69,840 ±1.248 keV
Binding energy	7,486 ±0.005 keV
Single-particle energy	4,835 ±2.581 keV
Neutron separation energy	6,356 ±50.06 keV
Q value for electron capture	-904.4 ±2.679 keV
β⁻ decay energy	123.6 ±0.4 keV
β⁻ decay energy with neutron	-5,463 ±5.061 keV
Magnetic dipole moment	2 ±0.4 μN

Point at nuclide Decay chain of Berkelium-249

250BkBerkelium-250

Classification	z: 97; n: 153; m: 250
Half life	3.212 ±5 h
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	β⁻ decay
Discovery	1954
Mass excess	72,950 ±2.898 keV
Binding energy	7,475 ±0.0116 keV
Single-particle energy	5,087 ±3.647 keV
Neutron separation energy	4,965 ±2.814 keV
Q value for electron capture	-37.59 ±10.67 keV
β⁻ decay energy	1,781 ±2.456 keV
β⁻ decay energy with neutron	-4,843 ±2.786 keV

Point at nuclide Decay chain of Berkelium-250

251BkBerkelium-251

Classification	z: 97; n: 154; m: 251
Half life	55.6 ±11 m
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	β⁻ decay
Discovery	1967
Mass excess	75,220 ±10.73 keV
Binding energy	7,469 ±0.0428 keV
Single-particle energy	5,050 ±14.71 keV
Neutron separation energy	5,795 ±11 keV
Q value for electron capture	-1,420 ±25.1 keV
β⁻ decay energy	1,093 ±10 keV
β⁻ decay energy with neutron	-4,014 ±10.72 keV

Point at nuclide Decay chain of Berkelium-251

253BkBerkelium-253

Classification	z: 97; n: 156; m: 253
Half life	10 m
Natural abundance	synthetic nuclide
Discovery	1991
Mass excess	80,920 ±359 keV
Binding energy	7,451 ±1 keV
Single-particle energy	5,416 ±467 keV
Neutron separation energy	5,677 ±411 keV
β⁻ decay energy	1,627 ±359 keV
β⁻ decay energy with neutron	-3,177 ±359 keV

Point at nuclide