HomeTable of NuclidesCaliforniumIsotopes

Isotopes of Californium

List of known isotopes of the element Californium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
²³⁶Cf	stab.	syn.	—	—	—	—
²³⁷Cf	2.1 ±3 s	syn.	—	—	2.37·10⁸ ±104.5 keV/c²	1995
²³⁸Cf	21.1 ±13 ms	syn.	0+	—	2.38·10⁸ ±320 keV/c²	1995
²³⁹Cf	39 ± s	syn.	—	—	2.39·10⁸ ±129 keV/c²	1981
²⁴⁰Cf	0.96 ±15 m	syn.	0+	—	2.4·10⁸ ±19.36 keV/c²	1970
²⁴¹Cf	3.78 ±70 m	syn.	(7/2-)	—	2.41·10⁸ ±180 keV/c²	1970
²⁴²Cf	3.5 ±2 m	syn.	0+	—	2.42·10⁸ ±13.84 keV/c²	1967
²⁴³Cf	10.7 ±5 m	syn.	(1/2+)	—	2.43·10⁸ ±194 keV/c²	1967
²⁴⁴Cf	19.4 ±6 m	syn.	0+	—	2.44·10⁸ ±2.809 keV/c²	1956
²⁴⁵Cf	45 ±15 m	syn.	1/2+	—	2.45·10⁸ ±2.606 keV/c²	1956
²⁴⁶Cf	35.7 ±5 h	syn.	0+	—	2.46·10⁸ ±1.625 keV/c²	1951
²⁴⁷Cf	3.11 ±3 h	syn.	(7/2+)	—	2.47·10⁸ ±15.38 keV/c²	1954
²⁴⁸Cf	333.5 ±28 d	syn.	0+	—	2.48·10⁸ ±5.497 keV/c²	1954
²⁴⁹Cf	351 ±2 a	syn.	9/2-	—	2.49·10⁸ ±1.269 keV/c²	1954
²⁵⁰Cf	13.08 ±9 a	syn.	0+	—	2.5·10⁸ ±1.65 keV/c²	1954
²⁵¹Cf	898 ±44 a	syn.	1/2+	—	2.51·10⁸ ±4.187 keV/c²	1954
²⁵²Cf	2.647 ±3 a	syn.	0+	—	2.52·10⁸ ±2.531 keV/c²	1954
²⁵³Cf	17.81 ±8 d	syn.	(7/2+)	—	2.53·10⁸ ±4.57 keV/c²	1954
²⁵⁴Cf	60.5 ±2 d	syn.	0+	—	2.54·10⁸ ±12.3 keV/c²	1955
²⁵⁵Cf	85 ±18 m	syn.	(7/2+)	—	2.55·10⁸ ±215 keV/c²	1981
²⁵⁶Cf	12.3 ±12 m	syn.	0+	—	2.56·10⁸ ±338 keV/c²	1980

236CfCalifornium-236

Classification	z: 98; n: 138; m: 236
Half life	stable nuclide
Natural abundance	synthetic nuclide

Point at nuclide

237CfCalifornium-237

Classification	z: 98; n: 139; m: 237
Half life	2.1 ±3 s
Natural abundance	synthetic nuclide
Decay modes	α decay; spontaneous fission
Discovery	1995
Mass excess	57,930 ±97.34 keV
Binding energy	7,503 ±0.4107 keV
Single-particle energy	2,892 ±373 keV

Point at nuclide Decay chain of Californium-237

238CfCalifornium-238

Classification	z: 98; n: 140; m: 238
Half life	21.1 ±13 ms
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	spontaneous fission; α decay
Discovery	1995
Mass excess	57,270 ±298 keV
Binding energy	7,509 ±1 keV
Single-particle energy	3,221 ±377 keV
Neutron separation energy	8,732 ±314 keV
Q value for electron capture	3,062 ±392.8 keV

Point at nuclide Decay chain of Californium-238

239CfCalifornium-239

Classification	z: 98; n: 141; m: 239
Half life	39 ± s
Natural abundance	synthetic nuclide
Decay modes	electron capture (EC); α decay
Discovery	1981
Mass excess	58,200 ±120 keV
Binding energy	7,507 ±1 keV
Single-particle energy	3,304 ±283 keV
Neutron separation energy	7,147 ±321 keV
Q value for electron capture	3,952 ±239.2 keV
β⁻ decay energy	-5,429 ±323 keV

Point at nuclide Decay chain of Californium-239

240CfCalifornium-240

Classification	z: 98; n: 142; m: 240
Half life	0.96 ±15 m
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; spontaneous fission; electron capture + β⁺ decay
Discovery	1970
Mass excess	57,980 ±18.03 keV
Binding energy	7,510 ±0.0751 keV
Single-particle energy	3,550 ±208 keV
Neutron separation energy	8,284 ±121 keV
Q value for electron capture	2,324 ±151 keV
β⁻ decay energy	-6,237 ±366 keV
β⁻ decay energy with neutron	-13,720 ±300 keV

Point at nuclide Decay chain of Californium-240

241CfCalifornium-241

Classification	z: 98; n: 143; m: 241
Half life	3.78 ±70 m
Natural abundance	synthetic nuclide
Spin/parity	(7/2-)
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1970
Mass excess	59,320 ±167 keV
Binding energy	7,507 ±1 keV
Single-particle energy	3,626 ±225 keV
Neutron separation energy	6,733 ±168 keV
Q value for electron capture	3,346 ±234.7 keV
β⁻ decay energy	-4,567 ±285 keV
β⁻ decay energy with neutron	-12,970 ±402 keV

Point at nuclide Decay chain of Californium-241

242CfCalifornium-242

Classification	z: 98; n: 144; m: 242
Half life	3.5 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; electron capture + β⁺ decay; spontaneous fission
Discovery	1967
Mass excess	59,380 ±12.89 keV
Binding energy	7,509 ±0.0533 keV
Single-particle energy	3,883 ±166 keV
Neutron separation energy	8,011 ±168 keV
Q value for electron capture	1,634 ±135.6 keV
β⁻ decay energy	-5,414 ±257 keV
β⁻ decay energy with neutron	-12,580 ±231 keV

Point at nuclide Decay chain of Californium-242

243CfCalifornium-243

Classification	z: 98; n: 145; m: 243
Half life	10.7 ±5 m
Natural abundance	synthetic nuclide
Spin/parity	(1/2+)
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1967
Mass excess	60,990 ±181 keV
Binding energy	7,505 ±1 keV
Single-particle energy	4,051 ±225 keV
Neutron separation energy	6,468 ±181 keV
Q value for electron capture	2,300 ±181 keV
β⁻ decay energy	-3,757 ±275 keV
β⁻ decay energy with neutron	-11,890 ±314 keV

Point at nuclide Decay chain of Californium-243

244CfCalifornium-244

Classification	z: 98; n: 146; m: 244
Half life	19.4 ±6 m
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay
Discovery	1956
Mass excess	61,470 ±2.617 keV
Binding energy	7,505 ±0.0107 keV
Single-particle energy	4,500 ±5.024 keV
Neutron separation energy	7,583 ±181 keV
Q value for electron capture	764.2 ±14.63 keV
β⁻ decay energy	-4,547 ±181 keV
β⁻ decay energy with neutron	-11,340 ±207 keV

Point at nuclide Decay chain of Californium-244

245CfCalifornium-245

Classification	z: 98; n: 147; m: 245
Half life	45 ±15 m
Natural abundance	synthetic nuclide
Spin/parity	1/2+
Decay modes	electron capture (EC); α decay
Discovery	1956
Mass excess	63,380 ±2.428 keV
Binding energy	7,499 ±0.0099 keV
Single-particle energy	4,617 ±14.51 keV
Neutron separation energy	6,164 ±3.308 keV
Q value for electron capture	1,571 ±3.018 keV
β⁻ decay energy	-2,930 ±165 keV
β⁻ decay energy with neutron	-10,720 ±181 keV

Point at nuclide Decay chain of Californium-245

246CfCalifornium-246

Classification	z: 98; n: 148; m: 246
Half life	35.7 ±5 h
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; electron capture (EC); spontaneous fission
Discovery	1951
Mass excess	64,090 ±1.514 keV
Binding energy	7,499 ±0.0062 keV
Single-particle energy	5,012 ±1.769 keV
Neutron separation energy	7,366 ±2.422 keV
Q value for electron capture	123.3 ±60.03 keV
β⁻ decay energy	-3,729 ±89.93 keV
β⁻ decay energy with neutron	-10,300 ±165 keV

Point at nuclide Decay chain of Californium-246

247CfCalifornium-247

Classification	z: 98; n: 149; m: 247
Half life	3.11 ±3 h
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	electron capture (EC); α decay
Discovery	1954
Mass excess	66,100 ±14.32 keV
Binding energy	7,493 ±0.058 keV
Single-particle energy	5,146 ±61.7 keV
Neutron separation energy	6,052 ±14.4 keV
Q value for electron capture	619.8 ±15.23 keV
β⁻ decay energy	-2,470 ±24.14 keV
β⁻ decay energy with neutron	-9,781 ±91.05 keV

Point at nuclide Decay chain of Californium-247

248CfCalifornium-248

Classification	z: 98; n: 150; m: 248
Half life	333.5 ±28 d
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	67,230 ±5.121 keV
Binding energy	7,491 ±0.0207 keV
Single-particle energy	5,540 ±7.175 keV
Neutron separation energy	6,942 ±15.21 keV
Q value for electron capture	-893.2 ±50.31 keV
β⁻ decay energy	-3,061 ±53 keV
β⁻ decay energy with neutron	-9,412 ±20.1 keV

Point at nuclide Decay chain of Californium-248

249CfCalifornium-249

Classification	z: 98; n: 151; m: 249
Half life	351 ±2 a
Natural abundance	synthetic nuclide
Spin/parity	9/2-
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	69,720 ±1.182 keV
Binding energy	7,483 ±0.0048 keV
Single-particle energy	5,697 ±50.06 keV
Neutron separation energy	5,586 ±5.045 keV
Q value for electron capture	-123.6 ±1.7 keV
β⁻ decay energy	-1,452 ±30 keV
β⁻ decay energy with neutron	-8,648 ±52 keV

Point at nuclide Decay chain of Californium-249

250CfCalifornium-250

Classification	z: 98; n: 152; m: 250
Half life	13.08 ±9 a
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	71,170 ±1.538 keV
Binding energy	7,479 ±0.0062 keV
Single-particle energy	5,964 ±1.375 keV
Neutron separation energy	6,623 ±1.315 keV
Q value for electron capture	-1,782 ±3.28 keV
β⁻ decay energy	-2,055 ±100 keV
β⁻ decay energy with neutron	-8,076 ±30 keV

Point at nuclide Decay chain of Californium-250

251CfCalifornium-251

Classification	z: 98; n: 153; m: 251
Half life	898 ±44 a
Natural abundance	synthetic nuclide
Spin/parity	1/2+
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	74,130 ±3.901 keV
Binding energy	7,470 ±0.0155 keV
Single-particle energy	6,105 ±4.596 keV
Neutron separation energy	5,106 ±3.884 keV
Q value for electron capture	-1,093 ±11.4 keV
β⁻ decay energy	-376.6 ±6.467 keV
β⁻ decay energy with neutron	-7,162 ±100 keV

Point at nuclide Decay chain of Californium-251

252CfCalifornium-252

Classification	z: 98; n: 154; m: 252
Half life	2.647 ±3 a
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	α decay; spontaneous fission
Discovery	1954
Mass excess	76,030 ±2.358 keV
Binding energy	7,465 ±0.0094 keV
Single-particle energy	6,482 ±10.79 keV
Neutron separation energy	6,171 ±4.069 keV
Q value for electron capture	-2,501 ±200 keV
β⁻ decay energy	-1,260 ±50 keV
β⁻ decay energy with neutron	-6,549 ±5.752 keV

Point at nuclide Decay chain of Californium-252

253CfCalifornium-253

Classification	z: 98; n: 155; m: 253
Half life	17.81 ±8 d
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	β⁻ decay; α decay
Discovery	1954
Mass excess	79,300 ±4.257 keV
Binding energy	7,454 ±0.0168 keV
Single-particle energy	6,522 ±200 keV
Neutron separation energy	4,804 ±3.544 keV
Q value for electron capture	-1,628 ±359 keV
β⁻ decay energy	291 ±4.385 keV
β⁻ decay energy with neutron	-6,065 ±50.12 keV

Point at nuclide Decay chain of Californium-253

254CfCalifornium-254

Classification	z: 98; n: 156; m: 254
Half life	60.5 ±2 d
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	spontaneous fission; α decay
Discovery	1955
Mass excess	81,340 ±11.46 keV
Binding energy	7,449 ±0.0451 keV
Single-particle energy	6,876 ±359 keV
Neutron separation energy	6,031 ±11.76 keV
Q value for electron capture	-3,052 ±298.2 keV
β⁻ decay energy	-652.8 ±11.8 keV
β⁻ decay energy with neutron	-5,741 ±11.5 keV

Point at nuclide Decay chain of Californium-254

255CfCalifornium-255

Classification	z: 98; n: 157; m: 255
Half life	85 ±18 m
Natural abundance	synthetic nuclide
Spin/parity	(7/2+)
Decay modes	β⁻ decay
Discovery	1981
Mass excess	84,800 ±200 keV
Binding energy	7,438 ±1 keV
Single-particle energy	6,873 ±359 keV
Neutron separation energy	4,603 ±201 keV
β⁻ decay energy	720 ±200 keV
β⁻ decay energy with neutron	-5,256 ±200 keV

Point at nuclide Decay chain of Californium-255

256CfCalifornium-256

Classification	z: 98; n: 158; m: 256
Half life	12.3 ±12 m
Natural abundance	synthetic nuclide
Spin/parity	0+
Decay modes	spontaneous fission; α decay
Discovery	1980
Mass excess	87,040 ±314 keV
Binding energy	7,432 ±1 keV
Neutron separation energy	5,840 ±373 keV
β⁻ decay energy	-144 ±330 keV
β⁻ decay energy with neutron	-5,120 ±315 keV

Point at nuclide Decay chain of Californium-256

Isotopes of Californium

236CfCalifornium-236ads_clickdownload

237CfCalifornium-237ads_clickcall_splitdownload

238CfCalifornium-238ads_clickcall_splitdownload

239CfCalifornium-239ads_clickcall_splitdownload

240CfCalifornium-240ads_clickcall_splitdownload

241CfCalifornium-241ads_clickcall_splitdownload

242CfCalifornium-242ads_clickcall_splitdownload

243CfCalifornium-243ads_clickcall_splitdownload

244CfCalifornium-244ads_clickcall_splitdownload

245CfCalifornium-245ads_clickcall_splitdownload

246CfCalifornium-246ads_clickcall_splitdownload

247CfCalifornium-247ads_clickcall_splitdownload

248CfCalifornium-248ads_clickcall_splitdownload

249CfCalifornium-249ads_clickcall_splitdownload

250CfCalifornium-250ads_clickcall_splitdownload

251CfCalifornium-251ads_clickcall_splitdownload

252CfCalifornium-252ads_clickcall_splitdownload

253CfCalifornium-253ads_clickcall_splitdownload

254CfCalifornium-254ads_clickcall_splitdownload

255CfCalifornium-255ads_clickcall_splitdownload

256CfCalifornium-256ads_clickcall_splitdownload

236CfCalifornium-236

237CfCalifornium-237

238CfCalifornium-238

239CfCalifornium-239

240CfCalifornium-240

241CfCalifornium-241

242CfCalifornium-242

243CfCalifornium-243

244CfCalifornium-244

245CfCalifornium-245

246CfCalifornium-246

247CfCalifornium-247

248CfCalifornium-248

249CfCalifornium-249

250CfCalifornium-250

251CfCalifornium-251

252CfCalifornium-252

253CfCalifornium-253

254CfCalifornium-254

255CfCalifornium-255

256CfCalifornium-256