Isotopes of californium
List of isotopes
Abbreviations: EC: Electron capture SF: Spontaneous fission Lightest nuclide known to undergo spontaneous fission as the main decay mode High neutron cross-section, tends to absorb neutrons Most common isotope High neutron emitter, average 3.7 neutrons per fission

Isotopes of californium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture SF: Spontaneous fission Lightest nuclide known to undergo spontaneous fission as the main decay mode High neutron cross-section, tends to absorb neutrons Most common isotope High neutron emitter, average 3.7 neutrons per fission

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin and parity

excitation energy

237Cf	98	139	237.06207(54)#	2.1(3) s	SF	(various)	5/2+#

β+	237Bk

α	233Cm

238Cf	98	140	238.06141(43)#	21.1(13) ms	SF	(various)	0+

β+ (rare)	238Bk

α (rare)	234Cm

239Cf	98	141	239.06242(23)#	60(30) s [39(+37−12) s]	α	235Cm	5/2+#

β+ (rare)	239Bk

240Cf	98	142	240.06230(22)#	1.06(15) min	α (98%)	236Cm	0+

SF (2%)	(various)

β+ (rare)	240Bk

241Cf	98	143	241.06373(27)#	3.78(70) min	β+ (75%)	241Bk	7/2−#

α (25%)	237Cm

242Cf	98	144	242.06370(4)	3.49(15) min	α (80%)	238Cm	0+

β+ (20%)	242Bk

SF (.014%)	(various)

243Cf	98	145	243.06543(15)#	10.7(5) min	β+ (86%)	243Bk	(1/2+)

α (14%)	239Cm

244Cf	98	146	244.066001(3)	19.4(6) min	α (99%)	240Cm	0+

EC (1%)	244Bk

245Cf	98	147	245.068049(3)	45.0(15) min	β+ (64%)	245Bk	(5/2+)

α (36%)	241Cm

246Cf	98	148	246.0688053(22)	35.7(5) h	α	242Cm	0+

EC (5×10−4%)	246Bk

SF (2×10−4%)	(various)

247Cf	98	149	247.071001(9)	3.11(3) h	EC (99.96%)	247Bk	(7/2+)#

α (.04%)	243Cm

248Cf	98	150	248.072185(6)	333.5(28) d	α (99.99%)	244Cm	0+

SF (.0029%)	(various)

249Cf	98	151	249.0748535(24)	351(2) y	α	245Cm	9/2−

SF (5×10−7%)	(various)

249mCf	144.98(5) keV	45(5) µs	5/2+

250Cf	98	152	250.0764061(22)	13.08(9) y	α (99.92%)	246Cm	0+

SF (.077%)	(various)

251Cf	98	153	251.079587(5)	900(40) y	α	247Cm	1/2+

252Cf	98	154	252.081626(5)	2.645(8) y	α (96.9%)	248Cm	0+

SF (3.09%)	(various)

253Cf	98	155	253.085133(7)	17.81(8) d	β− (99.69%)	253Es	(7/2+)

α (.31%)	249Cm

254Cf	98	156	254.087323(13)	60.5(2) d	SF (99.69%)	(various)	0+

α (.31%)	250Cm

β−β− (rare)	254Fm

255Cf	98	157	255.09105(22)#	85(18) min	β− (99.99%)	255Es	(7/2+)

SF (.001%)	(various)

α (10−5%)	251Cm

256Cf	98	158	256.09344(32)#	12.3(12) min	SF (~100%)	(various)	0+

α (10−6%)	252Cm

β−β− (rare)	256Fm

Sentence(s)

Californium-252 (Cf-252) undergoes spontaneous fission.

final_sentence: Californium-252 (Cf-252) undergoes spontaneous fission.