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Californium-251: Wikis

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Actinides Half-life Fission products
244Cm 241Pu f 250Cf 243Cmf 10–30 y 137Cs 90Sr 85Kr
232 f 238Pu f is for
fissile
69–90 y 151Sm nc➔
4n 249Cf  f 242Amf 141–351 No fission product
has half-life 102
to 2×105 years
241Am 251Cf  f 431–898
240Pu 229Th 246Cm 243Am 5–7 ky
4n 245Cmf 250Cm 239Pu f 8–24 ky
233U    f 230Th 231Pa 32–160
4n+1 234U 4n+3 211–290 99Tc 126Sn 79Se
248Cm 242Pu 340–373 Long-lived fission products
237Np 4n+2 1–2 my 93Zr 135Cs nc➔
236U 4n+1 247Cmf 6–23 107Pd 129I
244Pu 80 my >7% >5% >1% >.1%
232Th 238U 235U    f 0.7–12by fission product yield

Californium (Cf) has no stable isotopes. A standard atomic mass cannot be given.

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
237Cf 98 139 237.06207(54)# 2.1(3) s 5/2+#
238Cf 98 140 238.06141(43)# 21.1(13) ms 0+
239Cf 98 141 239.06242(23)# 60(30) s [39(+37-12) s] 5/2+#
240Cf 98 142 240.06230(22)# 1.06(15) min 0+
241Cf 98 143 241.06373(27)# 3.78(70) min 7/2-#
242Cf 98 144 242.06370(4) 3.49(15) min 0+
243Cf 98 145 243.06543(15)# 10.7(5) min (1/2+)
244Cf 98 146 244.066001(3) 19.4(6) min 0+
245Cf 98 147 245.068049(3) 45.0(15) min (5/2+)
246Cf 98 148 246.0688053(22) 35.7(5) h 0+
247Cf 98 149 247.071001(9) 3.11(3) h (7/2+)#
248Cf 98 150 248.072185(6) 333.5(28) d 0+
249Cf 98 151 249.0748535(24) 351(2) a 9/2-
249mCf 144.98(5) keV 45(5) µs 5/2+
250Cf 98 152 250.0764061(22) 13.08(9) a 0+
251Cf 98 153 251.079587(5) 900(40) a 1/2+
252Cf 98 154 252.081626(5) 2.645(8) a 0+
253Cf 98 155 253.085133(7) 17.81(8) d (7/2+)
254Cf 98 156 254.087323(13) 60.5(2) d 0+
255Cf 98 157 255.09105(22)# 85(18) min (7/2+)
256Cf 98 158 256.09344(32)# 12.3(12) min 0+
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Notes

  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC which use expanded uncertainties.

References

Isotopes of berkelium Isotopes of californium Isotopes of einsteinium
Index to isotope pages · Table of nuclides

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