镄的同位素

**主要的镄同位素**
α	248Cf
α	249Cf
α	251Cf
SF	–
←Es（99）	Md（101）→
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镄的同位素

图表

符号	Z（p ）	N（n ）	同位素质量（u）	半衰期	衰变方式^[1]^{[n 1]}	衰变产物	原子核自旋
符号	激发能量			半衰期	衰变方式^[1]^{[n 1]}	衰变产物	原子核自旋
²⁴¹Fm	100	141	241.07421(32)#	730(60) µs	SF(>78%)	(various)	5/2#+
²⁴¹Fm	100	141	241.07421(32)#	730(60) µs	α (<14%)	²³⁷Cf	5/2#+
²⁴²Fm	100	142	242.07343(43)#	0.8(2) ms	SF	(various)	0+
²⁴²Fm	100	142	242.07343(43)#	0.8(2) ms	α （不常见）	²³⁸Cf	0+
²⁴³Fm	100	143	243.07447(23)#	231(9) ms	α (91%)	²³⁹Cf	7/2−#
					SF (9%)	(various)
					β⁺ （不常见）	²⁴³Es
²⁴⁴Fm	100	144	244.07404(22)#	3.12(8) ms	SF (99%)	(various)	0+
²⁴⁴Fm	100	144	244.07404(22)#	3.12(8) ms	α (1%)	²⁴⁰Cf	0+
²⁴⁵Fm	100	145	245.07535(21)#	4.2(13) s	α (95.7%)	²⁴¹Cf	1/2+#
					β⁺ (4.2%)	²⁴⁵Es
					SF (.13%)	(various)
²⁴⁶Fm	100	146	246.075350(17)	1.54(4) s	α (85%)	²⁴²Cf	0+
					β⁺ (10%)	²⁴⁶Es
					β⁺, SF (10%)	(various)
					SF (4.5%)	(various)
²⁴⁷Fm	100	147	247.07695(12)#	31(1) s	α (>50%)	²⁴³Cf	(7/2+)
²⁴⁷Fm	100	147	247.07695(12)#	31(1) s	β⁺ (<50%)	²⁴⁷Es	(7/2+)
²⁴⁸Fm	100	148	248.077186(9)	35.1(8) s	α (93%)	²⁴⁴Cf	0+
					β⁺ (7%)	²⁴⁸Es
					SF (.10%)	(various)
²⁴⁹Fm	100	149	249.078928(7)	1.6(1) min	β⁺ (85%)	²⁴⁹Es	(7/2+)#
²⁴⁹Fm	100	149	249.078928(7)	1.6(1) min	α (15%)	²⁴⁵Cf	(7/2+)#
²⁵⁰Fm	100	150	250.079521(9)	30.4(15) min	α (90%)	²⁴⁶Cf	0+
					ε (10%)	²⁵⁰Es
					SF (6.9×10⁻³%)	(various)
^250mFm	1199.2(10) keV			1.92(5) s	IT	²⁵⁰Fm	(8−)
²⁵¹Fm	100	151	251.081540(16)	5.30(8) h	β⁺ (98.2%)	²⁵¹Es	(9/2−)
²⁵¹Fm	100	151	251.081540(16)	5.30(8) h	α (1.8%)	²⁴⁷Cf	(9/2−)
^251mFm	200.09(11) keV			21.1(16) µs			(5/2+)
²⁵²Fm	100	152	252.082467(6)	25.39(4) h	α (99.99%)	²⁴⁸Cf	0+
					SF (.0023%)	(various)
					β⁺β⁺ （不常见）	²⁵²Cf
²⁵³Fm	100	153	253.085185(4)	3.00(12) d	ε (88%)	²⁵³Es	(1/2)+
²⁵³Fm	100	153	253.085185(4)	3.00(12) d	α (12%)	²⁴⁹Cf	(1/2)+
²⁵⁴Fm	100	154	254.0868544(30)	3.240(2) h	α (99.94%)	²⁵⁰Cf	0+
²⁵⁴Fm	100	154	254.0868544(30)	3.240(2) h	SF (.0592%)	(various)	0+
²⁵⁵Fm	100	155	255.089964(5)	20.07(7) h	α	²⁵¹Cf	7/2+
²⁵⁵Fm	100	155	255.089964(5)	20.07(7) h	SF (2.4×10⁻⁵%)	(various)	7/2+
²⁵⁶Fm	100	156	256.091774(8)	157.6(13) min	SF (91.9%)	(various)	0+
²⁵⁶Fm	100	156	256.091774(8)	157.6(13) min	α (8.1%)	²⁵²Cf	0+
²⁵⁷Fm^{[n 2]}	100	157	257.095106(7)	100.5(2) d	α (99.79%)	²⁵³Cf	(9/2+)
²⁵⁷Fm^{[n 2]}	100	157	257.095106(7)	100.5(2) d	SF (.21%)	(various)	(9/2+)
²⁵⁸Fm	100	158	258.09708(22)#	370(14) µs	SF	(various)	0+
²⁵⁹Fm	100	159	259.1006(3)#	1.5(3) s	SF	(various)	3/2+#
²⁶⁰Fm^{[n 3]}^{[n 4]}	100	160	260.10281(55)#	4 ms			0+

备注：画上#号的数据代表没有经过实验的证明，只是理论推测而已，而用括号括起来的代表数据不确定性。

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注释

↑ Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission
↑ Heaviest nuclide produced via neutron capture
↑ Discovery of this isotope is unconfirmed
↑ Not directly synthesized, occurs as decay product of ²⁶⁰Md

参考文献

↑ Universal Nuclide Chart. nucleonica.

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683–800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3–128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

[2] Abbreviations:
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission

[3] Heaviest nuclide produced via neutron capture

[uc-4] Discovery of this isotope is unconfirmed

[5] Not directly synthesized, occurs as decay product of ²⁶⁰Md

[1] Universal Nuclide Chart. nucleonica.

[1]

[n 1]

[n 2]

[n 3]

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