镅的同位素

**主要的镅同位素**
α	237Np
α	238Np
SF	–
α	239Np
←Pu（94）	Cm（96）→
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镅的同位素

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
²³¹Am	95	136	231.04556(32)#	30# s	β⁺	²³¹Pu
²³¹Am	95	136	231.04556(32)#	30# s	α （不常见）	²²⁷Np
²³²Am	95	137	232.04659(32)#	79(2) s	β⁺ (98%)	²³²Pu
					α (2%)	²²⁸Np
					β⁺, SF (.069%)	(various)
²³³Am	95	138	233.04635(11)#	3.2(8) min	β⁺	²³³Pu
²³³Am	95	138	233.04635(11)#	3.2(8) min	α	²²⁹Np
²³⁴Am	95	139	234.04781(22)#	2.32(8) min	β⁺ (99.95%)	²³⁴Pu
					α (.04%)	²³⁰Np
					β⁺, SF (.0066%)	(various)
²³⁵Am	95	140	235.04795(13)#	9.9(5) min	β⁺	²³⁵Pu	5/2−#
²³⁵Am	95	140	235.04795(13)#	9.9(5) min	α （不常见）	²³¹Np	5/2−#
²³⁶Am	95	141	236.04958(11)#	3.6(1) min	β⁺	²³⁶Pu
²³⁶Am	95	141	236.04958(11)#	3.6(1) min	α	²³²Np
²³⁷Am	95	142	237.05000(6)#	73.0(10) min	β⁺ (99.97%)	²³⁷Pu	5/2(−)
²³⁷Am	95	142	237.05000(6)#	73.0(10) min	α (.025%)	²³³Np	5/2(−)
²³⁸Am	95	143	238.05198(5)	98(2) min	β⁺	²³⁸Pu	1+
²³⁸Am	95	143	238.05198(5)	98(2) min	α (10⁻⁴%)	²³⁴Np	1+
^238mAm	2500(200)# keV			35(10) µs
²³⁹Am	95	144	239.0530245(26)	11.9(1) h	ε (99.99%)	²³⁹Pu	(5/2)−
²³⁹Am	95	144	239.0530245(26)	11.9(1) h	α (.01%)	²³⁵Np	(5/2)−
^239mAm	2500(200) keV			163(12) ns			(7/2+)
²⁴⁰Am	95	145	240.055300(15)	50.8(3) h	β⁺	²⁴⁰Pu	(3−)
²⁴⁰Am	95	145	240.055300(15)	50.8(3) h	α (1.9×10⁻⁴%)	²³⁶Np	(3−)
²⁴¹Am^{[n 2]}	95	146	241.0568291(20)	432.2(7) y	α	²³⁷Np	5/2−
					CD (7.4×10⁻¹⁰%)	²⁰⁷Tl, ³⁴Si
					SF (4.3×10⁻¹⁰%)	(various)
^241mAm	2200(100) keV			1.2(3) µs
²⁴²Am	95	147	242.0595492(20)	16.02(2) h	β⁻ (82.7%)	²⁴²Cm	1−
²⁴²Am	95	147	242.0595492(20)	16.02(2) h	ε (17.3%)	²⁴²Pu	1−
^242m1Am	48.60(5) keV			141(2) y	IT (99.54%)	²⁴²Am	5−
					α (.46%)	²³⁸Np
					SF (1.5×10⁻⁸%)	(various)
^242m2Am	2200(80) keV			14.0(10) ms			(2+,3−)
²⁴³Am^{[n 2]}	95	148	243.0613811(25)	7,370(40) y	α	²³⁹Np	5/2−
²⁴³Am^{[n 2]}	95	148	243.0613811(25)	7,370(40) y	SF (3.7×10⁻⁹%)	(various)	5/2−
²⁴⁴Am	95	149	244.0642848(22)	10.1(1) h	β⁻	²⁴⁴Cm	(6−)#
^244mAm	86.1(10) keV			26(1) min	β⁻ (99.96%)	²⁴⁴Cm	1+
^244mAm	86.1(10) keV			26(1) min	ε (.0361%)	²⁴⁴Pu	1+
²⁴⁵Am	95	150	245.066452(4)	2.05(1) h	β⁻	²⁴⁵Cm	(5/2)+
²⁴⁶Am	95	151	246.069775(20)	39(3) min	β⁻	²⁴⁶Cm	(7−)
^246m1Am	30(10) keV			25.0(2) min	β⁻ (99.99%)	²⁴⁶Cm	2(−)
^246m1Am	30(10) keV			25.0(2) min	IT (.01%)	²⁴⁶Am	2(−)
^246m2Am	~2000 keV			73(10) µs
²⁴⁷Am	95	152	247.07209(11)#	23.0(13) min	β⁻	²⁴⁷Cm	(5/2)#
²⁴⁸Am	95	153	248.07575(22)#	3# min	β⁻	²⁴⁸Cm
²⁴⁹Am	95	154	249.07848(32)#	1# min	β⁻	²⁴⁹Cm

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:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission
↑ ^2.0 ^2.1 Most common isotopes

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:
CD: Cluster decay
EC: Electron capture
IT: Isomeric transition
SF: Spontaneous fission

[c-3] 2.0 ^2.1 Most common isotopes

[1] Universal Nuclide Chart. nucleonica.

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[n 2]