Isotopes of krypton

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Krypton (Kr)
Standard atomic mass: 83.798(2) u

[edit] 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)
nuclide symbol	excitation energy			half-life	nuclear spin	representative isotopic composition (mole fraction)	range of natural variation (mole fraction)
⁶⁹Kr	36	33	68.96518(43)#	32(10) ms	5/2-#
⁷⁰Kr	36	34	69.95526(41)#	52(17) ms	0+
⁷¹Kr	36	35	70.94963(70)	100(3) ms	(5/2)-
⁷²Kr	36	36	71.942092(9)	17.16(18) s	0+
⁷³Kr	36	37	72.939289(7)	28.6(6) s	3/2-
^73mKr	433.66(12) keV			107(10) ns	(9/2+)
⁷⁴Kr	36	38	73.9330844(22)	11.50(11) min	0+
⁷⁵Kr	36	39	74.930946(9)	4.29(17) min	5/2+
⁷⁶Kr	36	40	75.925910(4)	14.8(1) h	0+
⁷⁷Kr	36	41	76.9246700(21)	74.4(6) min	5/2+
⁷⁸Kr	36	42	77.9203648(12)	STABLE [>1.1E+20 a]	0+	0.00355(3)
⁷⁹Kr	36	43	78.920082(4)	35.04(10) h	1/2-
^79mKr	129.77(5) keV			50(3) s	7/2+
⁸⁰Kr	36	44	79.9163790(16)	STABLE	0+	0.02286(10)
⁸¹Kr	36	45	80.9165920(21)	2.29(11)E+5 a	7/2+
^81mKr	190.62(4) keV			13.10(3) s	1/2-
⁸²Kr	36	46	81.9134836(19)	STABLE	0+	0.11593(31)
⁸³Kr	36	47	82.914136(3)	STABLE	9/2+	0.11500(19)
^83m1Kr	9.4053(8) keV			154.4(11) ns	7/2+
^83m2Kr	41.5569(10) keV			1.83(2) h	1/2-
⁸⁴Kr	36	48	83.911507(3)	STABLE	0+	0.56987(15)
^84mKr	3236.02(18) keV			1.89(4) µs	8+
⁸⁵Kr	36	49	84.9125273(21)	10.776(3) a	9/2+
^85m1Kr	304.871(20) keV			4.480(8) h	1/2-
^85m2Kr	1991.8(13) keV			1.6(7) µs [1.2(+10-4) µs]	(17/2+)
⁸⁶Kr	36	50	85.91061073(11)	STABLE	0+	0.17279(41)
⁸⁷Kr	36	51	86.91335486(29)	76.3(5) min	5/2+
⁸⁸Kr	36	52	87.914447(14)	2.84(3) h	0+
⁸⁹Kr	36	53	88.91763(6)	3.15(4) min	3/2(+#)
⁹⁰Kr	36	54	89.919517(20)	32.32(9) s	0+
⁹¹Kr	36	55	90.92345(6)	8.57(4) s	5/2(+)
⁹²Kr	36	56	91.926156(13)	1.840(8) s	0+
⁹³Kr	36	57	92.93127(11)	1.286(10) s	1/2+
⁹⁴Kr	36	58	93.93436(32)#	210(4) ms	0+
⁹⁵Kr	36	59	94.93984(43)#	114(3) ms	1/2(+)
⁹⁶Kr	36	60	95.94307(54)#	80(7) ms	0+
⁹⁷Kr	36	61	96.94856(54)#	63(4) ms	3/2+#
⁹⁸Kr	36	62	97.95191(64)#	46(8) ms	0+
⁹⁹Kr	36	63	98.95760(64)#	40(11) ms	(3/2+)#
¹⁰⁰Kr	36	64	99.96114(54)#	10# ms [>300 ns]	0+

[edit] Notes

The isotopic composition refers to that in air.
Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
Commercially available materials may have been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations from the given mass and composition can occur.
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.

[edit] References

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.