Isotopes of rutherfordium

Rutherfordium (Rf) has no stable isotopes. A standard atomic mass cannot be given.

Rutherfordium has also been called dubnium and kurchatovium.

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)
²⁵³Rf	104	149	253.10069(49)#	13(5) ms	(7/2)(+#)
^253mRf	200(150)# keV			52(14) µs [48(+17-10) µs]	(1/2)(-#)
²⁵⁴Rf	104	150	254.10018(31)#	23(3) µs	0+
²⁵⁵Rf	104	151	255.10134(19)#	1.64(11) s	(9/2-)#
^255mRf	-80(180)# keV			1.0(4) s [0.8(+5-2) s]	5/2+#
²⁵⁶Rf	104	152	256.101166(26)	6.45(14) ms	0+
²⁵⁷Rf	104	153	257.10299(11)#	4.7(3) s	(1/2+)
^257mRf	114(17) keV			3.9(4) s	(11/2-)
²⁵⁸Rf	104	154	258.10349(22)#	12(2) ms	0+
²⁵⁹Rf	104	155	259.10564(8)#	2.8(4) s	7/2+#
²⁶⁰Rf	104	156	260.10644(22)#	21(1) ms	0+
²⁶¹Rf	104	157	261.10877(3)	5.5(25) s	3/2+#
^261mRf	70(100)# keV			81(9) s	9/2+#
²⁶²Rf	104	158	262.10993(30)#	2.3(4) s	0+
^262mRf	600(400)# keV			47(5) ms	high
²⁶³Rf	104	159	263.11255(20)#	11(3) min	3/2+#
²⁶⁴Rf	104	160	264.11399(48)#	1# h	0+
²⁶⁵Rf	104	161	265.11670(46)#	13 h	3/2+#
²⁶⁶Rf	104	162	266.11796(58)#	10# h	0+
²⁶⁷Rf	104	163	267.12153(62)#	5# h [2.3(+980-17) h]
²⁶⁸Rf	104	164	268.12364(76)#	1# h	0+

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.

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.

Isotopes of lawrencium	Isotopes of rutherfordium	Isotopes of dubnium
Index to isotope pages

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