Isotopes of nobelium

Nobelium (No) has no stable isotopes. There are 12 known radioisotopes from ²⁵⁰No to ²⁶²No, and 3 isomers, ^251mNo, ^253mNo, and ^254mNo. The isotope with the longest half-life is ²⁵⁹No with a half-life of 58 minutes. The longest-lived isomer is ^251mNo with a half-life of 1.7 seconds. A standard atomic mass cannot be given due to nobelium being an artificial element.

Table

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	nuclear spin
	excitation energy
250No	102	148	250.08751(22)#	5.7(8) µs	SF (99.95%)	(various)	0+
					α (.05%)	246Fm
					β+ (2.5E-4%)	250Md
251No	102	149	251.08901(19)#	0.78(2) s	α (89%)	247Fm	7/2+#
					SF (10%)	(various)
					β+ (1%)	251Md
251mNo	110(180)# keV			1.7(10) s			9/2-#
252No	102	150	252.088977(14)	2.27(14) s	α (73.09%)	248Fm	0+
					SF (26.9%)	(various)
					β+ (1%)	252Md
253No	102	151	253.09068(11)#	1.62(15) min	α (80%)	249Fm	(9/2-)#
					β+ (20%)	253Md
					SF (1E-3%)	(various)
253mNo	129(19) keV			31 µs			5/2+#
254No	102	152	254.090955(19)	51(10) s	α (89.3%)	250Fm	0+
					β+ (10%)	254Md
					SF (.31%)	(various)
254mNo	500(100)# keV			0.28(4) s	IT (80%)	254No	0+
					α (20%)	250Fm
255No	102	153	255.093241(11)	3.1(2) min	α (61.4%)	251Fm	(1/2+)
					β+ (38.6%)	251Md
256No	102	154	256.094283(8)	2.91(5) s	α (99.44%)	252Fm	0+
					SF (.55%)	(various)
					EC (.01%)	256Md
257No	102	155	257.096877(23)	25(2) s	α (99%)	253Fm	(7/2+)
					β+ (1%)	253Md
258No	102	156	258.09821(22)#	1.2(2) ms	SF (99.99%)	(various)	0+
					α (.01%)	254Fm
					β+β+ (rare)	258Fm
259No	102	157	259.10103(11)#	58(5) min	α (75%)	254Fm	(9/2+)#
					EC (25%)	259Md
					SF (10%)	(various)
260No	102	158	260.10264(22)#	106(8) ms	SF	(various)	0+
262No	102	160	262.10730(48)#	~5 ms	SF	(various)	0+
					β- (rare)	262Lr

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.

History of synthesis of isotopes by cold fusion

²⁰⁸Pb(⁴⁸Ca,xn)^256-xNo (x=1,2,3,4) This cold fusion reaction was first studied in 1979 at the FLNR. Further work in 1988 at the GSI measured EC and SF branchings in ²⁵⁴No. In 1989, the FLNR used the reaction to measure SF decay characteristics for the two isomers of ²⁵⁴No. The measurement of the 2n excitation function was reported in 2001 by Yuri Oganessian at the FLNR.

Patin et al. at the LBNL reported in 2002 the synthesis of ^255-251No in the 1-4n exit channels and measured further decay data for these isotopes.

The reaction has recently been used at the Jyvaskylan Yliopisto Fysiikan Laitos (JYFL) using the RITU set-up to study K-isomerism in ²⁵⁴No. The scientists were able to measure two K-isomers with half-lives of 275 ms and 198 µs, respectively. They were assigned to 8^- and 16⁺ K-isomeric levels.

The reaction was used in 2004-5 at the FLNR to study the spectroscopy of ^255-253No. The team were able to confirm an isomeric level in ²⁵³No with a half-life of 43.5 µs.

²⁰⁸Pb(⁴⁴Ca,xn)^252-xNo (x=2) This reaction was studied in 2003 at the FLNR in a study of the spectroscopy of ²⁵⁰No.

²⁰⁷Pb(⁴⁸Ca,xn)^255-xNo (x=2) The measurement of the 2n excitation function for this reaction was reported in 2001 by Yuri Oganessian and co-workers at the FLNR. The reaction was used in 2004-5 to study the spectroscopy of ²⁵³No.

²⁰⁶Pb(⁴⁸Ca,xn)^254-xNo (x=1,2,3,4) The measurement of the 1-4n excitation functions for this reaction were reported in 2001 by Yuri Oganessian and co-workers at the FLNR. The 2n channel was further studied by the GSI to provide a spectroscopic determination of K-isomerism in ²⁵²No. A K-isomer with spin and parity 8^- was detected with a half-life of 110 ms.

²⁰⁴Pb(⁴⁸Ca,xn)^252-xNo (x=2) The measurement of the 2n excitation function for this reaction was reported in 2001 by Yuri Oganessian at the FLNR. They reported a new isotope ²⁵⁰No with a half-life of 36µs. The reaction was used in 2003 to study the spectroscopy of ²⁵⁰No.They were able to observe two spontaneous fission activities with half-lives of 5.6µs and 54µs and assigned to ²⁵⁰No and ²⁴⁹No, respectively. The latter activity was later assigned to a K-isomer in ²⁵⁰No. The reaction was reported in 2006 by Peterson et al. at the Argonne National Laboratory (ANL) in a study of SF in ²⁵⁰No. They detected two activities with half-lives of 3.7 µs and 43 µs and both assigned to ²⁵⁰No, the latter associated with a K-isomer.

History of synthesis of isotopes by hot fusion

²³²Th(²⁶Mg,xn)^258-xNo (x=4,5,6) The cross sections for the 4-6n exit channels have been measured for this reaction at the FLNR.

²³⁸U(²²Ne,xn)^260-xNo (x=4,5,6) This reaction was first studied in 1964 at the FLNR. The team were able to detect decays from ²⁵²Fm and ²⁵⁰Fm. The ²⁵²Fm activity was associated with an ~8 s half-life and assigned to ²⁵⁶102 from the 4n channel, with a yield of 45 nb. They were also able to detect a 10 s spontaneous fission activity also tentatively assigned to ²⁵⁶102. Further work in 1966 on the reaction examined the detection of ²⁵⁰Fm decay using chemical separation and a parent activity with a half-life of ~50 s was reported and correctly assigned to ²⁵⁴102. They also detected a 10 s spontaneous fission activity tentatively assigned to ²⁵⁶102. The reaction was used in 1969 to study some initial chemistry of nobelium at the FLNR. They determined eka-ytterbium properties, consistent with nobelium as the heavier homologue. In 1970, they were able to study the SF properties of ²⁵⁶No. In 2002, Patin et al. reported the synthesis of ²⁵⁶No from the 4n channel but were unable to detect ²⁵⁷No.

The cross section values for the 4-6n channels have also been studied at the FLNR.

²³⁸U(²⁰Ne,xn)^258-xNo This reaction was studied in 1964 at the FLNR. No spontaneous fission activities were observed.

²³⁶U(²²Ne,xn)^258-xNo (x=4,5,6) The cross sections for the 4-6n exit channels have been measured for this reaction at the FLNR.

²³⁵U(²²Ne,xn)^257-xNo (x=5) This reaction was studied in 1970 at the FLNR. It was used to study the SF decay properties of ²⁵²No.

²³³U(²²Ne,xn)^255-xNo The synthesis of neutron deficient nobelium isotopes was studied in 1975 at the FLNR. In their experiments they observed a 250 µs SF activity which they tentatively assigned to ²⁵⁰No in the 5n exit channel. Later results have not been able to confirm this activity and it is currently unidentified.

²⁴²Pu(¹⁸O,xn)^260-xNo (x=4?) This reaction was studied in 1966 at the FLNR. The team identified an 8.2 s SF activity tentatively assigned to ²⁵⁶102.

²⁴¹Pu(¹⁶O,xn)^257-xNo This reaction was first studied in 1958 at the FLNR. The team measured ~8.8 MeV alpha particles with a half-life of 30 s and assigned to ^253,252,251102. A repeat in 1960 produced 8.9 MeV alpha particles with a half-life of 2-40 s and assigned to ²⁵³102 from the 4n channel. Confidence in these results was later diminished.

²³⁹Pu(¹⁸O,xn)^257-xNo (x=5) This reaction was studied in 1970 at the FLNR in an effort to study the SF decay properties of ²⁵²No.

²³⁹Pu(¹⁶O,xn)^255-xNo This reaction was first studied in 1958 at the FLNR. The team were able to measure ~8.8 MeV alpha particles with a half-life of 30 s and assigned to ^253,252,251102. A repeat in 1960 was unsuccessful and it was concluded the first results were probably associated with background effects.

²⁴³Am(¹⁵N,xn)^258-xNo (x=4) This reaction was studied in 1966 at the FLNR. The team were able to detect ²⁵⁰Fm using chemical techniques and determined an associated half-life significantly higher than the reported 3 s by Berkeley for the supposed parent ²⁵⁴No. Further work later the same year measured 8.1 MeV alpha particles with a half-life of 30-40 s.

²⁴³Am(¹⁴N,xn)^257-xNo This reaction was studied in 1966 at the FLNR. They were unable to detect the 8.1 MeV alpha particles detected when using a N-15 beam.

²⁴¹Am(¹⁵N,xn)^256-xNo (x=4) The decay properties of ²⁵²No were examined in 1977 at Oak Ridge. The team calculated a half-life of 2.3 s and measured a 27% SF branching.

²⁴⁸Cm(¹⁸O,αxn)^262-xNo (x=3) The synthesis of the new isotope ²⁵⁹No was reported in 1973 from the LBNL using this reaction.

²⁴⁸Cm(¹³C,xn)^261-xNo (x=3?,4,5) This reaction was first studied in 1967 at the LBNL. The new isotopes ²⁵⁸No,²⁵⁷No and ²⁵⁶No were detected in the 3-5n channels. The reaction was repeated in 1970 to provide further decay data for ²⁵⁷No.

²⁴⁸Cm(¹²C,xn)^260-xNo (4,5?) This reaction was studied in 1967 at the LBNL in their seminal study of nobelium isotopes. The reaction was used in 1990 at the LBNL to study the SF of ²⁵⁶No.

²⁴⁶Cm(¹³C,xn)^259-xNo (4?,5?) This reaction was studied in 1967 at the LBNL in their seminal study of nobelium isotopes.

²⁴⁶Cm(¹²C,xn)^258-xNo (4,5) This reaction was studied in 1958 by scientists at the LBNL using a 5% ²⁴⁶Cm curium target. They were able to measure 7.43 MeV decays from ²⁵⁰Fm, associated with a 3 s ²⁵⁴No parent activity, resulting from the 4n channel. The 3 s activity was later reassigned to ²⁵²No, resulting from reaction with the predominant ²⁴⁴Cm component in the target. It could however not be proved that it was not due to the contaminant ^250mFm, unknown at the time. Later work in 1959 produced 8.3 MeV alpha particles with a half-life of 3 s and a 30% SF branch. This was initially assigned to ²⁵⁴No and later reassigned to ²⁵²No, resulting from reaction with the ²⁴⁴Cm component in the target. The reaction was restudied in 1967 and activities assigned to ²⁵⁴No and ²⁵³No were detected.

²⁴⁴Cm(¹³C,xn)^257-xNo (x=4) This reaction was first studied in 1957 at the Nobel Institute in Stockholm. The scientists detected 8.5 MeV alpha particles with a half-life of 10 minutes. The activity was assigned to ²⁵¹No or ²⁵³No. The results were later dismissed as background. The reaction was repeated by scientists at the LBNL in 1958 but they were unable to confirm the 8.5 MeV alpha particles. The reaction was further studied in 1967 at the LBNL and an activity assigned to ²⁵³No was measured.

²⁴⁴Cm(¹²C,xn)^256-xNo (x=4,5) This reaction was studied in 1958 by scientists at the LBNL using a 95% ²⁴⁴Cm curium target. They were able to measure 7.43 MeV decays from ²⁵⁰Fm, associated with a 3 s ²⁵⁴No parent activity, resulting from the reaction (²⁴⁶Cm,4n). The 3 s activity was later reassigned to ²⁵²No, resulting from reaction (²⁴⁴Cm,4n). It could however not be proved that it was not due to the contaminant ^250mFm, unknown at the time. Later work in 1959 produced 8.3 MeV alpha particles with a half-life of 3 s and a 30% SF branch. This was initially assigned to ²⁵⁴No and later reassigned to ²⁵²No, resulting from reaction with the ²⁴⁴Cm component in the target. The reaction was restudied in 1967 at the LBNL and an new activity assigned to ²⁵¹No was measured.

²⁵²Cf(¹²C,αxn)^260-xNo (x=3?) This reaction was studied at the LBNL in 1961 as part of their search for element 104. They detected 8.2 MeV alpha particles with a half-life of 15 s. This activity was assigned to a Z=102 isotope. Later work suggests an assignment to ²⁵⁷No, resulting most likely from the α3n channel with the ²⁵²Cf component of the californium target.

²⁵²Cf(¹¹B,pxn)^262-xNo (x=5?) This reaction was studied at the LBNL in 1961 as part of their search for element 103. They detected 8.2 MeV alpha particles with a half-life of 15 s. This activity was assigned to a Z=102 isotope. Later work suggests an assignment to ²⁵⁷No, resulting most likely from the p5n channel with the ²⁵²Cf component of the californium target.

²⁴⁹Cf(¹²C,αxn)^257-xNo (x=2) This reaction was first studied in 1970 at the LBNL in a study of ²⁵⁵No. It was studied in 1971 at the Oak Ridge Laboratory. They were able to measure coincident Z=100 K X-rays from ²⁵⁵No, confirming the discovery of the element.

References

• Isotope masses from:
  • G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.{{cite journal}}: CS1 maint: multiple names: authors list (link)
• Isotopic compositions and standard atomic masses from:
  • J. R. de Laeter, J. K. Böhlke, P. De Bièvre, H. Hidaka, H. S. Peiser, K. J. R. Rosman and P. D. P. Taylor (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  • M. E. Wieser (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051. {{cite journal}}: Unknown parameter |laysummary= ignored (help)
• Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
  • G. Audi, A. H. Wapstra, C. Thibault, J. Blachot and O. Bersillon (2003). "The NUBASE evaluation of nuclear and decay properties" (PDF). Nuclear Physics A. 729: 3–128. doi:10.1016/j.nuclphysa.2003.11.001.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  • National Nuclear Data Center. "NuDat 2.1 database". Brookhaven National Laboratory. Retrieved September 2005. {{cite web}}: Check date values in: |accessdate= (help)
  • N. E. Holden (2004). "Table of the Isotopes". In D. R. Lide (ed.). CRC Handbook of Chemistry and Physics (85th ed.). CRC Press. Section 11. ISBN 978-0849304859. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)