Nobelium - Isotopes

Isotopes

Twelve radioisotopes of nobelium have been characterized, with the most stable being 259No with a half-life of 58 minutes. Longer half-lives are expected for the as-yet-unknown 261No and 263No. An isomeric level has been found in 253No and K-isomers have been found in 250No, 252No and 254No to date.

Chronology of isotope discovery
Isotope Year discovered Discovery reaction
250Nom 2001 204Pb(48Ca,2n)
250Nog 2006 204Pb(48Ca,2n)
251No 1967 244Cm(12C,5n)
252Nog 1959 244Cm(12C,4n)
252Nom ~2002 206Pb(48Ca,2n)
253Nog 1967 242Pu(16O,5n),239Pu(18O,4n)
253Nom 1971 249Cf(12C,4n)
254Nog 1966 243Am(15N,4n)
254Nom1 1967? 246Cm(13C,5n),246Cm(12C,4n)
254Nom2 ~2003 208Pb(48Ca,2n)
255No 1967 246Cm(13C,4n),248Cm(12C,5n)
256No 1967 248Cm(12C,4n),248Cm(13C,5n)
257No 1961?, 1967 248Cm(13C,4n)
258No 1967 248Cm(13C,3n)
259No 1973 248Cm(18O,α3n)
260No ? 254Es + 22Ne,18O,13C - transfer
261No unknown
262No 1988 254Es + 22Ne - transfer (EC of 262Lr)

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