An in-beam study of excited states in the transfermium nucleus ${}^{252}\mathrm{No}$ has been performed using the recoil separator RITU together with the JUROSPHERE II array at the University of Jyväskylä. This is the second transfermium nucleus studied in an in-beam experiment. Levels up to spin 20 were populated and compared to levels in ${}^{254}\mathrm{No}.$ An upbend is seen at a frequency of 200 keV/ħ corresponding to spin 16. We also use an improved systematics to connect the energy of the lowest $2^{+}$ state with its half-life and find that the deformation of both ${}^{252,254}\mathrm{No}$ is slightly larger than previously assumed.

• Received 20 July 2001

DOI:https://doi.org/10.1103/PhysRevC.65.014303