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Report No.

Decay studies of new isomeric states in $$^{255}$$No

Bronis, A.*; He${ss}$berger, F. P.*; Antalic, S.*; Andel, B.*; Ackermann, D.*; Heinz, S.*; Hofmann, S.*; Khuyagbaatar, J.*; Kindler, B.*; Kojouharov, I.*; Kuusiniemi, P.*; Leino, M.*; Lommel, B.*; Mann, R.*; Nishio, Katsuhisa   ; Popeko, A. G.*; Streicher, B.*; Sulignano, B.*; Uusitalo, J.*; Venhart, M.*; Yeremin, A.*

The decay of excited states in $$^{255}$$No was investigated by applying the evaporation-residue-conversion-electron correlation technique. Two new isomeric states were observed in $$^{255}$$No together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and $$gamma$$ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in $$^{255}$$No is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2$$^{-}$$[725] Nilsson level for heavy $$N$$=153 isotones as a function of increasing proton number is confirmed.



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Category:Physics, Nuclear



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