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Discovery of $$K$$-isomeric states in seaborgium isotopes

M$v{o}$sat', P.*; Andel, B.*; Khuyagbaatar, J.*; 西尾 勝久   ; 他10名*

M$v{o}$sat', P.*; Andel, B.*; Khuyagbaatar, J.*; Nishio, Katsuhisa; 10 of others*

The $$K$$-isomeric states in the heaviest nuclei are one of the interesting topics in the superheavy element research. In the present work, we report on the discovery of $$mu$$-isomers in $$^{258,259,260,261}$$Sg. The isomeric states deexcite with half-lives of 120$$^{+578}_{-55}$$ $$mu$$s, 85$$pm$$6 $$mu$$s, 8.5$$^{+3.1}_{-1.8}$$ $$mu$$s and 12.6$$^{+2.2}_{-1.6}$$ $$mu$$s measured for $$^{258}$$Sg, $$^{259}$$Sg, $$^{260}$$Sg and $$^{261}$$Sg, respectively, and are attributed to originate from high-$$K$$ states formed in the multi-quasiparticle couplings.

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