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Report No.
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Identification of a K isomer in $$^{252}$$No

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

The $$K$$-isomer with a half-life of 100 ms has been discovered in the nucleus $$^{252}$$No. The nucleus was produced in the fusion-evaporation reacion $$^{206}$$Pb($$^{48}$$Ca,2n)$$^{252}$$No. The experiment was carried out at the velocity filter SHIP of GSI. The isomeric state is located at an excitation energy of 1254 keV and is interpreted as a two quasi-neutron state with $$K$$=8$$^{-}$$. The isomeric state has direct connection to the rotational states of 8$$^{+}$$ in $$^{252}$$No. Also the rotational states of 6$$^{+}$$ and 4$$^{+}$$ was feeded via the octupole band with $$K$$=2$$^{-}$$. The isomeric state and the ground state was populated with the equal intensity in the fusion-evaporation reaction.

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Category:Physics, Nuclear

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