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Alpha-$$gamma$$ decay studies of $$^{255}$$No

$$^{255}$$Noのアルファ・$$gamma$$崩壊核分光

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

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

The decay of $$^{255}$$No was investigated by means of $$alpha$$-$$gamma$$ spectroscopy. The experiment was carried out by using the velocity filter SHIP at GSI. The isotope was produced in the reactions $$^{208}$$Pb($$^{48}$$Ca,n)$$^{255}$$No, $$^{209}$$Bi($$^{48}$$Ca,2n)$$^{255}$$Lr (EC)-$$>$$ $$^{255}$$No, and $$^{238}$$U($$^{22}$$Ne,5n)$$^{255}$$No. Decay data for $$alpha$$-$$gamma$$ coincidence measurements were obtained, and the level structures of the daughter nucleus $$^{251}$$Fm were obtained, including the tentative assignment of (1) 9/2$$^{-}$$ for ground state and (2) 5/2$$^{+}$$ for the 200 keV isomeric state with $$T_{1/2}$$=21 $$mu$$s.

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パーセンタイル:88.34

分野:Physics, Nuclear

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