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Coulomb excitation of $$^{156}$$Gd

Sugawara, Masahiko*; Kusakari, Hideshige*; Yoshizawa, Hirokazu*; Inoue, Hikaru*; Morikawa, Tsuneyasu*; Shizuma, Toshiyuki; Srebrny, J.*

Multiple Coulomb-excitation experiments for $$^{156}$$Gd were made with a 118 MeV $$^{32}$$S beam and a 225 MeV $$^{58}$$Ni beam. The ground-state band, the $$beta$$ band ($$K$$=0$$^{+}$$), and the $$gamma$$ band ($$K$$=2$$^{+}$$) were observed up to the 18$$^+$$, 14$$^+$$, and 12$$^+$$ states, respectively, while the octupole band ($$K$$=1$$^{-}$$) was observed up to the 15$$^-$$ state, through the analysis of particle-$$gamma$$-$$gamma$$ data. The intrinsic matrix elements entering the generalized intensity relations were obtained so as to reproduce the spin dependence of the $$E$$2 matrix elements extracted from the experimental results of particle-$$gamma$$ angular correlation for the transitions within each band and between each band and the ground-state band by the least-squares search code gosia. The change of characters in the $$beta$$ and $$gamma$$ bands is discussed as a possible cause for the variation of the $$E$$2 matrix elements in the higher-spin region.

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Category:Physics, Nuclear

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