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A New isomer in $$^{136}$$Ba populated by deep inelastic collisions

Shizuma, Toshiyuki; Gan, Z. G.*; Ogawa, Kengo*; Nakada, Hitoshi*; Oshima, Masumi; Toh, Yosuke   ; Hayakawa, Takehito; Hatsukawa, Yuichi; Sugawara, Masahiko*; Utsuno, Yutaka   ; Liu, Z.*

Excited states in $$^{136}$$Ba, populated in deep-inelastic collisions by the interaction of 450-MeV $$^{82}$$Se ions with a $$^{139}$$La target, have been studied by means of in-beam $$gamma$$-ray spectroscopy. A new isomer with $$I^pi=(10^+)$$ has been identified at an excitation energy of $$E_x=3.357$$ MeV. The half-life was determined as $$T_{1/2}=94pm10$$ ns. The extracted $$B(E2)$$ value is much smaller than those in $$^{132}$$Te and $$^{134}$$Xe. This hindrance is investigated by a shell model calculation.

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Category:Physics, Nuclear

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