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First $$alpha$$-$$gamma$$ spectroscopy using Si-Ge detector array installed at focal plane of GARIS

Kaji, Daiya*; Morimoto, Koji*; Wakabayashi, Yasuo*; Takeyama, Mirei*; Asai, Masato  

A Si-Ge detector array was newly installed at the focal plane of the gas-filled recoil ion separator GARIS to perform $$alpha$$-$$gamma$$ (X-rays) spectroscopy for superheavy nuclei. The performance of the array was tested using the $$^{207}$$Pb($$^{48}$$Ca,2n)$$^{253}$$No and $$^{208}$$Pb($$^{48}$$Ca,xn)$$^{256-x}$$No [x=1,2,3] reactions. $$gamma$$ rays originating from the $$alpha$$ decay of $$^{253}$$No and $$^{255}$$No were clearly observed in prompt coincidence with the $$alpha$$ particles.



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