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

GARIS焦点面に設置したSi-Ge検出器アレイを用いた最初の$$alpha$$-$$gamma$$核分光実験

加治 大哉*; 森本 幸司*; 若林 泰生*; 武山 美麗*; 浅井 雅人

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

超重核の$$alpha$$-$$gamma$$(X線)核分光実験を行うため、ガス充填型反跳イオン分離装置GARISの焦点面に新たにSi-Ge検出器アレイを導入した。このアレイの性能を$$^{207}$$Pb($$^{48}$$Ca,2n)$$^{253}$$No反応および$$^{208}$$Pb($$^{48}$$Ca,xn)$$^{256-x}$$No [x=1,2,3]反応を用いて試験した。$$alpha$$線との同時計数測定により$$^{253}$$Noと$$^{255}$$Noの$$alpha$$崩壊に伴う$$gamma$$線を明瞭に観測することに成功した。

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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