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Fine-structure $$alpha$$-decay spectroscopy of superheavy nuclei

超重核の$$alpha$$崩壊微細構造分光

浅井 雅人  

Asai, Masato

超重核の核構造を実験的に明らかにするためには、基底状態や励起準位の構造を核分光学的手法により明らかにすることが最も効果的である。特に$$alpha$$崩壊微細構造分光は、$$alpha$$線測定のみから分光学的情報が得られるため、非常に高感度な方法として期待される。しかし、超重核の$$alpha$$線を高エネルギー分解能で測定することは難しい。加えて、コインシデンスサム効果によって観測される$$alpha$$線のエネルギースペクトルが大きく歪む。どのようにこれらの困難を克服するか、その結果$$alpha$$崩壊微細構造分光が超重元素の核構造研究にどれ程有益かを示したい。

To investigate nuclear structure of superheavy nuclei experimentally, spectroscopic methods which can reveal level structure of ground- and excited states are the most effective. In particular, fine-structure $$alpha$$-decay spectroscopy is expected to be a very sensitive method because spectroscopic information can be obtained only through $$alpha$$-particle measurements. However, it is difficult to measure $$alpha$$ particles of superheavy nuclei with high energy resolution. Moreover, the observed $$alpha$$ energy spectra are significantly distorted by coincidence summing effects. I would like to demonstrate how we can overcome these difficulties, and how useful the fine-structure $$alpha$$-decay spectroscopy is to investigate nuclear structure of superheavy nuclei.

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