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Investigation of $$alpha$$ clustering with knockout reactions

Yoshida, Kazuki; Ogata, Kazuyuki*; Kanada-En'yo, Yoshiko*

In $$alpha$$ clustering studies, it is very important to probe the $$alpha$$ cluster amplitude at nuclear surface since $$alpha$$ spectroscopic factor is not necessarily a direct measure of the $$alpha$$ clustering. We consider $$^{20}$$Ne($$p$$,$$palpha$$)$$^{16}$$O and $$^{120}$$Sn($$p$$,$$palpha$$)$$^{116}$$Cd at 100 - 400 MeV within the distorted wave impulse approximation (DWIA) framework. We introduce a $textit{masking function}$ which shows how the reaction amplitude in the nuclear interior is suppressed and defines the probed region of the $$alpha$$ cluster wave function. It is clearly shown by means of the masking function that thanks to the absorption of distorting potentials, the $$alpha$$ knockout reaction probes the $$alpha$$ cluster amplitude in the nuclear surface region, which is the direct measure of well-developed $$alpha$$ cluster states.

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Category:Physics, Nuclear

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