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Unexpectedly enhanced $$alpha$$-particle preformation in $$^{48}$$Ti probed by the ($$p$$,$$palpha$$) reaction

($$p$$,$$palpha$$)反応で明らかになった$$^{48}$$Ti中での予想外に多い$$alpha$$粒子形成

谷口 億宇*; 吉田 数貴; 千葉 陽平*; 延与 佳子*; 木村 真明*; 緒方 一介*

Taniguchi, Yasutaka*; Yoshida, Kazuki; Chiba, Yohei*; Kanada-En'yo, Yoshiko*; Kimura, Masaaki*; Ogata, Kazuyuki*

本研究では、$$^{48}$$Ti($$p$$,$$palpha$$)$$^{44}$$Ca反応の分析により、中重核である$$^{48}$$Tiでの$$alpha$$粒子形成が平均場近似で予想される量よりも顕著に大きいことを明らかにした。さらに、示唆される$$alpha$$粒子と$$^{44}$$Ca間のクラスター間平均距離はおよそ4.5fmであり、これは微視的構造理論での4核子$$alpha$$相関の記述に課題をもたらす結果である。

Based on the $$^{48}$$Ti($$p$$,$$palpha$$)$$^{44}$$Ca reaction analysis, this study reports that $$alpha$$-particle formation in the medium-mass $$^{48}$$Ti nucleus is pronounced more compared to that expected through mean-field approximations. Moreover, the estimated average distance between the $$alpha$$ particle and residue equals approximately 4.5 fm. This result poses a challenge to describe the four nucleon correlations using microscopic nuclear models.

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