Surface Localization Of The Dineutron In Li-11

Y. Kubota,A. Corsi,G. Authelet,H. Baba,C. Caesar, D. Calvet,A. Delbart,M. Dozono,J. Feng,F. Flavigny,J. -M. Gheller,J. Gibelin,A. Giganon,A. Gillibert, K. Hasegawa,T. Isobe, Y. Kanaya,S. Kawakami,D. Kim,Y. Kikuchi, Y. Kiyokawa,M. Kobayashi, N. Kobayashi, T. Kobayashi,Y. Kondo,Z. Korkulu,S. Koyama,V. Lapoux,Y. Maeda,F. M. Marqués,T. Motobayashi,T. Miyazaki, T. Nakamura,N. Nakatsuka,Y. Nishio,A. Obertelli,K. Ogata, A. Ohkura,N. A. Orr,S. Ota,H. Otsu,T. Ozaki,V. Panin,S. Paschalis,E. C. Pollacco,S. Reichert,J. -Y. Roussé,A. T. Saito,S. Sakaguchi,M. Sako,C. Santamaria, M. Sasano,H. Sato,M. Shikata, Y. Shimizu, Y. Shindo, L. Stuhl,T. Sumikama,Y. L. Sun,M. Tabata,Y. Togano,J. Tsubota,Z. H. Yang,J. Yasuda, K. Yoneda,J. Zenihiro,T. Uesaka

PHYSICAL REVIEW LETTERS（2020）

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摘要

The formation of a dineutron in the Li-11 nucleus is found to be localized to the surface region. The experiment measured the intrinsic momentum of the struck neutron in Li-11 via the op; pnTHORN knockout reaction at 246 MeV=nucleon. The correlation angle between the two neutrons is, for the first time, measured as a function of the intrinsic neutron momentum. A comparison with reaction calculations reveals the localization of the dineutron at r similar to 3.6 fm. The results also support the density dependence of dineutron formation as deduced from Hartree-Fock-Bogoliubov calculations for nuclear matter.

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