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Surface localization of the dineutron in ¹¹Li

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arxiv 2010.04802 v1 pith:WANEPY2P submitted 2020-10-09 nucl-ex

Surface localization of the dineutron in ¹¹Li

Y. Kubota , A. Corsi , G. Authelet , H. Baba , C. Caesar , D. Calvet , A. Delbart , M. Dozono
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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. Marqu\'es 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. Rouss\'e 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
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keywords dineutroncalculationsformationintrinsiclocalizationmeasuredmomentumneutron
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The formation of a dineutron in the nucleus $^{11}$Li is found to be localized to the surface region. The experiment measured the intrinsic momentum of the struck neutron in $^{11}$Li via the $(p,pn)$ 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 $r\sim3.6$ 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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