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arXiv · 2010.04802

Surface localization of the dineutron in $^{11}$Li

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
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Abstract

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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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. 2020-10-09. Surface localization of the dineutron in $^{11}$Li. https://doi.org/10.1103/physrevlett.125.252501

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