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, Y. Kikuchi, Y. KiyokawaM. 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, M. Tabata, Y. Togano, J. Tsubota, J. Yasuda, K. Yoneda, J. Zenihiro, T. Uesaka

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The formation of a dineutron in the Li11 nucleus is found to be localized to the surface region. The experiment measured the intrinsic momentum of the struck neutron in Li11 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∼3.6 fm. The results also support the density dependence of dineutron formation as deduced from Hartree-Fock-Bogoliubov calculations for nuclear matter.

Original languageEnglish
Article number252501
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 16 Dec 2020

Bibliographical note

Funding Information:
We extend our appreciation to the RIKEN Nishina Center, the Center for Nuclear Study, The University of Tokyo, and the accelerator staff for their efforts in delivering an intense beam. We also would like to thank K. Hagino for the helpful discussion. The development of MINOS and the core MINOS team were supported by the European Research Council through the ERC (Grant No. MINOS-258567). This work was supported in part by KAKENHI (Grants No. JP16K05352, No. JP16H02179, and No. JP18H05404). D. K. acknowledges support from the Rare Isotope Science Project of Institute for Basic Science funded by the Ministry of Science and ICT and NRF of Korea (No. NRF-2013M7A1A1075764 and No. NRF-2019R1I1A1A01058354). L. S. acknowledges support from the Institute for Basic Science (IBS-R031-D1). J. G., F. M. M., and N. A. O. acknowledge partial support from the French-Japanese LIA-International Associated Laboratory for Nuclear Structure Problems as well as the French ANR14-CE33-0022-02 EXPAND.

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