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

doi:10.1103/PhysRevLett.125.252501

Surface Localization of the Dineutron in ^{11}Li

Phys Rev Lett. 2020 Dec 18;125(25):252501. doi: 10.1103/PhysRevLett.125.252501.

Authors

Y Kubota^{1

2}, A Corsi³, G Authelet³, H Baba¹, C Caesar⁴, D Calvet³, A Delbart³, M Dozono², J Feng⁵, F Flavigny⁶, J-M Gheller³, J Gibelin⁷, A Giganon³, A Gillibert³, K Hasegawa⁸, T Isobe¹, Y Kanaya⁹, S Kawakami⁹, D Kim¹⁰, Y Kikuchi^{1

11

12}, Y Kiyokawa², M Kobayashi², N Kobayashi¹³, T Kobayashi⁸, Y Kondo¹⁴, Z Korkulu^{10

15}, S Koyama¹³, V Lapoux³, Y Maeda⁹, F M Marqués⁷, T Motobayashi¹, T Miyazaki¹³, T Nakamura¹⁴, N Nakatsuka¹⁶, Y Nishio¹⁷, A Obertelli³, K Ogata^{12

18}, A Ohkura¹⁷, N A Orr⁷, S Ota², H Otsu¹, T Ozaki¹⁴, V Panin¹, S Paschalis⁴, E C Pollacco³, S Reichert¹⁹, J-Y Roussé³, A T Saito¹⁴, S Sakaguchi¹⁷, M Sako¹, C Santamaria³, M Sasano¹, H Sato¹, M Shikata¹⁴, Y Shimizu¹, Y Shindo¹⁷, L Stuhl^{1

10}, T Sumikama⁸, Y L Sun³, M Tabata¹⁷, Y Togano¹⁴, J Tsubota¹⁴, Z H Yang¹, J Yasuda¹⁷, K Yoneda¹, J Zenihiro¹, T Uesaka^{1

20}

Affiliations

¹ RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
² Center for Nuclear Study, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan.
³ Département de Physique Nucléaire, IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
⁴ Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.
⁵ School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
⁶ IPN Orsay, Université Paris Sud, IN2P3-CNRS, F-91406 Orsay Cedex, France.
⁷ LPC Caen, ENSICAEN, Université de Caen Normandie, CNRS/IN2P3, F-14050 Caen Cedex, France.
⁸ Department of Physics, Tohoku University, Aramaki Aza-Aoba 6-3, Aoba, Sendai, Miyagi 980-8578, Japan.
⁹ Department of Applied Physics, University of Miyazaki, Gakuen-Kibanadai-Nishi 1-1, Miyazaki 889-2192, Japan.
¹⁰ Center for Exotic Nuclear Studies, Institute for Basic Science (IBS), Daejeon 34126, Korea.
¹¹ Tokuyama College, National Institute of Technology, Yamaguchi 745-8585, Japan.
¹² Department of Physics, Osaka City University, Osaka 558-8585, Japan.
¹³ Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan.
¹⁴ Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan.
¹⁵ Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), P.O. Box 51, H-4001 Debrecen, Hungary.
¹⁶ Department of Physics, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502, Japan.
¹⁷ Department of Physics, Kyushu University, Nishi, Fukuoka 819-0395, Japan.
¹⁸ Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
¹⁹ Physik Department, Technische Universität München, D-85748 Garching, Germany.
²⁰ Cluster for Pioneering Research, RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

PMID: 33416401
DOI: 10.1103/PhysRevLett.125.252501

Abstract

The formation of a dineutron in the ^{11}Li nucleus 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∼3.6 fm. The results also support the density dependence of dineutron formation as deduced from Hartree-Fock-Bogoliubov calculations for nuclear matter.