Physics Letters B (Mar 2021)
Three-body breakup of 6He and its halo structure
- Y.L. Sun,
- T. Nakamura,
- Y. Kondo,
- Y. Satou,
- J. Lee,
- T. Matsumoto,
- K. Ogata,
- Y. Kikuchi,
- N. Aoi,
- Y. Ichikawa,
- K. Ieki,
- M. Ishihara,
- T. Kobayshi,
- T. Motobayashi,
- H. Otsu,
- H. Sakurai,
- T. Shimamura,
- S. Shimoura,
- T. Shinohara,
- T. Sugimoto,
- S. Takeuchi,
- Y. Togano,
- K. Yoneda
Affiliations
- Y.L. Sun
- Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China; Département de Physique Nucléaire, IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France; Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany; Corresponding author at: Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
- T. Nakamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- Y. Kondo
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- Y. Satou
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- J. Lee
- Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China
- T. Matsumoto
- Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
- K. Ogata
- Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan; Department of Physics, Osaka City University, Osaka 558-8585, Japan
- Y. Kikuchi
- National Institute of Technology, Tokuyama College, Shunan 745-8585, Japan; RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- N. Aoi
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Y. Ichikawa
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- K. Ieki
- Departiment of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
- M. Ishihara
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- T. Kobayshi
- Department of Physics, Tohoku University, Miyagi 980-8578, Japan
- T. Motobayashi
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Otsu
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- H. Sakurai
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- T. Shimamura
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- S. Shimoura
- Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
- T. Shinohara
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- T. Sugimoto
- Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan
- S. Takeuchi
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Y. Togano
- Departiment of Physics, Rikkyo University, Toshima, Tokyo 171-8501, Japan
- K. Yoneda
- RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
- Journal volume & issue
-
Vol. 814
p. 136072
Abstract
The Borromean halo nucleus 6He has been studied by a kinematically complete measurement of Coulomb and nuclear breakup into α + 2n on Pb and C targets at 70 MeV/nucleon. Fully quantum-mechanical four-body breakup calculations reproduce the energy and angular differential cross sections below Erel∼1 MeV for both targets. The model used here reproduces the 6He ground-state properties as well as α-n and n-n scattering data and predicts an average opening angle 〈θnn〉 of 68∘ between the two halo neutrons. However, the model underestimates the breakup cross sections for higher Erel, indicating a possible contribution from the inelastic breakup. Alternatively, we examine the empirically modified calculations that reproduce the energy-differential cross sections for a wide range of scattering angles for both targets. The extracted B(E1) peaks at Erel∼1.4 MeV and amounts to 1.6(2) e2fm2 for Erel ≤ 20 MeV, resulting 〈θnn〉 = 56−10+9 degrees. In either interpretation, the current results show evidence of the dineutron spatial correlation in 6He.
