TY - JOUR
T1 - Three-body breakup of 6He and its halo structure
AU - Sun, Y. L.
AU - Nakamura, T.
AU - Kondo, Y.
AU - Satou, Y.
AU - Lee, J.
AU - Matsumoto, Takuma
AU - Ogata, K.
AU - Kikuchi, Y.
AU - Aoi, N.
AU - Ichikawa, Y.
AU - Ieki, K.
AU - Ishihara, M.
AU - Kobayshi, T.
AU - Motobayashi, T.
AU - Otsu, H.
AU - Sakurai, H.
AU - Shimamura, T.
AU - Shimoura, S.
AU - Shinohara, T.
AU - Sugimoto, T.
AU - Takeuchi, S.
AU - Togano, Y.
AU - Yoneda, K.
N1 - Funding Information:
Sincere gratitude is extended to the accelerator staff of RIKEN for their excellent operation of the beam delivery. Y. L. S. acknowledge the support of Marie Skłodowska-Curie Individual Fellowship (H2020-MSCA-IF-2015-705023) from the European Union and the support from the Alexander von Humboldt Foundation. This work was also supported by JSPS KAKENHI Grants No. JP16H02179 and No. JP18H05404.
Funding Information:
Sincere gratitude is extended to the accelerator staff of RIKEN for their excellent operation of the beam delivery. Y. L. S. acknowledge the support of Marie Skłodowska-Curie Individual Fellowship ( H2020-MSCA-IF-2015-705023 ) from the European Union and the support from the Alexander von Humboldt Foundation . This work was also supported by JSPS KAKENHI Grants No. JP16H02179 and No. JP18H05404 .
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/3/10
Y1 - 2021/3/10
N2 - 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) e2 fm2 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.
AB - 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) e2 fm2 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.
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U2 - 10.1016/j.physletb.2021.136072
DO - 10.1016/j.physletb.2021.136072
M3 - Article
AN - SCOPUS:85099611157
SN - 0370-2693
VL - 814
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 136072
ER -