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SUMMARY:”Effective field theory for weakly bound two-neutron halo nuclei
  ”by Dr. Masaru Hongo\, Associate Professor (Niigata University)
DTSTART:20251104T043000Z
DTEND:20251104T060000Z
DTSTAMP:20260617T223400Z
UID:indico-event-5383@indico2.riken.jp
DESCRIPTION:Lecturer： Dr. Masaru Hongo\, Associate Professor\, Niigata U
 niversity\n講師： 本郷 優 氏\,  新潟大学准教授\nPlace and T
 ime：\n4th November（Tuesday）13：30～  RIBF Coneference Hall\n開
 催日時：\n１１月４日 火曜日 １３時半より RIBF棟大会
 議室\nTitle: Effective field theory for weakly bound two-neutron halo nu
 clei \nAbstract:\nWe develop an effective field theory (EFT) framework fo
 r weakly bound two-neutron halo nuclei\, or Borromean systems such as 22C\
 , where the two-neutron separation energy and the neutron–neutron virtua
 l energy constitute the lowest energy scales of the problem. At leading or
 der\, the EFT involves a single dimensionless coupling exhibiting universa
 l scaling behavior. We demonstrate that key observables\, including the ra
 tio of matter and charge radii\, the electric dipole (E1) strength functio
 n\, and the electric polarizability\, depend only on the ratio of these tw
 o energies\, for which analytic expressions are obtained. We further inves
 tigate next-to-leading-order corrections arising from the neutron–neutro
 n effective range and evaluate their impact on these observables. Our resu
 lts establish a unified and systematically improvable EFT framework for de
 scribing the structure and electromagnetic response of two-neutron halo sy
 stems. \nLanguage: English\nReference\n[1] M. Hongo\, D. T. Son\, Phys. R
 ev. Lett. 128\, 212501 (2022)\, https://doi.org/10.1103/PhysRevLett.128.21
 2501\n[2] D. B. Costa\, M. Hongo\, D. T. Son\, Phys. Rev. C 112\, 014001 (
 2025)\, https://doi.org/10.1103/lds3-g3tp\n\nhttps://indico2.riken.jp/even
 t/5383/
LOCATION:RIBF Hall\, 2 Floor\, RIBF bldg. (Wako Saitama)
URL:https://indico2.riken.jp/event/5383/
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