• Letter

Modeling the electric dipole strength of neutron-rich He8: Prediction of multineutron collective excitations

Takayuki Myo and Kiyoshi Katō
Phys. Rev. C 106, L021302 – Published 2 August 2022

Abstract

We investigate the multineutron excitations of neutron-rich He8 in the electric dipole strength using a He4+n+n+n+n five-body model. Many-body unbound states of He8 are obtained in the complex scaling method. We found that the different excitation modes coexist in the dipole strength below the excitation energy of 20 MeV. The strength below 10 MeV comes from the He7+n channel, indicating the sequential breakup of He8 via the He7 resonance to He6+n+n. Above 10 MeV, the strength is obtained from many-body continuum states with strong configuration mixings, suggesting a new collective motion of four neutrons with the dipole oscillation against He4.

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  • Received 30 May 2022
  • Accepted 22 July 2022

DOI:https://doi.org/10.1103/PhysRevC.106.L021302

©2022 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsNuclear Physics

Authors & Affiliations

Takayuki Myo1,2,* and Kiyoshi Katō3,†

  • 1General Education, Faculty of Engineering, Osaka Institute of Technology, Osaka, Osaka 535-8585, Japan
  • 2Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan
  • 3Nuclear Reaction Data Centre, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan

  • *takayuki.myo@oit.ac.jp
  • kato@nucl.sci.hokudai.ac.jp

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Issue

Vol. 106, Iss. 2 — August 2022

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