https://doi.org/10.1140/epja/s10050-025-01543-3
Regular Article - Theoretical Physics
The soft dipole resonances and E1 responses of 6He and 6Be
1
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800, Shanghai, China
2
University of Chinese Academy of Sciences, 100049, Beijing, China
3
Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, 200433, Fudan University, China
4
Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, 200438, Shanghai, China
a
mayugang@fudan.edu.cn
b
xuzhicheng@fudan.edu.cn
c
wangsimin@fudan.edu.cn
Received:
6
September
2024
Accepted:
14
March
2025
Published online:
1
April
2025
6He, known as a Borromean nucleus with a 2n-halo structure, and its mirror partner 6Be, the lightest 2p emitter, provide an excellent framework for exploring soft dipole resonance and nuclear structure. Despite previous studies on these nuclei, the potential presence of soft dipole resonance (
) had rarely been predicted before. In this work, we will investigate the presence of 
resonance states in the complex energy plane, focusing on how the soft dipole resonance impacts the E1 transitions/response. Using the Gamow coupled-channel method for three-body calculations, we analyze the structures and soft dipole resonance of 6He and 6Be mirror systems, further exploring the E1 transition strengths of 6He through Green’s function method. The results show that the structural properties of 6He and 6Be show similar behavior. Notably, there are significant di-nucleon correlations in the 
ground-state of both nuclei. Additionally, we observed a significant enhancement in E1 transition strengths at the energy corresponding to the state. This indicates the presence of relative motion between the valence nucleons and the core.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
