The soft dipole resonances and E1 responses of 6He and 6Be

IF 2.6 3区物理与天体物理 Q2 PHYSICS, NUCLEAR

The European Physical Journal A Pub Date : 2025-04-01 DOI:10.1140/epja/s10050-025-01543-3

Y. H. Yang, Y. G. Ma, Z. C. Xu, S. M. Wang

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Abstract

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 (\(J^\pi = 1^-\)) had rarely been predicted before. In this work, we will investigate the presence of \(1^-\) 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 \(0^+\) ground-state of both nuclei. Additionally, we observed a significant enhancement in E1 transition strengths at the energy corresponding to the \(1^-\) state. This indicates the presence of relative motion between the valence nucleons and the core.

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来源期刊

The European Physical Journal A 物理-物理：核物理

CiteScore

5.00

自引率

18.50%

发文量

216

审稿时长

3-8 weeks

期刊介绍： Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.