{"title":"The soft dipole resonances and E1 responses of 6He and 6Be","authors":"Y. H. Yang, Y. G. Ma, Z. C. Xu, S. M. Wang","doi":"10.1140/epja/s10050-025-01543-3","DOIUrl":null,"url":null,"abstract":"<div><p><sup>6</sup>He, known as a Borromean nucleus with a 2<i>n</i>-halo structure, and its mirror partner <sup>6</sup>Be, the lightest 2<i>p</i> 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 (<span>\\(J^\\pi = 1^-\\)</span>) had rarely been predicted before. In this work, we will investigate the presence of <span>\\(1^-\\)</span> resonance states in the complex energy plane, focusing on how the soft dipole resonance impacts the <i>E</i>1 transitions/response. Using the Gamow coupled-channel method for three-body calculations, we analyze the structures and soft dipole resonance of <sup>6</sup>He and <sup>6</sup>Be mirror systems, further exploring the <i>E</i>1 transition strengths of <sup>6</sup>He through Green’s function method. The results show that the structural properties of <sup>6</sup>He and <sup>6</sup>Be show similar behavior. Notably, there are significant di-nucleon correlations in the <span>\\(0^+\\)</span> ground-state of both nuclei. Additionally, we observed a significant enhancement in <i>E</i>1 transition strengths at the energy corresponding to the <span>\\(1^-\\)</span> state. This indicates the presence of relative motion between the valence nucleons and the core.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 4","pages":""},"PeriodicalIF":2.6000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"The European Physical Journal A","FirstCategoryId":"4","ListUrlMain":"https://link.springer.com/article/10.1140/epja/s10050-025-01543-3","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, NUCLEAR","Score":null,"Total":0}
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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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