Mirror-skin thickness: a possible observable sensitive to the charge symmetry breaking energy density functional.

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Title: Mirror-skin thickness: a possible observable sensitive to the charge symmetry breaking energy density functional.
Authors: Naito, Tomoya1,2 (AUTHOR) tnaito@ribf.riken.jp, Hijikata, Yuto3,4 (AUTHOR), Zenihiro, Juzo3,4 (AUTHOR), Colò, Gianluca5,6 (AUTHOR), Sagawa, Hiroyuki4,7 (AUTHOR)
Source: European Physical Journal A -- Hadrons & Nuclei. Jul2025, Vol. 61 Issue 7, p1-13. 13p.
Subjects: Density functionals, Symmetry breaking, Scientific observation, Ab-initio calculations, Hartree-Fock approximation, Isotopes
Abstract: We propose a new observable, named the mirror-skin thickness, in order to extract the strength of the charge symmetry breaking (CSB) term in an energy density functional (EDF). The mirror-skin thickness of N = 20 isotones and Z = 20 isotopes is studied by using Hartree-Fock-Bogoliubov (HFB) calculations with various Skyrme EDFs and adding CSB and charge independence breaking (CIB) terms. It is shown that the mirror-skin thickness is sensitive only to the CSB EDF, but hardly depends on either the isospin symmetric part of the nuclear EDF or the CIB term. Therefore, this observable can be used to extract the magnitude of the CSB term in the EDF quantitatively, either from experimental data or ab initio calculations. We have studied the accuracy in the mirror-skin thickness that is needed to extract sensible information. Our study may also help to understand the inconsistency between the strength of the phenomenological CSB and that extracted from ab initio calculations [Naito et al. Nuovo. Cim. C 47, 52 (2024)]. Among possible mirror pairs for experimental study, we propose the mirror-skin thickness between 42 Ca and 42 Ti , which could be accessed in future experiments in RIBF and/or FRIB. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Mirror-skin thickness: a possible observable sensitive to the charge symmetry breaking energy density functional.
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+A+--+Hadrons+%26+Nuclei%22">European Physical Journal A -- Hadrons & Nuclei</searchLink>. Jul2025, Vol. 61 Issue 7, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Density+functionals%22">Density functionals</searchLink><br /><searchLink fieldCode="DE" term="%22Symmetry+breaking%22">Symmetry breaking</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+observation%22">Scientific observation</searchLink><br /><searchLink fieldCode="DE" term="%22Ab-initio+calculations%22">Ab-initio calculations</searchLink><br /><searchLink fieldCode="DE" term="%22Hartree-Fock+approximation%22">Hartree-Fock approximation</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopes%22">Isotopes</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: We propose a new observable, named the mirror-skin thickness, in order to extract the strength of the charge symmetry breaking (CSB) term in an energy density functional (EDF). The mirror-skin thickness of N = 20 isotones and Z = 20 isotopes is studied by using Hartree-Fock-Bogoliubov (HFB) calculations with various Skyrme EDFs and adding CSB and charge independence breaking (CIB) terms. It is shown that the mirror-skin thickness is sensitive only to the CSB EDF, but hardly depends on either the isospin symmetric part of the nuclear EDF or the CIB term. Therefore, this observable can be used to extract the magnitude of the CSB term in the EDF quantitatively, either from experimental data or ab initio calculations. We have studied the accuracy in the mirror-skin thickness that is needed to extract sensible information. Our study may also help to understand the inconsistency between the strength of the phenomenological CSB and that extracted from ab initio calculations [Naito et al. Nuovo. Cim. C 47, 52 (2024)]. Among possible mirror pairs for experimental study, we propose the mirror-skin thickness between 42 Ca and 42 Ti , which could be accessed in future experiments in RIBF and/or FRIB. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1140/epja/s10050-025-01646-x
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      – Code: eng
        Text: English
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        PageCount: 13
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      – SubjectFull: Density functionals
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      – SubjectFull: Symmetry breaking
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      – SubjectFull: Scientific observation
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      – SubjectFull: Ab-initio calculations
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      – SubjectFull: Hartree-Fock approximation
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      – SubjectFull: Isotopes
        Type: general
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      – TitleFull: Mirror-skin thickness: a possible observable sensitive to the charge symmetry breaking energy density functional.
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            NameFull: Naito, Tomoya
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            NameFull: Zenihiro, Juzo
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            NameFull: Colò, Gianluca
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            – D: 01
              M: 07
              Text: Jul2025
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              Y: 2025
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