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<p>In this study, we investigate the neutron-rich even-even isotopic chains of <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(_{20}^{48}\)</EquationSource> </InlineEquation>Ca and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(_{28}^{56}\)</EquationSource> </InlineEquation>Ni, where nuclear structure has been extensively examined near the line of stability. Particular attention is given to the role of monopole interactions between the magic core and the valence neutrons. Spectroscopic calculations–covering excitation energies <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\((2^+, 4^+)\)</EquationSource> </InlineEquation> and electric transition probabilities <i>B</i>(<i>E</i>2)–are carried out using the NuShellX@MSU code. To enhance theoretical predictions, we modify the monopole neutron–neutron components of two well-established interactions: <i>ho</i> for the calcium region and <i>jj</i>44<i>pna</i> for the nickel region. These adjustments lead to new effective interactions, denoted <i>hom</i> and <i>jj</i>44<i>am</i>, respectively. The modified interactions show an agreement with experimental observations.</p>

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Comparative Study of Monopole Interaction Effects in even-even \(_{20}^{48}\)Ca and \(_{28}^{56}\)Ni Isotopic Chains

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Lamia Aissaoui,
  • Asma Ziri,
  • Soumia Benchia

摘要

In this study, we investigate the neutron-rich even-even isotopic chains of \(_{20}^{48}\) Ca and \(_{28}^{56}\) Ni, where nuclear structure has been extensively examined near the line of stability. Particular attention is given to the role of monopole interactions between the magic core and the valence neutrons. Spectroscopic calculations–covering excitation energies \((2^+, 4^+)\) and electric transition probabilities B(E2)–are carried out using the NuShellX@MSU code. To enhance theoretical predictions, we modify the monopole neutron–neutron components of two well-established interactions: ho for the calcium region and jj44pna for the nickel region. These adjustments lead to new effective interactions, denoted hom and jj44am, respectively. The modified interactions show an agreement with experimental observations.