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• W4384697161 abstract "Background: The four-neutron correlation has been attracting much attention for decades. In addition to the study on the tetraneutron system, it is worthwhile to investigate the correlation in bound systems.Purpose: The $^{8}mathrm{He}$ nucleus is a system where four neutrons are weakly bound around the $^{4}mathrm{He}$ core. The dineutron ($2n$) correlation has been long discussed in various weakly bound neutron-rich nuclei such as $^{6}mathrm{He}$ and $^{11}mathrm{Li}$, whereas the $^{8}mathrm{He}$ nucleus gives us an opportunity to investigate the $2ntext{ensuremath{-}}2n$ type four-neutron correlation.Methods: We introduce a microscopic $^{4}mathrm{He}+4n$ model and describe the ground-state structure of $^{8}mathrm{He}$. The mixing of the two-$2n$ component in the ground state is examined. The ground-state wave function is verified by investigating various observables including high-energy scattering cross sections.Results: Our model reasonably reproduces the available experimental data, the binding energy, charge radius, total reaction cross section, and proton-nucleus elastic scattering cross section data. We find that the significant mixing of the two-$2n$ cluster configurations around $^{4}mathrm{He}$ in the ground state of $^{8}mathrm{He}$: The ground state has a squared overlap of about 45% with a $2ntext{ensuremath{-}}^{4}mathrm{He}text{ensuremath{-}}2n$ configuration with the $^{4}mathrm{He}text{ensuremath{-}}2n$ distance of 3 fm and opening angle of ${80}^{ensuremath{circ}}$.Conclusions: The ground state of $^{8}mathrm{He}$ contains a certain amount of the two-$2n$ cluster component, indicating the strong nuclear deformation, which was experimentally observed recently." @default.
• W4384697161 created "2023-07-20" @default.
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• W4384697161 date "2023-07-18" @default.
• W4384697161 modified "2023-10-17" @default.
• W4384697161 title "Dineutron-dineutron correlation in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>8</mml:mn></mml:mmultiscripts></mml:math>" @default.
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• W4384697161 doi "https://doi.org/10.1103/physrevc.108.l011304" @default.
• W4384697161 hasPublicationYear "2023" @default.
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