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• W4313265404 abstract "The ${ensuremath{pi}}^{ensuremath{-}}+^{2}mathrm{H}ensuremath{rightarrow}n+n, {ensuremath{pi}}^{ensuremath{-}}+^{3}mathrm{H}ensuremath{rightarrow}n+n+n, {ensuremath{pi}}^{ensuremath{-}}+^{3}mathrm{He}ensuremath{rightarrow}n+d$, and ${ensuremath{pi}}^{ensuremath{-}}+^{3}mathrm{He}ensuremath{rightarrow}p+n+n$ capture reactions from the lowest $1S$ atomic orbitals are studied under full inclusion of final state interactions. Our results are obtained with the single-nucleon and two-nucleon transition operators derived at leading order in chiral effective field theory. The initial and final three-nucleon states are calculated with the chiral nucleon-nucleon semilocal momentum space potential up to ${mathrm{N}}^{4}{mathrm{LO}}^{+}$, augmented by the consistently regularized chiral ${mathrm{N}}^{2}mathrm{LO}$ three-nucleon potential. We found that absorption rates depend strongly on the nuclear pion absorption operator used, and its two-body parts change the rates by a few orders of magnitude. The final state interactions between nucleons generated by the two-nucleon forces are also important, while the three-nucleon interaction plays a visible role only in the ${ensuremath{pi}}^{ensuremath{-}}+^{3}mathrm{He}ensuremath{rightarrow}n+d$ reaction. Our absorption rate for the ${ensuremath{pi}}^{ensuremath{-}}+^{2}mathrm{H}ensuremath{rightarrow}n+n$ process is in good agreement with the experimental data from the hadronic ground-state broadening in pionic deuterium. The capture rates on $^{3}mathrm{He}$ are also generally consistent with the spectroscopic data within error bars, though our central values are found to be systematically below the data. We show that for the three-body breakup processes the dominant contributions to the absorption rates arise from the quasi-free scattering and final-state interaction kinematical configurations." @default.
• W4313265404 created "2023-01-06" @default.
• W4313265404 creator A5001916152 @default.
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• W4313265404 creator A5056028762 @default.
• W4313265404 creator A5058539517 @default.
• W4313265404 creator A5062083976 @default.
• W4313265404 creator A5062558272 @default.
• W4313265404 creator A5081413104 @default.
• W4313265404 date "2022-12-19" @default.
• W4313265404 modified "2023-10-16" @default.
• W4313265404 title "Pion absorption from the lowest atomic orbital in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mmultiscripts><mml:mi mathvariant=normal>H</mml:mi><mml:mprescripts /><mml:none /><mml:mn>2</mml:mn></mml:mmultiscripts></mml:mrow><mml:mo>,</mml:mo><mml:mo> </mml:mo><mml:mrow><mml:mmultiscripts><mml:mi mathvariant=normal>H</mml:mi><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> , and <mml:math xmlns:mml=http://www.w3.org/…" @default.
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