<p>High-precision spectroscopy of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\Lambda $</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Λ</mi> </math></EquationSource> </InlineEquation> hypernuclei provides essential information on the <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\Lambda N$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Λ</mi> <mi>N</mi> </mrow> </math></EquationSource> </InlineEquation> interaction and on the structure of strange nuclear many-body systems. It is also closely related to current topics in few-body physics and nuclear astrophysics, including charge-symmetry breaking in <InlineEquation ID="IEq5"> <EquationSource Format="TEX">$\Lambda $</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Λ</mi> </math></EquationSource> </InlineEquation> hypernuclei, the hypertriton puzzle, possible neutron-rich light hypernuclear systems, and the hyperon puzzle in neutron stars. In this article, I review ongoing and planned spectroscopic studies of <InlineEquation ID="IEq6"> <EquationSource Format="TEX">$\Lambda $</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Λ</mi> </math></EquationSource> </InlineEquation> hypernuclei with complementary probes at JLab, MAMI, and J-PARC. Electron-induced reactions such as <InlineEquation ID="IEq7"> <EquationSource Format="TEX">$(e,e'K^+)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>e</mi> <mo>,</mo> <msup> <mi>e</mi> <mo>′</mo> </msup> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> offer excellent absolute energy calibration and high-resolution spectroscopy for light-to-heavy hypernuclei. Decay-pion spectroscopy of electroproduced hypernuclei provides a powerful method for precise binding-energy studies of light systems, particularly the hypertriton. At J-PARC, the planned High-Intensity, High-Resolution beamline will enable high-intensity, high-resolution <InlineEquation ID="IEq8"> <EquationSource Format="TEX">$(\pi ^+,K^+)$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <msup> <mi>π</mi> <mo>+</mo> </msup> <mo>,</mo> <msup> <mi>K</mi> <mo>+</mo> </msup> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> spectroscopy over a wide mass range and open a path toward a hypernuclear factory. The complementarity of these approaches will play a key role in establishing a comprehensive and precise picture of <InlineEquation ID="IEq9"> <EquationSource Format="TEX">$\Lambda $</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Λ</mi> </math></EquationSource> </InlineEquation> hypernuclear structure from few-body systems to heavy hypernuclei.</p>

High-precision spectroscopy of $\Lambda $ hypernuclei with electron and meson beams

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2026年4月14日

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Satoshi N. Nakamura

摘要

High-precision spectroscopy of $\Lambda $ $Λ$ hypernuclei provides essential information on the $\Lambda N$ $Λ N$ interaction and on the structure of strange nuclear many-body systems. It is also closely related to current topics in few-body physics and nuclear astrophysics, including charge-symmetry breaking in $\Lambda $ $Λ$ hypernuclei, the hypertriton puzzle, possible neutron-rich light hypernuclear systems, and the hyperon puzzle in neutron stars. In this article, I review ongoing and planned spectroscopic studies of $\Lambda $ $Λ$ hypernuclei with complementary probes at JLab, MAMI, and J-PARC. Electron-induced reactions such as $(e,e'K^+)$ $(e, e^{'} K^{+})$ offer excellent absolute energy calibration and high-resolution spectroscopy for light-to-heavy hypernuclei. Decay-pion spectroscopy of electroproduced hypernuclei provides a powerful method for precise binding-energy studies of light systems, particularly the hypertriton. At J-PARC, the planned High-Intensity, High-Resolution beamline will enable high-intensity, high-resolution $(\pi ^+,K^+)$ $(π^{+}, K^{+})$ spectroscopy over a wide mass range and open a path toward a hypernuclear factory. The complementarity of these approaches will play a key role in establishing a comprehensive and precise picture of $\Lambda $ $Λ$ hypernuclear structure from few-body systems to heavy hypernuclei.

High-precision spectroscopy of \(\Lambda \) hypernuclei with electron and meson beams

摘要