The observed pion momentum line at 113.8 MeV/c is reinterpreted as coming from ground-state Lambda-7He decay to the 478 keV excited state of Li-7 rather than from Lambda-3H decay.
Precise measurement of the $\Lambda$-binding energy difference between $^3_\Lambda$H and $^4_\Lambda$H via decay-pion spectroscopy at MAMI
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abstract
We performed high-precision decay-pion spectroscopy of light $\Lambda$ hypernuclei at the Mainz Microtron (MAMI) using the A1 spectrometer facility. By measuring the monochromatic $\pi^-$ momentum from the two-body weak decay $^3_\Lambda\mathrm{H} \to {}^3\mathrm{He} + \pi^-$ and referencing it to the $^4_\Lambda\mathrm{H} \to {}^4\mathrm{He} + \pi^-$ decay, we determined the $\Lambda$ binding energy of $^3_\Lambda\mathrm{H}$ with unprecedented accuracy. The obtained value, $B_\Lambda(^3_\Lambda\mathrm{H}) = 0.523 \pm 0.013~(\mathrm{stat.}) \pm 0.075~(\mathrm{syst.})$~MeV, is consistent with the STAR result, but indicates a significantly deeper binding than inferred from earlier measurements. This result implies a stronger $\Lambda$-deuteron interaction and provides stringent constraints on hyperon-nucleon interactions.
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nucl-th 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
The ^3He(K^-, pi^0) to ^4He reaction ratio constrains the Lambda binding energy in ^3_Lambda H to 0.05-0.15 MeV because the weakly bound state has an extended wave function.
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Questioning MAMI's recent determination of $B_{\Lambda}({_{\Lambda}^3}{\rm H})$
The observed pion momentum line at 113.8 MeV/c is reinterpreted as coming from ground-state Lambda-7He decay to the 478 keV excited state of Li-7 rather than from Lambda-3H decay.
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Sensitivity of the $^{3,4}$He($K^-$, $\pi^0$) production ratio to the $\Lambda$ binding energy of $^3_\Lambda$H
The ^3He(K^-, pi^0) to ^4He reaction ratio constrains the Lambda binding energy in ^3_Lambda H to 0.05-0.15 MeV because the weakly bound state has an extended wave function.