dorsal/arxiv
View SchemaPrecise measurement of the $\Lambda$-binding energy difference between $^3_\Lambda$H and $^4_\Lambda$H via decay-pion spectroscopy at MAMI
| Authors | Ryoko Kino, Sho Nagao, Patrick Achenbach, Satoshi N. Nakamura, Josef Pochodzalla, Takeru Akiyama, Ralph Böhm, Mirco Christmann, Michael O. Distler, Luca Doria, Anselm Esser, Julian Geratz, Christian Helmel, Matthias Hoek, Tatsuhiro Ishige, Masashi Kaneta, Pascal Klag, David Markus, Harald Merkel, Masaya Mizuno, Ulrich Müller, Kotaro Nishi, Ken Nishida, Kazuki Okuyama, Jonas Pätschke, Björn Sören Schlimme, Concettina Sfienti, Tianhao Shao, Daniel Steger, Marcell Steinen, Liguang Tang, Michaela Thiel, Philipp Vonwirth, Luca Wilhelm |
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| Categories | |
| ArXiv ID | 2601.08694vv1 |
| URL | https://arxiv.org/abs/2601.08694 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
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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"date_created": "2026-02-17T05:53:16.128000Z",
"date_modified": "2026-02-17T05:53:16.128000Z",
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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.",
"arxiv_id": "2601.08694",
"authors": [
"Ryoko Kino",
"Sho Nagao",
"Patrick Achenbach",
"Satoshi N. Nakamura",
"Josef Pochodzalla",
"Takeru Akiyama",
"Ralph B\u00f6hm",
"Mirco Christmann",
"Michael O. Distler",
"Luca Doria",
"Anselm Esser",
"Julian Geratz",
"Christian Helmel",
"Matthias Hoek",
"Tatsuhiro Ishige",
"Masashi Kaneta",
"Pascal Klag",
"David Markus",
"Harald Merkel",
"Masaya Mizuno",
"Ulrich M\u00fcller",
"Kotaro Nishi",
"Ken Nishida",
"Kazuki Okuyama",
"Jonas P\u00e4tschke",
"Bj\u00f6rn S\u00f6ren Schlimme",
"Concettina Sfienti",
"Tianhao Shao",
"Daniel Steger",
"Marcell Steinen",
"Liguang Tang",
"Michaela Thiel",
"Philipp Vonwirth",
"Luca Wilhelm"
],
"categories": [
"nucl-ex"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Precise measurement of the $\\Lambda$-binding energy difference between $^3_\\Lambda$H and $^4_\\Lambda$H via decay-pion spectroscopy at MAMI",
"url": "https://arxiv.org/abs/2601.08694",
"version": "v1"
},
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"execution_id": "bb9ab437-0e91-4b6d-9bd7-1d012b33d198",
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"type": "Model",
"variant": "snapshot-2026-01-17",
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