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Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction

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arxiv 1207.0571 v4 pith:OLSIFI4S submitted 2012-07-03 nucl-ex

S. N. Nakamura , A. Matsumura , Y. Okayasu , T. Seva , V. M. Rodriguez , P. Baturin , L. Yuan , A. Acha
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A. Ahmidouch D. Androic A. Asaturyan R. Asaturyan O. K. Baker F. Benmokhtar P. Bosted R. Carlini C. Chen M. Christy L. Cole S. Danagoulian A. Daniel V. Dharmawardane K. Egiyan M. Elaasar R. Ent H. Fenker Y. Fujii M. Furic L. Gan D. Gaskell A. Gasparian E. F. Gibson T. Gogami P. Gueye Y. Han O. Hashimoto E. Hiyama D. Honda T. Horn B. Hu Ed V. Hungerford C. Jayalath M. Jones K. Johnston N. Kalantarians H. Kanda M. Kaneta F. Kato S. Kato D. Kawama C. Keppel K. J. Lan W. Luo D. Mack K. Maeda S. Malace A. Margaryan G. Marikyan P. Markowitz T. Maruta N. Maruyama T. Miyoshi A. Mkrtchyan H. Mkrtchyan S. Nagao T. Navasardyan G. Niculescu M.-I. Niculescu H. Nomura K. Nonaka A. Ohtani M. Oyamada N. Perez T. Petkovic S. Randeniya J. Reinhold J. Roche Y. Sato E. K. Segbefia N. Simicevic G. Smith Y. Song M. Sumihama V. Tadevosyan T. Takahashi L. Tang K. Tsukada V. Tvaskis W. Vulcan S. Wells S. A. Wood C. Yan S. Zhamkochyan (HKS (JLab E01-011) Collaboration)
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An experiment with a newly developed high-resolution kaon spectrometer (HKS) and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of a neutron-rich hypernucleus, He 7 Lambda, was observed for the first time with the (e,e'K+) reaction with an energy resolution of ~0.6 MeV. This resolution is the best reported to date for hypernuclear reaction spectroscopy. The he 7 Lambda binding energy supplies the last missing information of the A=7, T=1 hypernuclear iso-triplet, providing a new input for the charge symmetry breaking (CSB) effect of \Lambda N potential.

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  1. Perspectives for hyperon and hypernuclei physics

    nucl-th 2025-06 unverdicted novelty 2.0 of 10

    Hypernuclei are reviewed as key probes of the strong interaction, with upcoming experiments and higher-order theory expected to resolve the hypertriton binding energy and charge symmetry puzzles.

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