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

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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classification ⚛️ nucl-ex

keywords lambdareactionenergyhypernuclearhypernucleusresolutionspectrometerbest

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

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