S. N. Nakamura, A. Matsumura, Y. Okayasu, T. Seva, V. M. Rodriguez, P. Baturin, L. Yuan, A. Acha, A. Ahmidouch, D. Androic, A. Asaturyan, R. Asaturyan, O. K. Baker, F. Benmokhtar, W. Boeglin, 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, L. Kramer, 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, B. Raue, J. Reinhold, R. Rivera, 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
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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http://arxiv.org/abs/1207.0571
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