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. 2013 Jan 4;110(1):012502.
doi: 10.1103/PhysRevLett.110.012502. Epub 2013 Jan 2.

Observation of the (Λ)(7)He hypernucleus by the (e, e'K+) reaction

S N Nakamura  1 , 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, 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
Affiliations

Observation of the (Λ)(7)He hypernucleus by the (e, e'K+) reaction

S N Nakamura et al. Phys Rev Lett. .

Abstract

An experiment with a newly developed high-resolution kaon spectrometer and a scattered electron spectrometer with a novel configuration was performed in Hall C at Jefferson Lab. The ground state of a neutron-rich hypernucleus, (Λ)(7)He, 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 (Λ)(7)He binding energy supplies the last missing information of the A = 7, T = 1 hypernuclear isotriplet, providing a new input for the charge symmetry breaking effect of the ΛN potential.

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