Spectroscopy of the neutron-rich hypernucleus He Λ7 from electron scattering

T. Gogami, C. Chen, D. Kawama, P. Achenbach, A. Ahmidouch, I. Albayrak, D. Androic, A. Asaturyan, R. Asaturyan, O. Ates, P. Baturin, R. Badui, W. Boeglin, J. Bono, E. Brash, P. Carter, A. Chiba, E. Christy, S. Danagoulian, R. De LeoD. Doi, M. Elaasar, R. Ent, Y. Fujii, M. Fujita, M. Furic, M. Gabrielyan, L. Gan, F. Garibaldi, D. Gaskell, A. Gasparian, Y. Han, O. Hashimoto, T. Horn, B. Hu, Ed V. Hungerford, M. Jones, H. Kanda, M. Kaneta, S. Kato, M. Kawai, H. Khanal, M. Kohl, A. Liyanage, W. Luo, K. Maeda, A. Margaryan, P. Markowitz, T. Maruta, A. Matsumura, HKS (JLab E05-115) Collaboration

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The missing mass spectroscopy of the HeΛ7 hypernucleus was performed using the Li7(e,e′K+)HeΛ7 reaction at the Thomas Jefferson National Accelerator Facility Hall C. The Λ-binding energy of the ground-state (1/2+) was determined with a smaller error than that of the previous measurement, being BΛ=5.55±0.10stat.±0.11sys.MeV. The experiment also provided new insight into charge symmetry breaking in p-shell hypernuclear systems. Finally, a peak at BΛ=3.65±0.20stat.±0.11sys.MeV was observed and assigned as a mixture of 3/2+ and 5/2+ states, confirming the "gluelike" behavior of Λ, which makes an unstable state in He6 stable against neutron emission.

Original languageEnglish (US)
Article number021302
JournalPhysical Review C
Issue number2
StatePublished - Aug 12 2016

Bibliographical note

Funding Information:
The program at JLab Hall C is supported by JSPS KAKENHI Grants No. 12002001, No. 15684005, No. 16GS0201, and No. 24.4123 (Grant-in-Aid for JSPS fellow), JSPS Core-to-Core Program No. 21002, and JSPS Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation No. R2201. This work was supported by U.S. Department of Energy Contracts No. DE-AC05-84ER40150, No. DE-AC05-06OR23177, No. DE-FG02-99ER41065, No. DE-FG02-97ER41047, No. DE-AC02-06CH11357, No. DE-FG02-00ER41110, and No. DE-AC02-98CH10886, and U.S.-NSF Contracts No. 013815 and No. 0758095.

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