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Title: Spectroscopy of the neutron-rich hypernucleus HeΛ7 from electron scattering

Here, the missing mass spectroscopy of the $$^{7}_{\Lambda}$$He hypernucleus was performed, using the $$^{7}$$Li$$(e,e^{\prime}K^{+})^{7}_{\Lambda}$$He reaction at the Thomas Jefferson National Accelerator Facility Hall C. The $$\Lambda$$ binding energy of the ground state (1/2$$^{+}$$) was determined with a smaller error than that of the previous measurement, being $$B_{\Lambda}$$ = 5.55 $$\pm$$ 0.10(stat.) $$\pm$$ 0.11(sys.) MeV. The experiment also provided new insight into charge symmetry breaking in p-shell hypernuclear systems. Finally, a peak at $$B_{\Lambda}$$ = 3.65 $$\pm$$ 0.20(stat.) $$\pm$$ 0.11(sys.) MeV was observed and assigned as a mixture of 3/2$$^{+}$$ and 5/2$$^{+}$$ states, confirming the "gluelike" behavior of $$\Lambda$$, which makes an unstable state in $$^{6}$$He stable against neutron emission.
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Publication Date:
OSTI Identifier:
1294183
Report Number(s):
JLAB-PHY--16-2306; DOE/OR/23177--3893; arXiv:1606.09157
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
12002001; 15684005; 16GS0201; 24.4123; AC05-84ER40150; AC05-06OR23177; FG02-99ER41065; FG02-97ER41047; AC02-06CH11357; FG02-00ER41110; AC02-98CH10886; 013815; 0758095
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
HKS (JLab E05-115) Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS