Spectroscopy of the neutron-rich hypernucleus HeΛ7 from electron scattering

Gogami, T. and Androić, Darko and Furić, Miroslav and Petković, Tomislav and Ševa, Tomislav and Zhu, L. (HKS(JLab E05-115) Collaboration) (2016) Spectroscopy of the neutron-rich hypernucleus HeΛ7 from electron scattering. Physical Review C, 94 (2). 21302R-6. ISSN 2469-9985

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Abstract

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.

Item Type: Article
Keywords: hypernuclei spectroscopy, Lambda electroproduction, hypernucleus 7He-Lambda, Lambda - binding energy, ground-state mixture, charge symmetry breaking, JLab
Date: 12 August 2016
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2016 American Physical Society. Received 29 June 2016; published 12 August 2016.
Divisions: Faculty of Science > Department of Physics
Project code: 0036056
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 12 Sep 2016 10:59
Last Modified: 29 Nov 2017 16:42
URI: http://digre.pmf.unizg.hr/id/eprint/5045

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