Spectroscopy of the neutron-rich hypernucleus ${}_{\Lambda }^7$He from electron scattering

Abstract

The missing mass spectroscopy of the ${}_{\Lambda }^7$He hypernucleus was performed, using the ${}^7$Li$(e,e^{\prime }{K}^{+}{)}_{\Lambda }^7$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.

arXiv comment6 pages, 4 figures

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Cited by in corpus (14)

• Strangeness in nuclear physics
• On the Binding Energy and the Charge Symmetry Breaking in A<=16 Lambda-hypernuclei
• Similarity renormalization group evolution of hypernuclear Hamiltonians
• Ab initio calculation of charge symmetry breaking in $A=7$ and $8$ $\Lambda$-hypernuclei
• The cross-section measurement for the ${}^3\text{H}(e,e^{\prime }{K}^{+})nn\Lambda$ reaction
• Spectroscopy of $A=9$ hyperlithium by the $(e,e^{\prime }{K}^{+})$ reaction
• Experimental techniques and performance of $\Lambda$-hypernuclear spectroscopy with the $(e,e^{\prime }{K}^{+})$ reaction
• Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications
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• $p$-shell hypernuclear structures using the Gogny-interaction shell model
• Charge symmetry breaking in $\Lambda$ hypernuclei: updated HYP 2015 progress report
• Old and New in Strangeness Nuclear Physics