Spectroscopy of Lambda-9Li by electroproduction

Abstract

In the absence of accurate data on the free two-body hyperon-nucleon interaction, the spectra of hypernuclei can provide information on the details of the effective hyperon-nucleon interaction. Electroproduction of the hypernucleus Lambda-9Li has been studied for the first time with sub-MeV energy resolution in Hall A at Jefferson Lab on a 9Be target. In order to increase the counting rate and to provide unambiguous kaon identification, two superconducting septum magnets and a Ring Imaging CHerenkov detector (RICH) were added to the Hall A standard equipment. The cross section to low-lying states of Lambda-9Li is concentrated within 3 MeV of the ground state and can be fitted with four peaks. The positions of the doublets agree with theory while a disagreement could exist with respect to the relative strengths of the peaks in the doublets. A Lambda separation energy of 8.36 +- 0.08 (stat.) +- 0.08 (syst.) MeV was measured, in agreement with an earlier experiment.

14 pages, 8 figures

References in corpus (9)

• Off-shell effects in the electromagnetic production of strangeness
• High resolution hypernuclear spectroscopy using the (e,e'K+) reaction
• Observation of the Helium 7 Lambda hypernucleus by the (e,e'K+) reaction
• High Resolution Spectroscopy of 12B_Lambda by Electroproduction
• High Resolution Spectroscopy of 16N_Lambda by Electroproduction
• Shell-model calculations for p-shell hypernuclei
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• Update of High Resolution (e,e'K^+) Hypernuclear Spectroscopy at Jefferson Lab's Hall A
• High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A

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