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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.
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Submitted on : Wednesday, May 28, 2014 - 2:34:51 PM
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G. M. Urciuoli, F. Cusanno, S. Marrone, A. Acha, P. Ambrozewicz, et al.. Spectroscopy of Lambda-9Li by electroproduction. Physical Review C, American Physical Society, 2015, 91, pp.034308. ⟨10.1103/PhysRevC.91.034308⟩. ⟨in2p3-00997473⟩



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