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Spectroscopy of Li-9(Lambda) by electroproduction
Urciuoli, G. M. Cusanno, F. Marrone, S. Holmstrom, T. K. Moffit, B. Perdrisat, C. F. Sulkosky, V. A.
Urciuoli, G. M.
Cusanno, F.
Marrone, S.
Holmstrom, T. K.
Moffit, B.
Perdrisat, C. F.
Sulkosky, V. A.
Abstract
Background: In the absence of accurate data on the free two-body hyperon-nucleon interaction, the spectra of hypernuclei provides information on the details of the effective hyperon-nucleon interaction. Purpose: To obtain a high-resolution binding-energy spectrum for the Be-9(e, e' K+) Li-9(Lambda) reaction. Method: Electroproduction of the hypernucleus Li-9(Lambda) has been studied for the first time with sub-MeV energy resolution in Hall A at Jefferson Lab on a Be-9 target. In order to increase the counting rate and to provide unambiguous kaon identification, two superconducting septum magnets and a ring imaging Cherenkov detector were added to the Hall A standard equipment. Results: The cross section to low-lying states of Li-9(Lambda) is concentrated within 3 MeV of the ground state and can be fit 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. The Lambda separation energy, B-Lambda, of 8.36 +/- 0.08 (stat.) +/- 0.08 (syst.) MeV was measured, in agreement with an earlier experiment.
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2015-01-01
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Physics
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https://doi.org/10.1103/PhysRevC.91.034308