Spectroscopy of Lambda-9Li by electroproduction

G. M. Urciuoli , F. Cusanno , S. Marrone , A. Acha , P. Ambrozewicz , K. A. Aniol , P. Baturin , P.Y. Bertin (1) , H. Benaoum , K. I. Blomqvist , W. U. Boeglin , H. Breuer , P. Brindza , P. Bydzovsky , A. Camsonne (1) , C. C. Chang , J. -P. Chen , Seonho Choi , E. A. Chudakov , E. Cisbani , S. Colilli , L. Coman , B. J. Craver , G. de Cataldo , C. W. de Jager , R. de Leo , A. P. Deur , C. Ferdi (1) , R. J. Feuerbach , E. Folts , R. Fratoni , S. Frullani , F. Garibaldi , O. Gayou , F. Giuliani , J. Gomez , M. Gricia , J. O. Hansen , D. Hayes , D. W. Higinbotham , T. K. Holmstrom , C. E. Hyde (1) , H. F. Ibrahim , M. Iodice , X. Jiang , L. J. Kaufman , K. Kino , B. Kross , L. Lagamba , J. J. Lerose , R. A. Lindgren , M. Lucentini , D. J. Margaziotis , P. Markowitz , Z. E. Meziani , K. Mccormick , R. W. Michaels , D. J. Millener , T. Miyoshi , B. Moffit , P. A. Monaghan , M. Moteabbed , C. Muñoz Camacho , S. Nanda , E. Nappi , V. V. Nelyubin , B. E. Norum , Y. Okasyasu , K. D. Paschke , C. F. Perdrisat , E. Piasetzky , V. A. Punjabi , Y. Qiang , P. E. Reimer , J. Reinhold , B. Reitz , R. E. Roche , V. M. Rodriguez , A. Saha , F. Santavenere , A. J. Sarty , J. Segal , A. Shahinyan , J. Singh , S. Sirca , R. Snyder , P. H. Solvignon , M. Sotona , R. Subedi , V. A. Sulkosky , T. Suzuki , H. Ueno , P. E. Ulmer , P. Veneroni , E. Voutier (2) , B. B. Wojtsekhowski , X. Zheng , C. Zorn

1 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
2 LPSC - Laboratoire de Physique Subatomique et de Cosmologie

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.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

G. M. Urciuoli, F. Cusanno, S. Marrone, A. Acha, P. Ambrozewicz, et al.. Spectroscopy of Lambda-9Li by electroproduction. Physical Review C, 2015, 91, pp.034308. ⟨10.1103/PhysRevC.91.034308⟩. ⟨in2p3-00997473⟩