Cross-section measurement of virtual photoproduction of iso-triplet three-body hypernucleus, Λnn

¹ Graduate School of Science, Kyoto University, Kyoto 606-8502 Japan
² Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
³ Department of Physics, Hampton University, Virginia 23668, USA
⁴ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
⁵ Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
⁶ Department of Physics & Department of Applied Physics, University of Zagreb, HR-10000 Zagreb, Croatia
⁷ Physics and Astronomy Department, California State University, Los Angeles, California 90032, USA
⁸ Department of Physics, The College of William and Mary, Virginia 23185, USA
⁹ Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA
¹⁰ INFN, Sezione di Roma, 00185, Rome, Italy
¹¹ Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762, USA
¹² Department of Physics, Florida International University, Miami, Florida 33199, USA
¹³ Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
¹⁴ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
¹⁵ Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
¹⁶ Department of Physics, State University of New York, Stony Brook, New York 11794, USA
¹⁷ Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
¹⁸ Istituto Superiore di Sanità, 00161, Rome, Italy
¹⁹ Department of Physics, Kent State University, Kent, Ohio 44242, USA
²⁰ Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA
²¹ Department of Physics, University of New Hampshire, Durham, New Hampshire 03824, USA
²² Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
²³ Department of Physics, Columbia University, New York, New York 10027, USA
²⁴ Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
²⁵ Sapienza University of Rome, I-00185, Rome, Italy
²⁶ Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
²⁷ Jožef Stefan Institute, Ljubljana, Slovenia
²⁸ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, DE-55128 Mainz, Germany
²⁹ Department of Physics, Christopher Newport University, Newport News, Virginia 23606, USA
³⁰ University of Education, Hue University, Hue City, Vietnam
³¹ Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
³² División de Ciencias y Tecnologia, Universidad Ana G. Méndez, Recinto de Cupey, San Juan 00926, Puerto Rico
³³ Department of Physics & Astronomy, Virginia Military Institute, Lexington, Virginia 24450, USA
³⁴ Department of Physics, Syracuse University, New York, New York 10016, USA
³⁵ School of Physics & Astronomy, University of Glasgow, Glasgow, G12 8QQ, Scotland, UK

^* e-mail: gogami@jlab.org

Published online: 9 November 2022

Abstract

Missing-mass spectroscopy with the ³H(e, e′K⁺) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the ³H(γ^∗, K⁺)Λnn was deduced at ω = Ee − E_e′ = 2.102 GeV and at the forward K⁺-scattering angle (0^° ≤ θ_γ∗K ≤ 5^°) in the laboratory frame. Given typical predicted energies and decay widths, which are (B_Λ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)^+4.1_−2.1(sys.) and 18.1 ± 6.8(stat.)^+4.2_−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations.