Study of the nnΛ State and Λ n Interaction at Jefferson Lab

for the JLab Hypernuclear Collaboration

Research output: Contribution to journalArticlepeer-review


An nnΛ , which consists of two neutrons and a Lambda hyperon, is a multi-baryon system with no charge. Studying the nnΛ state would provide information about the Λ n interaction which has not been directly measured by a scattering experiment. The experiment (E12-17-003) was performed in order to search for the nnΛ state at Jefferson Lab. The nnΛ is expected to be produced by the (e, eK+) reaction, which has sensitivity to both bound and resonance states if the natural width of the nnΛ is narrow enough to be observed as a peak. The experiment used gas targets of hydrogen and tritium for mass calibration and the nnΛ production, respectively. The mass calibration with H (e, eK+) Λ / Σ reactions gave the mass resolution of the Λ and Σ each 3.5 MeV / c2 FWHM, for the elementary reaction. A spectrum of 3H (e, eK+) X was obtained, and a simple model with a Λ n final state interaction was applied to reproduce the spectrum.

Original languageEnglish
Article number16
JournalFew-Body Systems
Issue number1
Publication statusPublished - 2022 Mar

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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