Published March 2022 | Version v1
Journal article Metadata-only

Study of the nnΛ State and Λn Interaction at Jefferson Lab

Creators

  • 1. Graduate School of Science Tohoku University, 6-3 Aoba-ku, Sendai, Miyagi, 9820-8578 (Japan)
  • 2. Tohoku Medical and Pharmaceutical University, Sendai, Miyagi, 981-8558 (Japan)
  • 3. I.N.F.N. Sezione di Roma, Gr. Coll. Santita', Viale Regina Elena 299, Rome (Italy)
  • 4. Department of Physics, Kyoto University, Kyoto, 606-8502 (Japan)
  • 5. Department of Physics, Florida International University, Miami, FL, 27411 (United States)
  • 6. Department of Physics, Hampton University, Hampton, VA, 23668 (United States)

Description

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 Λn 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,e′K+) 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,e′K+)Λ/Σ0 reactions gave the mass resolution of the Λ and Σ0 each 3.5 MeV/c2 FWHM, for the elementary reaction. A spectrum of 3H(e,e′K+)X was obtained, and a simple model with a Λn final state interaction was applied to reproduce the spectrum. (author)

Additional details

Identifiers

DOI
10.1007/s00601-021-01717-x;

Publishing Information

Journal Title
Few-Body Systems
Journal Volume
63
Journal Issue
1
Journal Page Range
p. 16
ISSN
0177-7963
CODEN
FBSYEQ

INIS

Country of Publication
Austria
Country of Input or Organization
Austria
INIS RN
53084823
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S97: MATHEMATICAL METHODS AND COMPUTING;
Descriptors DEI
BOUND STATE; CALIBRATION; CEBAF ACCELERATOR; ENERGY LEVELS; FINAL-STATE INTERACTIONS; HYDROGEN; KAONS PLUS; LAMBDA PARTICLES; MASS; MASS RESOLUTION; MEV RANGE 01-10; NEUTRONS; SCATTERING; SENSITIVITY; SIGMA NEUTRAL PARTICLES; SPECTRA; TRITIUM
Descriptors DEC
ACCELERATORS; BARYONS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BOSONS; ELEMENTARY PARTICLES; ELEMENTS; ENERGY RANGE; FERMIONS; HADRONS; HYDROGEN ISOTOPES; HYPERONS; INTERACTIONS; ISOTOPES; KAONS; LAMBDA BARYONS; LIGHT NUCLEI; LINEAR ACCELERATORS; MESONS; MEV RANGE; NONMETALS; NUCLEI; NUCLEONS; ODD-EVEN NUCLEI; PSEUDOSCALAR MESONS; RADIOISOTOPES; RESOLUTION; SIGMA BARYONS; SIGMA PARTICLES; STRANGE MESONS; STRANGE PARTICLES; YEARS LIVING RADIOISOTOPES