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Spectroscopic study of a possible Λnn resonance and a pair of ΣNN states using the (e,e′K+) reaction with a tritium target

B. Pandey1, L. Tang1,2,*, T. Gogami3,4, K. N. Suzuki4, K. Itabashi3, S. Nagao3, K. Okuyama3, S. N. Nakamura3, D. Abrams5 et al. (Hall A Collaboration)

D. Abrams5, I. R. Afnan6, T. Akiyama3, D. Androic7, K. Aniol8, T. Averett9, C. Ayerbe Gayoso9, J. Bane10, S. Barcus9, J. Barrow10, V. Bellini11, H. Bhatt12, D. Bhetuwal12, D. Biswas1, A. Camsonne2, J. Castellanos13, J-P. Chen2, J. Chen9, S. Covrig2, D. Chrisman14,15, R. Cruz-Torres16, R. Das17, E. Fuchey18, C. Gal5, B. F. Gibson19, K. Gnanvo5, F. Garibaldi11,20, T. Gautam1, J. Gomez2, P. Gueye1, T. J. Hague21, O. Hansen2, W. Henry2, F. Hauenstein22, D. W. Higinbotham2, C. Hyde22, M. Kaneta3, C. Keppel2, T. Kutz17, N. Lashley-Colthirst1, S. Li23,24, H. Liu25, J. Mammei26, P. Markowitz13, R. E. McClellan2, F. Meddi11, D. Meekins2, R. Michaels2, M. Mihovilovič27,28,29, A. Moyer30, D. Nguyen16,31, M. Nycz21, V. Owen9, C. Palatchi5, S. Park17, T. Petkovic7, S. Premathilake5, P. E. Reimer32, J. Reinhold13, S. Riordan32, V. Rodriguez33, C. Samanta34, S. N. Santiesteban23, B. Sawatzky2, S. Širca27,28, K. Slifer23, T. Su21, Y. Tian35, Y. Toyama3, K. Uehara3, G. M. Urciuoli11, D. Votaw14,15, J. Williamson36, B. Wojtsekhowski2, S. Wood2, B. Yale23, Z. Ye32, J. Zhang5, and X. Zheng5 (Hall A Collaboration)

  • 1Department of Physics, Hampton University, Virginia 23668, USA
  • 2Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 3Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
  • 4Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • 5Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA
  • 6School of Chemical and Physical Science, Flinders University, GPO Box 2100, Adelaide 5001, Australia
  • 7Department of Physics & Department of Applied Physics, University of Zagreb, HR-10000 Zagreb, Croatia
  • 8Physics and Astronomy Department, California State University, Los Angeles, California 90032, USA
  • 9Department of Physics, The College of William and Mary, Virginia 23185, USA
  • 10Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 11INFN, Sezione di Roma, 00185 Rome, Italy
  • 12Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762, USA
  • 13Department of Physics, Florida International University, Miami, Florida 33199, USA
  • 14Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 15National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
  • 16Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 17Department of Physics, State University of New York, Stony Brook, New York 11794, USA
  • 18Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
  • 19Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 20Istituto Superiore di Sanità, 00161 Rome, Italy
  • 21Department of Physics, Kent State University, Kent, Ohio 44242, USA
  • 22Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA
  • 23Department of Physics, University of New Hampshire, Durham, New Hampshire 03824, USA
  • 24Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 25Department of Physics, Columbia University, New York, New York 10027, USA
  • 26Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
  • 27Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
  • 28Jožef Stefan Institute, Ljubljana, Slovenia
  • 29Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, DE-55128 Mainz, Germany
  • 30Department of Physics, Christopher Newport University, Newport News, Virginia 23606, USA
  • 31University of Education, Hue University, Hue City, Vietnam
  • 32Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 33División de Ciencias y Tecnologia, Universidad Ana G. Méndez, Recinto de Cupey, San Juan 00926, Puerto Rico
  • 34Department of Physics & Astronomy, Virginia Military Institute, Lexington, Virginia 24450, USA
  • 35Department of Physics, Syracuse University, New York, New York 10016, USA
  • 36School of Physics & Astronomy, University of Glasgow, Glasgow, G12 8QQ Scotland, United Kingdom

  • *Corresponding author: tangl@jlab.org

Phys. Rev. C 105, L051001 – Published 20 May, 2022

DOI: https://doi.org/10.1103/PhysRevC.105.L051001

Abstract

A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and a tritium target was performed in Hall A at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to a possible Λnn resonance and a pair of ΣNN states, were observed with an energy resolution of about 1.21 MeV (σ), although greater statistics are needed to make definitive identifications. An experimentally measured Λnn state may provide a unique constraint in determining the Λn interaction, for which no scattering data exist. In addition, although bound A=3 and 4 Σ hypernuclei have been predicted, only an A=4 Σ hypernucleus (HeΣ4) was found, utilizing the (K−,π−) reaction on a He4 target. The possible bound ΣNN state is likely a Σ0nn state, although this has to be confirmed by future experiments.

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