Spectroscopy of <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mi>A</mi><mo>=</mo><mn>9</mn></mrow></math> hyperlithium with the <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><mo>(</mo><mi>e</mi><mo>,</mo><msup><mi>e</mi><mo>′</mo></msup><msup><mi>K</mi><mo>+</mo></msup><mo>)</mo></mrow></math> reaction

HKS (JLab E05-115) Collaboration; T. Gogami; C. Chen; D. Kawama; P. Achenbach; A. Ahmidouch; I. Albayrak; D. Androic; A. Asaturyan; R. Asaturyan; O. Ates; P. Baturin; R. Badui; W. Boeglin; J. Bono; E. Brash; P. Carter; A. Chiba; E. Christy; S. Danagoulian; R. De Leo; D. Doi; M. Elaasar; R. Ent; Y. Fujii; M. Fujita; M. Furic; M. Gabrielyan; L. Gan; F. Garibaldi; D. Gaskell; A. Gasparian; Y. Han; O. Hashimoto; T. Horn; B. Hu; Ed. V. Hungerford; M. Jones; H. Kanda; M. Kaneta; S. Kato; M. Kawai; H. Khanal; M. Kohl; A. Liyanage; W. Luo; K. Maeda; A. Margaryan; P. Markowitz; T. Maruta; A. Matsumura; V. Maxwell; D. Meekins; A. Mkrtchyan; H. Mkrtchyan; S. Nagao; S. N. Nakamura; A. Narayan; C. Neville; G. Niculescu; M. I. Niculescu; A. Nunez; Nuruzzaman; Y. Okayasu; T. Petkovic; J. Pochodzalla; X. Qiu; J. Reinhold; V. M. Rodriguez; C. Samanta; B. Sawatzky; T. Seva; A. Shichijo; V. Tadevosyan; L. Tang; N. Taniya; K. Tsukada; M. Veilleux; W. Vulcan; F. R. Wesselmann; S. A. Wood; T. Yamamoto; L. Ya; Z. Ye; K. Yokota; L. Yuan; S. Zhamkochyan; L. Zhu

doi:10.1103/PhysRevC.103.L041301

Letter

Spectroscopy of $A = 9$ hyperlithium with the $(e, e^{'} K^{+})$ reaction

T. Gogami^1,2, C. Chen³, D. Kawama², P. Achenbach⁴, A. Ahmidouch⁵, I. Albayrak³, D. Androic⁶, A. Asaturyan⁷, R. Asaturyan^7,* et al. (HKS (JLab E05-115) Collaboration)

R. Asaturyan^7,*, O. Ates³, P. Baturin⁸, R. Badui⁸, W. Boeglin⁸, J. Bono⁸, E. Brash⁹, P. Carter⁹, A. Chiba², E. Christy³, S. Danagoulian⁵, R. De Leo¹⁰, D. Doi², M. Elaasar¹¹, R. Ent¹², Y. Fujii², M. Fujita², M. Furic⁶, M. Gabrielyan⁸, L. Gan¹³, F. Garibaldi¹⁴, D. Gaskell¹², A. Gasparian⁵, Y. Han³, O. Hashimoto^2,*, T. Horn¹², B. Hu¹⁵, Ed. V. Hungerford¹⁶, M. Jones¹², H. Kanda², M. Kaneta², S. Kato¹⁷, M. Kawai², H. Khanal⁸, M. Kohl³, A. Liyanage³, W. Luo¹⁵, K. Maeda², A. Margaryan⁷, P. Markowitz⁸, T. Maruta², A. Matsumura², V. Maxwell⁸, D. Meekins¹², A. Mkrtchyan⁷, H. Mkrtchyan⁷, S. Nagao², S. N. Nakamura², A. Narayan¹⁸, C. Neville⁸, G. Niculescu¹⁹, M. I. Niculescu¹⁹, A. Nunez⁸, Nuruzzaman¹⁸, Y. Okayasu², T. Petkovic⁶, J. Pochodzalla⁴, X. Qiu¹⁵, J. Reinhold⁸, V. M. Rodriguez²⁰, C. Samanta²¹, B. Sawatzky¹², T. Seva⁶, A. Shichijo², V. Tadevosyan⁷, L. Tang^3,12, N. Taniya², K. Tsukada², M. Veilleux⁹, W. Vulcan¹², F. R. Wesselmann²², S. A. Wood¹², T. Yamamoto², L. Ya³, Z. Ye³, K. Yokota², L. Yuan³, S. Zhamkochyan⁷, and L. Zhu³ (HKS (JLab E05-115) Collaboration)

¹Graduate School of Science, Kyoto University, Kyoto, Kyoto 606-8502, Japan
²Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
³Department of Physics, Hampton University, Hampton, Virginia 23668, USA
⁴Institute for Nuclear Physics, Johannes Gutenberg-University, D-55099 Mainz, Germany
⁵Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA
⁶Department of Physics, University of Zagreb, HR-10000 Zagreb, Croatia and Department of Applied Physics, University of Zagreb, HR-10000 Zagreb, Croatia
⁷A. I. Alikhanyan National Science Laboratory, Yerevan 0036, Armenia
⁸Department of Physics, Florida International University, Miami, Florida 27411, USA
⁹Department of Physics, Computer Science and Engineering, Christopher Newport University, Newport News, Virginia 23606, USA
¹⁰Istituto Nazionale di Fisica Nucleare, Sezione di Bari, University of Bari, I-70126 Bari, Italy
¹¹Department of Physics, Southern University at New Orleans, New Orleans, Louisiana 70126, USA
¹²Thomas Jefferson National Accelerator Facility (JLab), Newport News, Virginia 23606, USA
¹³Department of Physics, University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA
¹⁴INFN, Sezione Sanità, Istituto Superiore di Sanità, 00161 Rome, Italy
¹⁵Nuclear Physics Institute, Lanzhou University, Gansu 730000, China
¹⁶Department of Physics, University of Houston, Houston, Texas 77204, USA
¹⁷Department of Physics, Yamagata University, Yamagata, 990-8560, Japan
¹⁸Mississippi State University, Mississippi State, Mississippi 39762, USA
¹⁹Department of Physics and Astronomy, James Madison University, Harrisonburg, Virginia 22807, USA
²⁰División de Ciencias y Tecnología, Universidad Ana G. Méndez, Recinto de Cupey, San Juan 00926, Puerto Rico
²¹Department of Physics and Astronomy, Virginia Military Institute, Lexington, Virginia 24450, USA
²²Department of Physics, Xavier University of Louisiana, New Orleans, Louisiana 70125, USA

^*Deceased.

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Phys. Rev. C 103, L041301 – Published 5 April, 2021

DOI: https://doi.org/10.1103/PhysRevC.103.L041301

Abstract

Missing mass spectroscopy with the ( $e, e^{'} K^{+}$ ) reaction was performed at Jefferson Laboratory's Hall C for the neutron-rich $Λ$ hypernucleus ${}_{Λ}^{9}{Li}$ . The ground-state (g.s.) energy was obtained to be $B_{Λ}^{g . s .} = 8.84 \pm 0 . 17^{stat .} \pm 0 . 15^{sys .} MeV$ by using shell-model calculations of a cross-section ratio and an energy separation of the spin doublet states ( $3 / 2_{1}^{+}$ and $5 / 2_{1}^{+}$ ). In addition, peaks that are considered to be states of $[{}^{8}{Li} (3^{+}) \otimes s_{Λ} = 3 / 2_{2}^{+}, 1 / 2^{+}]$ and $[{}^{8}{Li} (1^{+}) \otimes s_{Λ} = 5 / 2_{2}^{+}, 7 / 2^{+}]$ were observed at $E_{Λ} (no . 2) = 1.74 \pm 0 . 27^{stat .} \pm 0 . 11^{sys .}$ and $E_{Λ} (no . 3) = 3.30 \pm 0 . 24^{stat .} \pm 0 . 11^{sys .} MeV$ , respectively. The $E_{Λ} (no . 3)$ is larger than shell-model predictions by a few hundred keV, and the difference would indicate that a ${}^{5}{He} + t$ structure is more developed for the $3^{+}$ state than those for the $2^{+}$ and $1^{+}$ states in a core nucleus ${}^{8}{Li}$ as a cluster model calculation suggests.

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Spectroscopy of $A = 9$ hyperlithium with the $(e, e^{'} K^{+})$ reaction

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Spectroscopy of A=9 hyperlithium with the (e,e′K+) reaction

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Spectroscopy of $A = 9$ hyperlithium with the $(e, e^{'} K^{+})$ reaction