HYP HRS-HKS

Hypernuclear Project with HRS-HKS at Hall A.
We are also considering an option to perform the experiment at Hall C instead of Hall A.

Overview

Physics motivation

• ^3,4_ΛH (E12-19-002): ΛN CSB, Hypertriton puzzle
• ^40,48_ΛK (E12-15-008): ΛNN interaction, Isospin dependent interaction
• ²⁰⁸_ΛTl (E12-20-013): ΛNN interaction

Experimental equipment

HRS-HKS at Hall A
The experiment is originally planned to be carried out with high resolution spectrometers HRS and HKS
in JLab Hall A for high precision hypernuclear measurement.
Electron beams at 4.24 GeV will be impinged on various targets (^{3, 4}He, ^{40, 48}Ca, ²⁰⁸Pb),
and scattered electrons and K⁺s from the (e,e'K⁺) reaction
will be detected by the spectrometers for missing mass spectroscopy of hypernuclei.

HES-HKS at Hall C
There is an option of the usage of HES and HKS at Hall C for the experiment.
However, an optics analysis for the gas target needs at least
one vertical spectrometer by which the production vertex along
the beam direction can be reconstructed with the reasonable resolution.
The spectrometers HES and HKS are both horizontal bending spectrometers,
and need to modify at least one of them to the vertical bending one.

Documents

DAQ

• FPGA

Theses

2021

• B. Pandey (Ph.D. thesis, Hampton Univ., 2021)
  • "A Possible Observation of Sigma-nn Continuum Structures and A Bound Sigma-NN State Using the (e,e'K⁺) Reaction"
  • web page
• K. Katayama (Master's thesis, Kyoto Univ., 2021)
  • "Development of HRS-HKS trigger system with FPGA -High precision measurement of hypernuclei at JLab-"
  • PDF (in Japanese).
• T. Toyoda (Master's thesis, Kyoto Univ., 2021)
  • "Basic design of gas target for high accuracy mass measurement of hypertriton at JLab"
  • PDF (in Japansese):
• T. Akiyama, "",
  Master's Thesis, Tohoku University, Mar 2021 (in Japanese).
• K. Okuyama, "",
  Master's Thesis, Tohoku University, Mar 2021 (in Japanese).

Meetings

• Weekly Meeting etc.
• Strategy Meeting
• Collaboration Meeting

Publications

• T. Gogami et al., "Accurate Λ hypernuclear spectroscopy with electromagnetic probe at Jefferson Lab", AIP Conference Proceedings 2319, 080019 (2021) [1]

Presentations

2021

ELPH workshop C031, ELPH, Nov 4-5, 2021

ELPH workshop E031, ELPH, Sendai, Japan, Nov 4-5, 2021

• S.N. Nakamura, "Present and future of Λ hypernuclear research at JLab", Nov 4, 2021 (PDF)

Seminar of Nucl. Theory group of Kyoto Univ. (Kyoto Univ., Oct 2021)

• T. Gogami, "New results and prospects of high precision hypernuclear experiment at JLab", Oct 29, 2021 (PDF)

JPS Meeting (Online, Sep 2021)

• T. Gogami, "Hypernuclear Physics at Jefferson Laboratory", Sep 17, 2021 (PDF)

WEPH 2021 (Online, Sep 8-9, 2021)

Workshop of Electro- and Photoproduction of Hypernuclei and Related Topics 2021

• F. Garibaldi, "Studying Λ interactions in nuclear matter with the ²⁰⁸Pb(e,e'K⁺)²⁰⁸_ΛTl reaction", Sep 8, 2021
• T. Gogami, "Hypertriton and nnΛ measurements at Jefferson Lab" Sep 9, 2021 (PDF)

Hall A/C Collaboration Meeting (Online, Jul 8-9, 2021)

• T. Gogami, "High accuracy measurement of nuclear masses of hyperhydrogens (C12-19-002)", Jul 9, 2021
  → https://indico.jlab.org/event/451/

JPS Annual Meeting (Online, 12-15 Mar, 2021)

• K.N. Suzuki, "Cross section measurement of the ³H(e,e'K⁺)nnΛ reaction at JLab", Mar 12, 2021 (PDF)
• K. Okuyama
• T. Akiyama
• K. Katayama
• Y.R. Nakamura

HIN2020 (Online+Kyoto(Japan), 8-10 Mar, 2021)

http://www2.yukawa.kyoto-u.ac.jp/~hin2020/

• J. Renhold, "The future hypernuclear program at Jefferson Lab", Mar 10, 2021

APFB2020 (Online+Kanazawa(Japan), 1-5 Mar, 2021)

http://www.rcnp.osaka-u.ac.jp/Divisions/np1-a/apfb2020/

• K. Katayama, "Trigger system development for the accurate B_Λ measurement of Lambda hypertriton at JLab"
• K. Itabashi, "Study of the nnΛ state and Λn interaction at Jefferson Lab"
• T. Gogami, "Lambda hypertriton binding energy measurement at Jefferson Lab", Mar 2, 2021 (PDF)

Hall A Winter Collaboration Meeting (Online, Jan 21-22, 2021)

• B. Pandey, "", Jan 21, 2021
• T. Gogami, "Future hypernuclear experiments with HKS", Jan 22, 2021 (PDF)