The experiments with the High Resolution Kaon Spectrometer at JLab Hall C and the new spectroscopy of ${}_{\Lambda }^{12}\text{B}$ hypernuclei

Abstract

Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using the $(e,e^{\prime }{K}^{+})$ reaction was completed, two additional experiments, E01-011 and E05-115, were performed at Jefferson Lab. These later experiments used a modified experimental design, the "tilt method", to dramatically suppress the large electromagnetic background, and allowed for a substantial increase in luminosity. Additionally, a new kaon spectrometer, HKS (E01-011), a new electron spectrometer, HES, and a new splitting magnet were added to produce precision, high-resolution hypernuclear spectroscopy. These two experiments, E01-011 and E05-115, resulted in two new data sets, producing sub-MeV energy resolution in the spectra of ${}_{\Lambda }^7\text{He}$, ${}_{\Lambda }^{12}\text{B}$ and ${}_{\Lambda }^{28}\text{Al}$ and ${}_{\Lambda }^7\text{He}$, ${}_{\Lambda }^{10}\text{Be}$, ${}_{\Lambda }^{12}\text{B}$ and ${}_{\Lambda }^{52}\text{V}$. All three experiments obtained a ${}_{\Lambda }^{12}\text{B}$, spectrum, which is the most characteristic $p$-shell hypernucleus and is commonly used for calibration. Independent analyses of these different experiments demonstrate excellent consistency and provide the clearest level structure to date of this hypernucleus as produced by the $(e,e^{\prime }{K}^{+})$ reaction. This paper presents details of these experiments, and the extraction and analysis of the observed ${}_{\Lambda }^{12}\text{B}$ spectrum.

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Cited by in corpus (22)

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• Observation of Directed Flow of Hypernuclei ${}_{\Lambda }^3$H and ${}_{\Lambda }^4$H in $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV Au+Au Collisions at RHIC
• Hyperon halo structure of C and B isotopes
• High-resolution hypernuclear spectroscopy at Jefferson Lab, Hall A
• Effects of hyperonic many-body force on $B_{\Lambda }$ values of hypernuclei
• Precise determination of ${}_{\Lambda }^{12}$C level structure by $\gamma$-ray spectroscopy
• Low-lying level structure of $\Lambda$ hypernuclei and spin dependence of $\Lambda N$ interaction with antisymmetrized molecular dynamics
• High Resolution Hypernuclear Spectroscopy at Jefferson Lab Hall A
• The cross-section measurement for the ${}^3\text{H}(e,e^{\prime }{K}^{+})nn\Lambda$ reaction
• Spectroscopy of $A=9$ hyperlithium by the $(e,e^{\prime }{K}^{+})$ reaction
• Excitation energy shift and size difference of low-energy levels in $p$-shell $\Lambda$ hypernuclei
• Experimental techniques and performance of $\Lambda$-hypernuclear spectroscopy with the $(e,e^{\prime }{K}^{+})$ reaction
• Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications
• Neutral Kaon Spectrometer 2
• Charge symmetry breaking in hypernuclei within RMF model
• Structures of $p$-shell double-$\Lambda$ hypernuclei studied with microscopic cluster models
• Fermi motion effects in electroproduction of hypernuclei
• $p$-shell hypernuclear structures using the Gogny-interaction shell model
• Backward-angle electroproduction of ${\eta }^{\prime }$ mesons off protons at $W=2.13\text{GeV}$ and $Q^2=0.46{\left(\text{GeV}/c\right)}^2$