High-precision three-dimensional field mapping of a high resolution magnetic spectrometer for hypernuclear spectroscopy at JLab

Fujii, Y.; Hashimoto, Osamu; Miyoshi, T.; Nakamura, S. N.; Ohtani, A.; Okayasu, Y.; Oyamada, M.; Yamamoto, Yosuke; Kato, S.; Matsui, Jumei; Sako, K.; Brindza, P.

doi:10.1016/j.nima.2015.06.010

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…The experiment was performed at JLab Hall C using continuous wave electron beams accelerated by CEBAF. = 0.844 GeV/c) at the target were measured by the High resolution Kaon Spectrometer (HKS) [27,28] and High resolution Electron spectrometer (HES), respectively. The HKS, which has a Q-Q-D magnet configuration, was constructed and used in the previous (e, e ′ K + ) experiment, JLab E01-011 [13,14].…”

Section: Methodsmentioning

confidence: 99%

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High Resolution Spectroscopic Study of $^{10}_Λ$Be

Gogami,

Chen,

Kawama

et al. 2015

Preprint

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Spectroscopy of a 10Λ Be hypernucleus was carried out at JLab Hall C using the (e, e ′ K + ) reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, was used to obtain an energy spectrum with a resolution of ∼ 0.78 MeV (FWHM). The well-calibrated spectrometer system of the present experiment using p(e, e ′ K + )Λ,Σ 0 reactions allowed us to determine the energy levels, and the binding energy of the ground state peak (mixture of 1 − and 2 − states) was obtained to be BΛ = 8.55 ± 0.07(stat.) ± 0.11(sys.) MeV. The result indicates that the ground state energy is shallower than that of an emulsion study by about 0.5 MeV which provides valuable experimental information on the charge symmetry breaking effect in the ΛN interaction.

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Section: Methodsmentioning

confidence: 99%

“…This reaction particle resolution results in sub-MeV energy resolution (FWHM) of hypernuclear energy levels. Refer to [14,27,28] for details of the magnets and particle detector systems.…”

Section: Methodsmentioning

confidence: 99%

High Resolution Spectroscopic Study of $^{10}_Λ$Be

Gogami,

Chen,

Kawama

et al. 2015

Preprint

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“…Figure 3 shows a schematic of the experimental setup of JLab E05-115 in the experimental Hall C. The electron beam at E e = 2.344 GeV was incident on the production target which was installed at the entrance of the SPL. A K + and scattered electron via the (e, e ′ K + ) reaction were bent in opposite directions by the SPL and were measured with a high-resolution kaon spectrometer (HKS) [58,59] and a high-resolution electron spectrometer (HES), respectively. A "pre"-chicane beam line was designed and used instead of the existing beam line at JLab Hall C. A combination of the pre-chicane beam line and SPL allowed us to transport unused beams and Bremsstrahlung photons generated in the target toward beam and photon dumps, respectively, without any additional bending magnets between the target and dumps.…”

Section: B Magnetic Spectrometersmentioning

confidence: 99%

Experimental techniques and performance of Λ-hypernuclear spectroscopy with the (e,e′
Gogami
¹
,
Chen
²
,
Fujii
³

et al. 2018
Nuclear Instruments and Methods in Physics Research Section A:
12
0
6
0
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The missing-mass spectroscopy of Λ hypernuclei via the (e, e ′ K + ) reaction has been developed through experiments at JLab Halls A and C in the last two decades. For the latest experiment, E05-115 in Hall C, we developed a new spectrometer system consisting of the HKS and HES; resulting in the best energy resolution (∆E ≃ 0.5-MeV FWHM) and BΛ accuracy (∆BΛ ≤ 0.2 MeV) in Λhypernuclear reaction spectroscopy. This paper describes the characteristics of the (e, e ′ K + ) reaction compared to other reactions and experimental methods. In addition, the experimental apparatus, some of the important analyses such as the semi-automated calibration of absolute energy scale, and the performance achieved in E05-115 are presented. II. MISSING-MASS SPECTROSCOPY WITHTHE (e, e ′ K + ) REACTION Λ hypernuclei were first found in nuclear emulsions that were exposed to cosmic rays [19]. Later, the Λ binding energies B Λ , defined in Eq. (17), of A ≤ 15 hypernuclei were obtained in experiments with nuclear emulsions exposed to mesic beams such as K − [20]. A typical accuracy on the B Λ determination is approximately ∆B Λ ≤ 0.1 MeV including systematic errors. Except for a few cases, emulsion experiments were able to determine only the ground-state B Λ as they derived the B Λ by tracing weak decay processes of Λ hypernuclei which take a longer time than deexcitations emitting γ-rays and neutrons. In addition, with the emulsion technique, the complexity of decay sequences from heavier hypernuclei prevented B Λ measurements with the mass numbers larger

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“…The experiment was designed to perform spectroscopy for A = 7, 12 and 28 hypernuclear systems. A new magnetic spectrometer (High Resolution Kaon Spectrometer, HKS [11]), which was designed to achieve a momentum resolution of ∆p/p ≃ 2 × 10 −4 FWHM, was constructed and introduced for a K + detection in JLab E01-011. The introduction of HKS allowed us to measure Λ hypernuclear structures with an energy resolution of about 0.7 MeV (FWHM).…”

Section: Experimental Setup and Analysismentioning

confidence: 99%

Spectroscopic Study of Λ Hypernuclei with Electron Beams at Jefferson Lab

Nakamura

Gogami

Tang

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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The missing mass spectroscopy of Λ hypernuclei with the (e, e ′ K + ) reaction was started from 2000 at Jefferson Lab. In this fifteen years, various hypernuclei (A = 7 -52) including hyperon (Λ, Σ 0 ) productions have been studied with newly developed experimental techniques. The (e, e ′ K + ) reaction spectroscopy of Λ hypernuclei features its capability of absolute missing mass calibration and production of new species of hypernuclei which are the isospin partners of well studied hypernuclei by (K − , π − ) and (π + , K + ) reactions. In this paper, we will review how we established the (e, e ′ K + ) spectroscopic study of hypernuclei.

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High-precision three-dimensional field mapping of a high resolution magnetic spectrometer for hypernuclear spectroscopy at JLab

Cited by 9 publications

References 8 publications

High Resolution Spectroscopic Study of $^{10}_Λ$Be

High Resolution Spectroscopic Study of $^{10}_Λ$Be

Experimental techniques and performance of Λ-hypernuclear spectroscopy with the (e,e′
Gogami
¹
,
Chen
²
,
Fujii
³

et al. 2018
Nuclear Instruments and Methods in Physics Research Section A:
12
0
6
0
View full text Add to dashboard Cite

Spectroscopic Study of Λ Hypernuclei with Electron Beams at Jefferson Lab

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High-precision three-dimensional field mapping of a high resolution magnetic spectrometer for hypernuclear spectroscopy at JLab

Cited by 9 publications

References 8 publications

High Resolution Spectroscopic Study of $^{10}_Λ$Be

High Resolution Spectroscopic Study of $^{10}_Λ$Be

Experimental techniques and performance of Λ-hypernuclear spectroscopy with the (e,e′Gogami1, Chen2, Fujii3 et al. 2018Nuclear Instruments and Methods in Physics Research Section A: 12060View full textAdd to dashboardCite

Spectroscopic Study of Λ Hypernuclei with Electron Beams at Jefferson Lab

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About

Experimental techniques and performance of Λ-hypernuclear spectroscopy with the (e,e′
Gogami
¹
,
Chen
²
,
Fujii
³

et al. 2018
Nuclear Instruments and Methods in Physics Research Section A:
12
0
6
0
View full text Add to dashboard Cite