The second GeV tagged photon beamline at ELPH

Ishikawa, T.; Fujimura, H.; Ishida, Takashi; Kasagi, J.; Kinoshita, Toyohiko; Kuwasaki, S.; Miyahara, F.; Miyamoto, A.; Mochizuki, K.; Nakabayashi, T.; Nanao, Max H.; Nawa, K.; Okada, Y.; Okamura, Koji; Onodera, Y.; Saito, Yoshihiko; Satou, Kenichirou; Sengoku, Masanori; Shimizu, H.; Suzuki, K.; Suzuki, Shoji; Tajima, Y.; Takahashi, Toshiharu; Yamazaki, H.; Yonemura, Hiroshi; Yoshida, Hiroshi

doi:10.1016/j.nima.2010.07.051

Cited by 37 publications

(7 citation statements)

References 19 publications

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“…Two series of meson photoproduction experiments [13] were carried out using the tagged photon beam [14,15] at the Research Center for Electron Photon Science (ELPH), Tohoku University. The photon beam was produced by a bremsstrahlung process with a carbon fiber from the 0.93 GeV circulating electrons in a synchrotron called the STretcher Booster (STB) ring [16].…”

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confidence: 99%

“…The solid angle of FOREST is approxi-2 mately 88% in total. The typical tagging rate was 2.8 MHz, and the photon transmittance (so-called tagging efficiency) was approximately 42% [14]. The trigger condition of the data acquisition (DAQ) was…”

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confidence: 99%

“…The lower limit of χ 2 probability 0.4 makes the contamination less than 5%, which is much less than the statistical error of the measured total cross section (∼ 20%). Because accidental coincidence events exist between 3 the photon-tagging counter, STB-Tagger II [14], and FOREST, sideband background subtraction was performed. An invariant mass distribution of two final-state particles was investigated to give the difference of the measured distributions between the experimental data and pure phasespace simulation.…”

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confidence: 99%

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First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

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The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV for the first time. No clear resonancelike behavior is observed in the excitation function for W γd = 2.38-2.61 GeV, where the d * (2380) dibaryon resonance observed at COSY is expected to appear. The measured excitation function is consistent with the existing theoretical calculation for this reaction. The upper limit of the total cross section is found to be 0.034 µb for the dibaryon resonance at W γd = 2.37 GeV (90% confidence level) in the γd → π 0 π 0 d reaction.

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First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

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“…A test experiment was performed using positron beams in the positron/electron beam line at ELPH [13,14] in order to investigate the basic performance factors of the prototype waterČerenkov detector such as position and angular dependencies of NPE. Figure 7 shows a schematic drawing of the experimental setup.…”

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confidence: 99%

Development of water Čerenkov detector for on-line proton rejection in Ξ− hypernuclear spectroscopy via the (K
Gogami
¹
,
Amano
²
,
Kanatsuki
³

et al. 2016
Nuclear Instruments and Methods in Physics Research Section A:
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The missing mass spectroscopy of Ξ − hypernuclei with the (K − ,K + ) reaction is planned to be performed at the J-PARC K1.8 beam line by using a new magnetic spectrometer, Strangeness −2 Spectrometer (S-2S). AČerenkov detector with a radiation medium of pure water (refractive index of 1.33) is designed to be used for on-line proton rejection for a momentum range of 1.2 to 1.6 GeV/c in S-2S. Prototype waterČerenkov detectors were developed and tested with positron beams and cosmic rays to estimate their proton-rejection capability. We achieved an average number of photoelectrons of greater than 200 with the latest prototype for cosmic rays, which was stable during an expected beam time of one month. The performance of the prototype in the cosmic-ray test was well reproduced with a Monte Carlo simulation in which some input parameters were adjusted. Based on the Monte Carlo simulation, we expect to achieve > 90% proton-rejection efficiency while maintaining > 95% K + survival ratio in the whole S-2S acceptance. The performance satisfies the requirements to conduct the spectroscopic study of Ξ − hypernuclei at J-PARC.

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“…The beam profile was checked by HSBPM when the beam course was tuned in the experimental period. The detailed information can be found in Refs [30,31]…”

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Neutral Kaon Spectrometer 2

Kaneta

Beckford

Fujii

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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A large-acceptance spectrometer, Neutral Kaon Spectrometer 2 (NKS2), was newly constructed to explore various photoproduction reactions in the giga- * Corresponding author. electronvolt region at the Laboratory of Nuclear Science (LNS, currently ELPH), Tohoku University. The spectrometer consisted of a dipole magnet, drift chambers, and plastic scintillation counters. NKS2 was designed to separate pions and protons in a momentum range of less than 1 GeV/c, and was placed in a tagged photon beamline. A cryogenic H 2 /D 2 target fitted to the spectrometer were designed. The design and performance of the detectors are described. The results of the NKS2 experiment on analyzing strangeness photoproduction data using a 0.8-1.1 GeV tagged photon beam are also presented.

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The second GeV tagged photon beamline at ELPH

Cited by 37 publications

References 19 publications

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

Development of water Čerenkov detector for on-line proton rejection in Ξ− hypernuclear spectroscopy via the (K
Gogami
¹
,
Amano
²
,
Kanatsuki
³

et al. 2016
Nuclear Instruments and Methods in Physics Research Section A:
5
0
6
0
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Neutral Kaon Spectrometer 2

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The second GeV tagged photon beamline at ELPH

Cited by 37 publications

References 19 publications

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

Development of water Čerenkov detector for on-line proton rejection in Ξ− hypernuclear spectroscopy via the (KGogami1, Amano2, Kanatsuki3 et al. 2016Nuclear Instruments and Methods in Physics Research Section A: 5060View full textAdd to dashboardCite

Neutral Kaon Spectrometer 2

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Product

Resources

About

Development of water Čerenkov detector for on-line proton rejection in Ξ− hypernuclear spectroscopy via the (K
Gogami
¹
,
Amano
²
,
Kanatsuki
³

et al. 2016
Nuclear Instruments and Methods in Physics Research Section A:
5
0
6
0
View full text Add to dashboard Cite