The K1.8BR spectrometer system at J-PARC

Abstract

A new spectrometer system was designed and constructed at the secondary beam line K1.8BR in the hadron hall of J-PARC to investigate $\bar{K}N$ interactions and $\bar{K}$-nuclear bound systems. The spectrometer consists of a high precision beam line spectrometer, a liquid ${}^3$He/${}^4$He/D${}_2$ target system, a Cylindrical Detector System that surrounds the target to detect the decay particles from the target region, and a neutron time-of-flight counter array located $\sim$15 m downstream from the target position. Details of the design, construction, and performance of the detector components are described.

33 pages, 25 figures

References in corpus (19)

• A New Measurement of Kaonic Hydrogen X rays
• Effective Kbar N interaction based on chiral SU(3) dynamics
• Variational calculation of the ppK^- system based on chiral SU(3) dynamics
• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• The basic K nuclear cluster K- pp and its enhanced formation in the p + p -> K+ + X reaction
• $\bar{K}NN$ quasi-bound state and the $\bar{K}N$ interaction: coupled-channel Faddeev calculations of the $\bar{K}NN-\pi \Sigma N$ system
• The gamma + p to K+ + Lambda and gamma + p to K+ + Sigma0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV
• Advances in Thick GEM-like gaseous electron multipliers. Part I: atmospheric pressure operation
• Resonance energy of the barKNN-piYN system
• Variational calculations for K-few-nucleon systems
• Precision measurement of the $3d\to 2p$ x-ray energy in kaonic ${}^4$He
• S-Wave Scattering of Fermion Revisited
• First measurement of kaonic helium-3 X-rays
• Experimental confirmation of the Lambda(1405) Ansatz from resonant formation of a K-p quasi-bound state in K- absorption by 3He and 4He
• A Novel UV Photon Detector with Resistive Electrodes
• Formation spectra of light kaonic nuclei by in-flight ($\bar{K},N$) reactions with chiral unitary amplitude
• ppK- bound states from Skyrmions
• Deeply-bound $K^{-}pp$ state in the ${}^3$He(in-flight $K^{-}$, $n$) spectrum and its moving pole near the $\pi \Sigma N$ threshold
• Development of liquid helium-3 target for experimental studies of antikaon-nucleon interaction at J-PARC

Cited by in corpus (6)

• Structure near $K^{-}$+$p$+$p$ threshold in the in-flight ${}^3$He$(K^{-},\Lambda p)n$ reaction
• Observation of a $\bar{K}NN$ bound state in the ${}^3\mathrm{He}(K^{-},\Lambda p)n$ reaction
• Pole position of $\Lambda (1405)$ measured in $d(K^{-},n)\pi \Sigma$ reactions
• High-resolution kaonic-atom x-ray spectroscopy with transition-edge-sensor microcalorimeters
• Measurement of ${}^{3,4}$He($K^{-},{\pi }^0$)${}_{\Lambda }^{3,4}$H reaction cross section and evaluation of hypertriton $\Lambda$ binding energy
• Precise lifetime measurement of ${}_{\Lambda }^4$H hypernucleus using in-flight ${}^4$He$(K^{-},{\pi }^0{)}_{\Lambda }^4$H reaction