16 research outputs found
Beam and SKS spectrometers at the K1.8 beam line
High-resolution spectrometers for both incident beams and scattered particles have been constructed at the K1.8 beam line of the Hadron Experimental Facility at J-PARC. A point-to-point optics is realized between the entrance and exit of QQDQQ magnets for the beam spectrometer. Fine-pitch wire chamber trackers and hodoscope counters are installed in the beam spectrometer to accept a high rate beam up to 107 Hz. The superconducting kaon spectrometer for scattered particles was transferred from KEK with modifications to the cryogenic system and detectors. A missing-mass resolution of 1.9 Ā± 0.1 MeV/c2 (FWHM) was achieved for the ā peaks of (ĻĀ±, K+) reactions on a proton target in the first physics run of E19 in 2010
Comparison of
Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(Kā, Ļ0) 3ĪH reaction. In this contribution, we will demonstrate our capability to provide 3ĪH binding energy information by deriving the production cross section ratio, Ļ3ĪH/Ļ4ĪH. The production cross section data for 3ĪH and 4ĪH are already available as the pilot run of E73 experiment and data analysis is in progress
J-PARC hadron experimental facility extension project
The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics
J-PARC E27 Experiment to Search for a Kāpp Bound State
We have carried out an experimental search for the simplest kaonic nucleus, , by using the reaction at = 1.69ā
GeV/. The differential cross section of this reaction with covering a wide missing-mass range from the production threshold to the region has been measured for the first time. The inclusive missing-mass shape of the and production region was understood with a simple quasi-free picture except for an enhancement at 2.13ā
GeV/ due to a cusp. An obtained peak attributed to production was significantly shifted to the low mass side compared with the simulation by ā
MeV/