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spectroscopy via the in-flight 
reaction at the J-PARC K1.8BR川崎 新吾*; 橋本 直; 谷田 聖; 他72名*
JPS Conference Proceedings (Internet), 26, p.022009_1 - 022009_5, 2019/11
The spectral shape of the baryon was measured via the in-flight reaction at the J-PARC K1.8BR beam-line (J-PARC E31). The second E31 physics run was carried out in January and February, 2018. Approximately 
kaons were irradiated on the deuteron target. The missing mass spectrum for the where the residual final-state particles were 
and 
("
" spectrum) was measured for the first time.
(1405) resonance via the reaction at J-PARC浅野 秀光*; 橋本 直; 谷田 聖; 他72名*
AIP Conference Proceedings 2130, p.040018_1 - 040018_6, 2019/07
The structure of the hyperon is an important and long-standing issue related to the 
-nucleus interaction. The J-PARC E31 experiment has been performed to investigate the spectrum shape. Because it is hard to form the directly by a 
scattering in free space, E31 uses the reaction with an incident kaon momentum of 1 GeV/
. We will identify three final states - 
, 
, so that the isospin structure of hyperon resonance states produced can be decomposed. The first physics run of the E31 experiment was performed in 2016. To enhance the statistics of the data set, we have performed the second physics run in the beginning of 2018. During the second run of E31, around kaons impacted on the deuteron target.
