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Journal Articles

Observation of a $$bar{K}NN$$ bound state in the $$^{3}$$He $$(K^-, Lambda p)n$$ reaction

Yamaga, Takumi*; Hashimoto, Tadashi; Tanida, Kiyoshi; 66 of others*

Physical Review C, 102(4), p.044002_1 - 044002_14, 2020/10

 Times Cited Count:13 Percentile:87.6(Physics, Nuclear)

Journal Articles

Results of $$bar{K}NN$$ search via the $$(K^-, n)$$ reaction at J-PARC

Yamaga, Takumi*; Hashimoto, Tadashi; Tanida, Kiyoshi; 66 of others*

JPS Conference Proceedings (Internet), 26, p.023008_1 - 023008_6, 2019/11

Journal Articles

Study of the elementary $$(K^-,n)$$ reactions to search for the $$bar{K}NN$$ bound state via the $$^3$$He$$(K^-,n)$$ reaction at J-PARC

Yamaga, Takumi*; Tanida, Kiyoshi; 74 of others*

AIP Conference Proceedings 1735, p.040007_1 - 040007_6, 2016/05

 Times Cited Count:0 Percentile:0.41

Journal Articles

Spectroscopic study of hyperon resonances below $$bar{K}N$$ threshold via the $$(K^-,n)$$ reaction on deuteron

Yamaga, Takumi*; Tanida, Kiyoshi; J-PARC E31 Collaboration*; 70 of others*

JPS Conference Proceedings (Internet), 8, p.021016_1 - 021016_5, 2015/09

Oral presentation

Development of large acceptance spectrometer for systematic study of kaonic nuclei at J-PARC

Nanamura, Takuya; Hashimoto, Tadashi; Sakuma, Fuminori*; Yamaga, Takumi*; Iwasaki, Masahiko*

no journal, , 

Bound states caused by attractive $$bar{K}N (I=0)$$ interaction, such as $$Lambda(1405)$$ and kaonic nuclei, are interesting systems with strangeness. Many experimental attempts have tried to establish an existence of the lightest kaonic nuclei, "$$K^- pp$$". However, no clear conclusion was reached. Recently, J-PARC E15 collaboration searched for "$$K^- pp$$", using the in-flight $$K^- +^3$$He reaction with an exclusive analysis of the $$Lambda p n$$ final state. By reconstructing not only the $$Lambda p$$ invariant-mass but also momentum transfer to the $$Lambda p$$ system, they definitely showed event concentration interpreted as "$$K^- pp$$" bound state. Moreover, small spatial size of "$$K^- pp$$" is implied. In order to expand this successful experimental method to heavier kaonic nuclei, such as $$bar{K}NNN, bar{K}NNNN, dots$$, and detailed study for fundamental properties of the $$bar{K}NN$$ state, we are developing a new magnetic spectrometer. Because an exclusive analysis requires detections of decay particles from the kaonic nuclei as many as possible, the new spectrometer will have larger solid angle of 93%. To realize it, superconducting solenoid magnet and some detectors, a cylindrical drift chamber and charged particle/neutron counters, are 3-4 meters long. Detection efficiencies for neutron would be improved at least 1.7 times better than current spectrometer. In this presentation, I will talk about designs and development status of the new large acceptance spectrometer.

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