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Journal Articles

Observation of a $$Xi$$ bound state in the $$^{12}$$C$$(K^-, K^+)$$ reaction at 1.8 GeV/$$c$$

Nagae, Tomofumi*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji; Nanamura, Takuya*; Naruki, Megumi; et al.

AIP Conference Proceedings 2130, p.020015_1 - 020015_9, 2019/07

https://doi.org/10.1063/1.5118383
 Times Cited Count：12 Percentile：98.33(Physics, Nuclear)

Journal Articles

Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

Ekawa, Hiroyuki; Ashikaga, Sakiko; Hasegawa, Shoichi; Hashimoto, Tadashi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji*; Nanamura, Takuya; et al.

Progress of Theoretical and Experimental Physics (Internet), 2019(2), p.021D02_1 - 021D02_11, 2019/02

https://doi.org/10.1093/ptep/pty149
 Times Cited Count：25 Percentile：83.76(Physics, Multidisciplinary)

Journal Articles

Trapping probability of strangeness via $$mathrm{Xi}^{-}$$ hyperon capture at rest in nuclear emulsion

Theint, A. M. M.*; Ekawa, Hiroyuki; Yoshida, Junya; 7 of others*

Progress of Theoretical and Experimental Physics (Internet), 2019(2), p.021D01_1 - 021D01_10, 2019/02

https://doi.org/10.1093/ptep/pty147
 Times Cited Count：6 Percentile：48.1(Physics, Multidisciplinary)

Journal Articles

Charge identification of low-energy particles for double-strangeness nuclei in nuclear emulsion

Kimbara, Shinji*; Ekawa, Hiroyuki; Hayakawa, Shuhei; Yoshida, Junya; 12 of others*

Progress of Theoretical and Experimental Physics (Internet), 2019(1), p.011H01_1 - 011H01_9, 2019/01

https://doi.org/10.1093/ptep/pty137
 Times Cited Count：4 Percentile：36.66(Physics, Multidisciplinary)

A development has been achieved in the identification method of the charges 1 to 5 of nuclides from the decay of double hypernuclei to be uniquely recognized by their nuclear species. The method is basically the measurement of track volume by the widths, depths, and angles of tracks of exposed nuclei of $$^{1}$$H, $$^{4}$$He, $$^{7}$$Li, $$^{9}$$Be, and $$^{11}$$B in nuclear emulsion at Riken Projectile-fragment Separator of RIKEN Radioactive Isotope Beam Factory. After their calibration by $$alpha$$ particles, we obtained a quadric function to present a unified recognition of tracks with volume ratios of five nuclei to the $$alpha$$ particles. The function in the emulsion has been applied to a candidate event of a $$Xi$$ hypernucleus for identification of the production and decay processes. We succeeded in recognizing a daughter nuclear fragment of a single-$$Lambda$$ hypernucleus as $$^{6}$$He with a likelihood ratio of 0.9; the process was then uniquely identified as $$Xi$$$$^{-}$$ + $$^{14}$$N $$rightarrow$$ $$_{Lambda}$$$$^{9}$$Be + $$_{Lambda}$$$$^{5}$$He + $$n$$.

Journal Articles

First determination of the level structure of an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; et al.

Physical Review Letters, 120(13), p.132505_1 - 132505_5, 2018/03

AA2018-0124.pdf:0.62MB

https://doi.org/10.1103/PhysRevLett.120.132505
 Times Cited Count：8 Percentile：54.37(Physics, Multidisciplinary)

Journal Articles

Spectroscopy of nuclei with multi-strangeness by using new S-2S spectrometer at J-PARC

Gogami, Toshiyuki*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Ichikawa, Yudai; Nanamura, Takuya; Naruki, Megumi; Sako, Hiroyuki; et al.

JPS Conference Proceedings (Internet), 18, p.011031_1 - 011031_6, 2017/11

https://doi.org/10.7566/JPSCP.18.011031

Journal Articles

$$gamma$$-ray spectroscopy of hypernuclei; Recent results and prospect at J-PARC

Tamura, Hirokazu*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 17, p.011004_1 - 011004_11, 2017/07

https://doi.org/10.7566/JPSCP.17.011004

Journal Articles

Search for excited state of $$Sigma$$ hypernucleus in the J-PARC E13 experiment

Nakagawa, Manami*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 17, p.012009_1 - 012009_4, 2017/07

https://doi.org/10.7566/JPSCP.17.012009

Journal Articles

The First gamma-ray spectroscopic study of $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 17, p.012004_1 - 012004_4, 2017/07

https://doi.org/10.7566/JPSCP.17.012004

Journal Articles

Observation of $$Xi$$ bound states in the $$^{12}$$C$$(K^-,K^+)X$$ reaction at 1.8 GeV/$$c$$ in J-PARC

Nagae, Tomofumi*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; et al.

Proceedings of Science (Internet), 281, p.038_1 - 038_7, 2017/05

https://doi.org/10.22323/1.281.0038

Journal Articles

Study of the $$overline{K}$$-nucleus interaction by using the $$^{12}$$C(K$$^{-}$$, p) reaction at J-PARC

Ichikawa, Yudai; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Kimbara, Shinji; Nakada, Yoshiyuki; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 13, p.020007_1 - 020007_5, 2017/02

https://doi.org/10.7566/JPSCP.13.020007

An interaction between K$$^{bar}$$ and nucleus is studied by using the X-ray from the kaonic atoms for a long time. However, it is difficult to determine the K$$^{bar}$$-nucleus interaction by using only kaonic-atoms data because the value of shift and width of the X-ray depend not only the potential depth but also the type of theoretical model. Thus, we study the $$overline{K}$$-nucleus interaction by comparing an observed missing-mass spectrum of the $$^{12}$$C(K$$^{-}$$, p) reaction with the DWIA calculation. Such a study has already reported from KEK-E548 experiment. However, their experiment is not enough to determine these interaction because they were pointed out about the experimental condition. Thus, we performed the further experiment to take the real spectrum of $$^{12}$$C(K$$^{-}$$, p) reaction at J-PARC.

Journal Articles

Double hypernuclei experiment with hybrid emulsion method at J-PARC

Ekawa, Hiroyuki; J-PARC E07 Collaboration*

JPS Conference Proceedings (Internet), 8, p.021019_1 - 021019_6, 2015/09

Double hypernuclei are important probes to study the system with strangeness $$S$$ = -2. A double hypernucleus $${}^{6}_{LambdaLambda}$$He was clearly identified in the KEK E373 experiment. We are planning an upgrade experiment to search for double hypernuclei at the J-PARC K1.8 beam line. In the experiment, the KURAMA spectrometer system will detect $$Xi^-$$ production in the $$(K^-, K^+)$$ reaction on a diamond target. Tracks in SSDs and emulsion will be automatically connected by a hybrid method. This statistics is more than 10 times as high as that of the KEK E373 experiment. Discoveries of more than 10 new double hypernuclear species are expected. On the other hand, we will also observe $$X$$ rays from $$Xi^-$$ atoms with a Germanium detector array. This will be the first measurement in the world and give information on the $$Xi^-$$ potential shape at the nuclear surface region. In this talk physics motivation and current status of the J-PARC E07 experiment will be presented.

Journal Articles

J-PARC E27 experiment to search for a $$K^{-}pp$$ bound state

Ichikawa, Yudai; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; et al.

JPS Conference Proceedings (Internet), 8, p.021020_1 - 021020_7, 2015/09

https://doi.org/10.7566/JPSCP.8.021020

We have carried out an experimental search for the simplest kaonic nucleus, $$K^{-}pp$$, by using the $$d(pi^{+},K^{+})$$ reaction at $$p$$ = 1.69 GeV/$$c$$. The differential cross section of this reaction with covering a wide missing-mass range from the $$Lambda$$ production threshold to the $$Lambda$$(1405)/$$Sigma$$(1385) region has been measured for the first time. The inclusive missing-mass shape of the $$Lambda$$ and $$Sigma$$ production region was understood with a simple quasi-free picture except for an enhancement at 2.13 GeV/$$c^{2}$$ due to a $$Sigma N$$ cusp. An obtained peak attributed to $$Y^{*}$$ production was significantly shifted to the low mass side compared with the simulation by -24 MeV/$$c^{2}$$.

Journal Articles

J-PARC E19 experiment; Pentaquark $$Theta^+$$ search in hadronic reaction at J-PARC

Takahashi, Tomonori*; Ekawa, Hiroyuki; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; et al.

JPS Conference Proceedings (Internet), 8, p.022011_1 - 022011_6, 2015/09

https://doi.org/10.7566/JPSCP.8.022011

Journal Articles

Study of $$Lambda N$$ interaction via the $$gamma$$-ray spectroscopy of $$^4_{Lambda}$$He and $$^{19}_{Lambda}$$F (E13-1st)

Yamamoto, T. O.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; et al.

JPS Conference Proceedings (Internet), 8, p.021017_1 - 021017_6, 2015/09

https://doi.org/10.7566/JPSCP.8.021017

Journal Articles

Measurement of the $$Lambda$$ spin-flip $$B(M1)$$ value in hypernuclei

Sasaki, Yuki*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; et al.

JPS Conference Proceedings (Internet), 8, p.022013_1 - 022013_4, 2015/09

https://doi.org/10.7566/JPSCP.8.022013

Journal Articles

Development of single-sided silicon detectors in the emulsion-hybrid system at J-PARC

Lee, J. Y.*; Ekawa, Hiroyuki; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; et al.

JPS Conference Proceedings (Internet), 8, p.021008_1 - 021008_6, 2015/09

https://doi.org/10.7566/JPSCP.8.021008

Journal Articles

Cosmic-ray test of a time-of-flight detector for double-strangeness experiments at J-PARC

Kim, S. H.*; Hwang, S.; Ahn, J. K.*; Ekawa, Hiroyuki; Hayakawa, Shuhei; Hong, B.*; Hosomi, Kenji; Imai, Kenichi; Kim, M. H.*; Lee, J. Y.*; et al.

Nuclear Instruments and Methods in Physics Research A, 795, p.39 - 44, 2015/09

https://doi.org/10.1016/j.nima.2015.05.046
 Times Cited Count：4 Percentile：33.25(Instruments & Instrumentation)

Oral presentation

Current status of double hypernuclear experiment at J-PARC

Ekawa, Hiroyuki; Imai, Kenichi

no journal, , 

no abstracts in English

Oral presentation

Double hypernuclei experiment with hybrid emulsion method (J-PARC E07)

Ekawa, Hiroyuki; Imai, Kenichi

no journal, , 

32 (Records 1-20 displayed on this page)