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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

 Times Cited Count:13 Percentile:85.21(Physics, Multidisciplinary)

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.

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, , 

Oral presentation

Present status of emulsion experiments

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Double hypernuclei search experiment with hybrid emulsion method

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Double hypernuclei search experiment with hybrid emulsion method, 2

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Experimental study of double hypernuclei at J-PARC

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Experimental study of double hypernuclei with a hybrid emulsion method at J-PARC

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Double hypernuclei search experiment with hybrid emulsion method, 3

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

Status of J-PARC E07; Systematic study of double strangeness nuclei with hybrid emulsion method

Yoshida, Junya

no journal, , 

J-PARC E07 is a unique experiment at J-PARC to investigate double strangeness nuclei with hybrid emulsion method. It was designed to obtain ten times more double strangeness nuclei than that obtained by previous experiments. Moreover, it aims the first measurement of X-ray from $${Xi}$$-atom by Germanium detector. Beam exposure of E07 and photographic development of emulsion sheets are successfully completed. Several double strangeness events are found through searching work. I will report the present status, analysis of detected events, and the prospect of the experiment.

Oral presentation

J-PARC E07, systematic study of doublestrangeness nuclei with hybrid emulsion method

Yoshida, Junya

no journal, , 

J-PARC E07 is a unique experiment at J-PARC to investigate double hypernuclei with the hybrid emulsion method. It is designed to detect 10 times higher statistics of double hypernuclei compared to the past experiments. Moreover, this experiment aims the first measurement of X-ray from Xi-atom by a Germanium detector array. These experimental data will provide essential information on Lambda-Lambda and Xi-nucleon interactions. Beam exposure of J-PARC E07 has been completed in 2017 with 118 emulsion modules containing 1.5k emulsion sheets. Photographic developing of all emulsion sheets has been completed. These emulsion sheets are presently being analyzed with dedicated microscope systems. About 10 double hypernuclear events have been observed in nearly ten percent of total statistics as of June 2018. I will report the latest information about our experiment: status of searching work, analysis of found events, and the prospect of the analysis.

Oral presentation

Analysis of a $$_{LambdaLambda}mathrm{Be}$$ double hypernucleus observed in the J-PARC E07 experiment

Sako, Hiroyuki; Ekawa, Hiroyuki

no journal, , 

no abstracts in English

Oral presentation

J-PARC E07; Systematic study of double strangeness system with hybrid emulsion method

Yoshida, Junya

no journal, , 

J-PARC E07 is an experiment aimed at studying double strangeness (S=-2) system induced by nuclear capture of $$Xi^-$$ in photographic emulsion sheets. Double strangeness systems such as double $$Lambda$$ hypernuclei, $$Xi$$ hypernuclei, and $$Xi$$ hyperatoms are important subjects to understand the $$LambdaLambda$$ and $$Xi N$$ interactions. Nearly 30 events of S=-2 events has been detected through the analysis, so far. Among them, an event named MINO was identified as $$_{LambdaLambda}$$Be. Furthermore, several candidates of $$Xi$$ hypernucleus are detected. An event named IBUKI was identified as $$^{15}_Xi$$C. We also aim to measure X-rays from $$Xi$$ hyperatoms which are formed after the capture of $$Xi^-$$ hyperons by Ag or Br nuclei in the emulsion sheets. The scanning of the emulsion sheets is ongoing. This work will be completed within a few years.

Oral presentation

Experimental study of double hypernuclei at J-PARC

Yoshida, Junya

no journal, , 

Double $$Lambda$$ hypernuclei and $$Xi$$ hypernuclei, collectively called "double hypernuclei", have come to play important roles in hadron nuclear physics as valuable information sources of baryon-baryon interaction. The most effective method to investigate them is event-by-event analysis with photographic emulsion sheets. An emulsion experiment to detect double hypernuclei has been performed in the J-PARC hadron facility in 2016-17. By this experiment, quantitative data on $$LambdaLambda$$ or $$Xi N$$ interaction in a nucleus are being accumulated successfully. A new nuclide of double hypernucleus, $$_{LambdaLambda}$$Be, was observed. Several other interesting events have been found and further event search is going on.

Oral presentation

Production of Double-Lambda hypernuclei at JPARC

Yoshida, Junya

no journal, , 

J-PARC E07, the largest experiment with Double Lambda hypernucleus thus far at J-PARC was designed and performed. Double $$Lambda$$ hypernuclei, rare nuclei containing 2 Lambda particles is one of the important subjects in modern hadron nuclear physics. The experiment is unique in that photographic emulsion sheets are employed as the main detector for Double $$Lambda$$ hypernuclei. We performed the physics-run in the J-PARC hadron facility in 2016-17. One of the observed events was identified as a beryllium 11 double Lambda. We measured the strength of Lambda-Lambda interaction through the event. Moreover, we detected several $$Xi$$ hypernuclei events which suggest multiple bound levels of $$Xi$$ particle in the nucleus. Further event search is ongoing.

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