The First gamma-ray spectroscopic study of -shell hypernucleus, 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

Study of baryon excited states in reactions at J-PARC

Sako, Hiroyuki

JPS Conference Proceedings (Internet), 17, p.063004_1 - 063004_2, 2017/07

https://doi.org/10.7566/JPSCP.17.063004

N*, baryon excited states have been studied for a long time, but many of high mass states have not been found yet. Recent theoretical studies clarified that channels have large contributions to these high mass states. Therefore we have proposed an experiment at J-PARC (E45) to measure reactions. In this presentation, we will show the overview of the experiment and current status of detector developments.

Kaonic-atom X-ray spectroscopy with superconducting microcalorimeters

Hashimoto, Tadashi; Tanida, Kiyoshi; 45 of others*

JPS Conference Proceedings (Internet), 17, p.072001_1 - 072001_4, 2017/07

https://doi.org/10.7566/JPSCP.17.072001

-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

Scattered proton detection system for scattering experiment with the cylindrical scintillating fiber tracker and BGO calorimeters

Nakada, Yoshiyuki; Hasegawa, Shoichi; Hayakawa, Shuhei

no journal, , 

The proton detection system is under construction for the scattering experiment at J-PARC (J-PARC E40) for the purpose of investigating Baryon-Baryon interaction. The E40 experiment is a double-scattering experiment, that is, followed by in the liquid hydrogen () target. Then, the scattering events are identified by tagging the production with spectrometer systems, and by measuring the scattered proton with the proton detection system. The momentum of produced can be calculated from the momenta of and measured by the spectrometer systems. We can reconstruct scattering events using their kinematics. The scattered proton detection system (CATCH: Cylindrical Active Tracker and Calorimeter system for Hyperon scattering) for this experiment is composed of cylindrical scintillating fiber tracker (CFT) and calorimeter of bismuth orthogermanate (BGO) crystals. Enough energy resolution of CFT to separate protons and s is essential for good S/N. The construction of the 2 layer of CFT (CFT-2 and CFT-UV2) was completed. We performed a test experiment at the Cyclotron and Radioisotope Center in Tohoku University to evaluate its performance. proton beams were irradiated to polyethylene () film target, and proton scattering data were acquired. Using the and scattering data, we evaluated proton detection efficiency of CFT-2 and -UV2 and their energy resolution.

Development of PID method in nuclear emulsion

Kimbara, Shinji; Tanida, Kiyoshi

no journal, , 

Our goal is to develop image processing method to identify daughter nucleus decayed from double-hypernuclei. To develop the method, emulsion stack was exposed to one particle with several incident angles from the normal line to the surface of the stack. We will present the result of the PID method applied for particle Z = 15 in nuclear emulsion at RIKEN experiment.