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Journal Articles

A $$Sigma p$$ scattering experiment at J-PARC and the analysis status

Nakada, Yoshiyuki*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Nanamura, Takuya*; Naruki, Megumi*; Sako, Hiroyuki; Sato, Susumu; et al.

JPS Conference Proceedings (Internet), 26, p.023024_1 - 023024_5, 2019/11

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), 7 Pages, 2017/05

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

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

Observation of spin-dependent charge symmetry breaking in $$Lambda N$$ interaction; $$gamma$$-ray spectroscopy of $$^4_{Lambda}$$He

Yamamoto, T. O.*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; Kimbara, Shinji; Nakada, Yoshiyuki; Sako, Hiroyuki; et al.

Physical Review Letters, 115(22), p.222501_1 - 222501_5, 2015/11

AA2015-0707.pdf:0.5MB

 Times Cited Count:54 Percentile:92.84(Physics, Multidisciplinary)

Journal Articles

DFT study on the electronic structure and chemical state of americium in an (Am,U) mixed oxide

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Tsuru, Tomohito; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

Journal of Physics and Chemistry of Solids, 74(12), p.1769 - 1774, 2013/12

 Times Cited Count:12 Percentile:53.54(Chemistry, Multidisciplinary)

We investigated the electronic state of a CaF$$_{2}$$-type (Am,U) mixed oxide using the all-electron full potential linear augmented plane wave method and compared it with those of Am$$_{2}$$O$$_{3}$$, AmO$$_{2}$$, UO$$_{2}$$, and La$$_{0.5}$$U$$_{0.5}$$O$$_{2}$$. The valence of Am in the mixed oxide was close to that of Am$$_{2}$$O$$_{3}$$ and the valence of U in the mixed oxide was pentavalent. The electronic structure of AmO$$_{2}$$ was different from that of Am$$_{2}$$O$$_{3}$$, particularly just above the Fermi level. In addition, the electronic states of Am and U in the mixed oxide were similar to those of trivalent Am and pentavalent U oxides. These electronic states reflected the high oxygen potential of AmO$$_{2}$$ and the heightened oxygen potential resulting from the addition of Am to UO$$_{2}$$ and also suggested the occurrence of charge transfer from Am to U in the solid solution process.

Journal Articles

Core-hole effect on XANES and electronic structure of minor actinide dioxides with fluorite structure

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

Journal of Physics and Chemistry of Solids, 73(2), p.209 - 216, 2012/02

 Times Cited Count:21 Percentile:67.53(Chemistry, Multidisciplinary)

The authors investigated theoretically core-hole effects on X-ray absorption near-edge structures (XANES) of Np and Am L$$_{III}$$ in neptunium dioxide (NpO$$_{2}$$) and americium dioxide (AmO$$_{2}$$) with CaF$$_{2}$$-type crystal lattices using the all-electron full-potential linearized augmented plane-wave (FP-LAPW) method. The peak creation mechanism of XANES was shown by examining the electronic structures of these oxides, which indicated that core-hole screening was more marked for AmO$$_{2}$$ than for NpO$$_{2}$$ because of the difference in the charge transfer between these oxides. Furthermore, the results of charge density analysis suggested that the white line was assigned to the quasi-bound state composed of the localized Np d or Am d components and O components, and that the tail structure was created as a result of delocalized standing waves between the Np or Am atoms.

Journal Articles

Calculation of the electronic structure of AmO$$_{2}$$ and Pr$$_{6}$$O$$_{11}$$ for XANES analysis with redox property

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

International Journal of Quantum Chemistry, 109(12), p.2744 - 2752, 2009/05

 Times Cited Count:5 Percentile:35.3(Chemistry, Physical)

no abstracts in English

Oral presentation

First principles calculation of X-ray absorption spectra of Am oxides

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

X-ray absorption spectra of Am oxides; Analysis using the first principles calculation

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

XANES and the electronic structure of actinide oxide

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

XANES and the electronic structure of Am oxides

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

X-ray absorption spectra of Am oxides and the electronic state analysis

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

X-ray absorption spectra of (Am, U) mixed oxide

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

XANES and the electronic state of americium oxides

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

DFT study on electronic states of Am oxides and Am-U mixed oxides

Suzuki, Chikashi; Nishi, Tsuyoshi; Nakada, Masami; Tsuru, Tomohito; Akabori, Mitsuo; Hirata, Masaru; Kaji, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Scattered proton detection system for $$Sigma p$$ 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 $$Sigma p$$ 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, $$pi^{pm} + p rightarrow K^{+} + Sigma^{pm}$$ followed by $$Sigma^{pm} + p rightarrow Sigma^{pm} + p$$ in the liquid hydrogen ($$mathrm{LH_2}$$) target. Then, the $$Sigma p$$ scattering events are identified by tagging the $$Sigma$$ production with spectrometer systems, and by measuring the scattered proton with the proton detection system. The momentum of produced $$Sigma$$ can be calculated from the momenta of $$pi$$ and $$K$$ measured by the spectrometer systems. We can reconstruct $$Sigma p$$ 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 $$pi$$s is essential for good S/N. The construction of the 2 layer of CFT (CFT-$$Phi$$2 and CFT-UV2) was completed. We performed a test experiment at the Cyclotron and Radioisotope Center in Tohoku University to evaluate its performance. $$80~mathrm{MeV}$$ proton beams were irradiated to polyethylene ($$mathrm{CH_2}$$) film target, and proton scattering data were acquired. Using the $$pp$$ and $$pmathrm{C}$$ scattering data, we evaluated proton detection efficiency of CFT-$$Phi$$2 and -UV2 and their energy resolution.

Oral presentation

Evaluation of the energy resolution of the cylindrical fiber tracker for the J-PARC E40 experiment

Nakada, Yoshiyuki; Hasegawa, Shoichi; Hayakawa, Shuhei

no journal, , 

no abstracts in English

Oral presentation

Development of the 3-dim. matrix trigger logic for the J-PARC E40 experiment

Nakada, Yoshiyuki; Hasegawa, Shoichi

no journal, , 

no abstracts in English

Oral presentation

Development of the trigger system using particle flight information for the J-PARC E40 experiment

Nakada, Yoshiyuki; Hasegawa, Shoichi

no journal, , 

A high statistical Sigma proton scattering experiment at J-PARC (J-PARC E40) is under preparation. High intensity $$pi$$ beam of $$10^{7}$$ Hz will be used. It is very important to reject background events from a huge number of hit information including $$pi p to K Sigma$$ reaction events. We are developing a trigger system using complex hit information of counters in front and rear of a magnet. The developing status will be reported in this talk.

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