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Journal Articles

Phase transition and domain formation in ferroaxial crystals

Hayashida, Takeshi*; Uemura, Yohei*; Kimura, Kenta*; Matsuoka, Satoshi*; Hagihara, Masato; Hirose, Sakyo*; Morioka, Hitoshi*; Hasegawa, Tatsuo*; Kimura, Tsuyoshi*

Physical Review Materials (Internet), 5(12), p.124409_1 - 124409_10, 2021/12

https://doi.org/10.1103/PhysRevMaterials.5.124409
 Times Cited Count：17 Percentile：80.41(Materials Science, Multidisciplinary)

Journal Articles

Gamma-ray spectroscopy of single $$Lambda$$-hypernuclei at J-PARC; Results and perspective

Koike, Takeshi*; Hasegawa, Shoichi; Hayakawa, Shuhei*; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tamura, Hirokazu; et al.

AIP Conference Proceedings 2130, p.020011_1 - 020011_9, 2019/07

https://doi.org/10.1063/1.5118379
 Times Cited Count：2 Percentile：73.22(Physics, Nuclear)

Journal Articles

Retreat from stress; Rattling in a planar coordination

Suekuni, Koichiro*; Lee, C. H.*; Tanaka, Hiromi*; Nishibori, Eiji*; Nakamura, Atsushi*; Kasai, Hidetaka*; Mori, Hitoshi*; Usui, Hidetomo*; Ochi, Masayuki*; Hasegawa, Takumi*; et al.

Advanced Materials, 30(13), p.1706230_1 - 1706230_6, 2018/03

https://doi.org/10.1002/adma.201706230
 Times Cited Count：51 Percentile：89.35(Chemistry, Multidisciplinary)

Thermoelectric materials for highly efficient devices must satisfy conflicting requirements of high electrical conductivity and low thermal conductivity. In this paper, we studied the crystal structure and phonon dynamics of tetrahedrites (Cu,Zn)$$_{12}$$(Sb,As)$$_{4}$$S$$_{13}$$. The results revealed that the Cu atoms in a planar coordination are rattling, which effectively scatter phonons. These findings provide a new strategy for the development of highly efficient thermoelectric materials with planar coordination.

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

$$gamma$$-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

High statistics $$Sigma p$$ scattering experiment using high intensity pion beams at J-PARC

Miwa, Koji*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Imai, Kenichi; Kondo, Yasuhiro; Naruki, Megumi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; et al.

JPS Conference Proceedings (Internet), 17, p.041002_1 - 041002_6, 2017/07

https://doi.org/10.7566/JPSCP.17.041002

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

Missing-mass spectroscopy with the $$^6$$Li$$(pi^-,K^+)X$$ reaction to search for $$^6_Lambda$$H

Honda, Ryotaro*; Hasegawa, Shoichi; Hayakawa, Shuhei; Hosomi, Kenji; Ichikawa, Yudai; Imai, Kenichi; Nagamiya, Shoji; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; et al.

Physical Review C, 96(1), p.014005_1 - 014005_23, 2017/07

AA2017-0465.pdf:1.08MB

https://doi.org/10.1103/PhysRevC.96.014005
 Times Cited Count：14 Percentile：73.79(Physics, Nuclear)

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

Studies of high density baryon matter with high intensity heavy-ion beams at J-PARC

Sako, Hiroyuki; Harada, Hiroyuki; Sakaguchi, Takao*; Chujo, Tatsuya*; Esumi, Shinichi*; Gunji, Taku*; Hasegawa, Shoichi; Hwang, S.; Ichikawa, Yudai; Imai, Kenichi; et al.

Nuclear Physics A, 956, p.850 - 853, 2016/12

https://doi.org/10.1016/j.nuclphysa.2016.03.030
 Times Cited Count：12 Percentile：65.66(Physics, Nuclear)

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

https://doi.org/10.1103/PhysRevLett.115.222501
 Times Cited Count：67 Percentile：92.61(Physics, Multidisciplinary)

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

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

Searching for the H-Dibaryon in J-PARC with a large acceptance hyperon spectrometer

Han, Y.*; Hasegawa, Shoichi; Ichikawa, Yudai; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; Tanida, Kiyoshi; J-PARC E42 Collaboration*; 23 of others*

JPS Conference Proceedings (Internet), 8, p.021002_1 - 021002_5, 2015/09

https://doi.org/10.7566/JPSCP.8.021002

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

Observation of the "$$K^-pp$$"-like structure in the $$d(pi^+, K^+)$$ reaction at 1.69 GeV/$$c$$

Ichikawa, Yudai; Hasegawa, Shoichi; Hosomi, Kenji; Imai, Kenichi; Sako, Hiroyuki; Sato, Susumu; Sugimura, Hitoshi; 37 of others*

Progress of Theoretical and Experimental Physics (Internet), 2015(2), p.021D01_1 - 021D01_8, 2015/02

https://doi.org/10.1093/ptep/ptv002
 Times Cited Count：68 Percentile：92.75(Physics, Multidisciplinary)

We have observed a "$$K^-pp$$"-like structure in the $$d(pi^+,K^+)$$ reaction at 1.69 GeV/$$c$$. In this reaction a $$Lambda(1405)$$ hyperon resonance is expected to be produced as a doorway to form $$K^-pp$$ through the $$Lambda^*prightarrow K^-pp$$ process. However, most of the $$Lambda(1405)$$ produced would escape from the deuteron without secondary reactions. Therefore, coincidence of high-momentum ($$>$$ 250 MeV/$$c$$) proton(s)at large emission angles ($$39^circ<theta_{rm lab.}<122 circ$$) was requested to enhance the signal-to-background ratio. A broad enhancement in the proton coincidence spectra is observed around the missing mass of 2.27 GeV/$$c^2$$, which corresponds to the $$K^-pp$$ binding energy of 95 $$^{+18}_{-17}$$ (stat.) $$^{+30}_{-21}$$ (syst.) MeV and the width of 162 $$^{+87}_{-45}$$ (stat.) $$^{+66}_{-78}$$ (syst.) MeV.

Journal Articles

Development of a prototype GEM TPC with a gating grid for an H-dibaryon search experiment at J-PARC

Sako, Hiroyuki; Sugimura, Hitoshi; Ahn, J. K.*; Han, Y.*; Hasegawa, Shoichi; Hwang, S. H.*; Ichikawa, Yudai; Imai, Kenichi; Kiuchi, Ryuta*; Ozawa, Kyoichiro; et al.

Nuclear Instruments and Methods in Physics Research A, 763, p.65 - 81, 2014/11

https://doi.org/10.1016/j.nima.2014.06.007
 Times Cited Count：5 Percentile：38.03(Instruments & Instrumentation)

We developed a prototype TPC for an H-dibaryon search experiment at J-PARC. To investigate its performance, we conducted tests with Ar-CH$$_{4}$$ (90:10) and Ar-CF$$_{4}$$ (95:5), where the former is mainly used. The detection efficiency was measured to be 98% at the beam rate up to $$5times10^{5}$$ cps/cm$$^{2}$$, and 90% at the rate of $$3times10^{6}$$ cps/cm$$^{2}$$. Based on the measured horizontal resolution of 0.19-0.46 mm at the drift length of 5-20 cm, the position resolution of better than 0.3 mm is estimated in 1 T magnetic field. The ion backflow fraction was measured to be 5% and reduced up to 3% at the gain of $$1.6times10^{4}$$. The horizontal position distortion due to ion backflow in the gate operation was suppressed within $$pm 0.2$$ mm at the beam rates up to $$5times10^{5}$$ cps/cm$$^{2}$$. On the other hand, the distortion with the gate open was measured to be $$pm2$$ mm. The distortion in the final experiment is estimated to be $$0.3 pm 0.2$$ mm.

65 (Records 1-20 displayed on this page)