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7 results on '"S. Kinbara"'

1. Ξ − atomic X-ray spectroscopy using a counter-emulsion hybrid method

Author

M Fujita, H Ekawa, Y Endo, R Goto, S Hasegawa, S H Hayakawa, K Hayashi, R Honda, K Hoshino, K Hosomi, M Ichikawa, Y Ichikawa, H Ito, Y Ishikawa, W S Jung, A Kasagi, S H Kim, S Kinbara, H Kobayashi, T Koike, J Y Lee, P M Lin, Y Nagase, D Nakashima, K Nakazawa, T Nanamura, N Nishimura, S Nishimura, A N L Nyaw, M Ohashi, H Sako, M K Soe, H Tamura, A M M Theint, K T Tint, Y Toyama, M Ukai, T O Yamamoto, S B Yang, J Yoshida, M Yoshimoto, and D Zhang

Subjects
General Physics and Astronomy
Abstract

Ξ− atomic X-ray spectroscopy is one of the most useful methods for investigation of the Ξ–nucleus strong interaction. Since the X-ray energy is shifted and/or broadened due to the Ξ–nucleus strong interaction compared to those calculated from electromagnetic interaction alone, the measurement of the energy shift, ΔE, and the width, Γ, give us information on the Ξ–nucleus potential. A serious problem in the measurement is the significant background derived from in-flight Ξ− decay. A novel method of identifying stopped Ξ− events using the nuclear emulsion was developed to realize the first Ξ− atomic X-ray spectroscopy experiment as the J-PARC E07 experiment, which also aimed at searching for ΛΛ and Ξ− hypernuclei in the emulsion. The X-rays emitted from Ξ− Br and Ξ− Ag atoms were measured using germanium detectors. No clear peaks were observed in the obtained spectra. However, we succeeded in reducing the background to 1/170 by this method employing coincidence measurements using nuclear emulsion and X-ray detectors.

Published
2022
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2. Observation of Coulomb-Assisted Nuclear Bound State of Ξ−–N14 System

Author

S. Bleser, Hitoshi Sugimura, S H Hayakawa, T. Takeda, T. L. Ma, H. Kanauchi, D. H. Zhang, Junya Yoshida, T. Hayakawa, Z. Zhang, Khin Than Tint, M. Minakawa, M. H. Kim, M. Hirose, T. J. Moon, S. Y. Matsumoto, R. Kiuchi, T. Takahashi, Manami Nakagawa, E. Hayata, Jihwa Lee, Y. Nakada, Hitoshi Tamura, F. Schupp, Hidetaka Kobayashi, Hiroyuki Ekawa, K. Agari, Yudai Ichikawa, M. Ohashi, Kotaro Shirotori, Yoko Endo, B. Bassalleck, A. Kasagi, Satoshi Sato, R. Goto, E. Umezaki, K. Ito, Manabu Moritsu, S. Ashikaga, Yuya Akazawa, Masahiro Yoshimoto, Yoshikazu Ishikawa, K. Miwa, Hiroyuki Sako, Yuki Fujikawa, M. Ichikawa, J. Pochodzalla, S. Y. Ryu, A. T. Moe, Kenichi Imai, Hiroki Ito, Kazuya Watanabe, Takashi Yamamoto, S. H. Hwang, K. Inaba, S. Ozawa, N. Fujioka, S. H. Kim, Hitoshi Takahashi, Erina Hirose, Shoichi Hasegawa, Y. Nagase, R Honda, Seongbae Yang, K. Hicks, S. Hoshino, T. Hashimoto, J. Y. Sohn, T. Akaishi, Yuki Sato, A. N. L. Nyaw, T. Nanamura, Shunsuke Kanatsuki, Y. Toyama, Aye Moh Moh Theint, M. M. Soe, Myint Kyaw Soe, Takeshi Koike, Y Han, J. K. Ahn, Kenji Hosomi, Kensuke Kobayashi, S. Kinbara, K. Hoshino, Megumi Naruki, A. Koshikawa, K. Tanida, C. S. Yoon, Manami Fujita, D. Nakashima, K. Oue, Toyoki Watabe, W. S. Jung, Kazuma Nakazawa, Takayoshi Kawai, Y. Ogura, Mifuyu Ukai, and Kazuhiro Suzuki

Subjects
Physics, Binding energy, Hyperon, General Physics and Astronomy, State (functional analysis), Coupling (probability), 01 natural sciences, 0103 physical sciences, Bound state, Coulomb, Absorption (logic), Atomic physics, 010306 general physics, Energy (signal processing)
Abstract

In an emulsion-counter hybrid experiment performed at J-PARC, a Ξ^{-} absorption event was observed which decayed into twin single-Λ hypernuclei. Kinematic calculations enabled a unique identification of the reaction process as Ξ^{-}+^{14}N→_{Λ}^{10}Be+_{Λ}^{5}He. For the binding energy of the Ξ^{-} hyperon in the Ξ^{-}-^{14}N system a value of 1.27±0.21 MeV was deduced. The energy level of Ξ^{-} is likely a nuclear 1p state which indicates a weak ΞN-ΛΛ coupling.

Published
2021
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3. OUP accepted manuscript

Author

Yuji Ishikawa, T. L. Ma, B. Bassalleck, A. Kasagi, Mifuyu Ukai, Seongbae Yang, S. H. Kim, Yudai Ichikawa, Kenichi Imai, J. K. Ahn, Hiroyuki Ekawa, Takeshi O. Yamamoto, J. Pochodzalla, M. M. Soe, P. M. Lin, M. Ichikawa, K. Miwa, Junya Yoshida, A. N. L. Nyaw, T. Nanamura, T. Takahashi, Z. Zhang, Satoshi Sato, K. Hicks, A. T. Moe, D. H. Zhang, S. Hoshino, Aye Moh Moh Theint, Manami Fujita, Khin Than Tint, Yoko Endo, Y. Han, Myint Kyaw Soe, Hitoshi Tamura, T. Hashimoto, Kazuma Nakazawa, J. Y. Sohn, H. Kanauchi, Hiroyuki Sako, C. S. Yoon, S. H. Hayakawa, Masahiro Yoshimoto, Megumi Naruki, S. Kinbara, K. Hoshino, Hitoshi Takahashi, K. Tanida, Y. Nagase, and S. H. Hwang

Subjects
Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, 010306 general physics, Hypernucleus, 01 natural sciences
Published
2021
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4. First Determination of the Level Structure of an sd -Shell Hypernucleus, FΛ19

Author

Manami Fujita, Manami Nakagawa, S. H. Hwang, Hitoshi Sugimura, T. Hayakawa, N. Ichige, T. J. Moon, K. Tanida, K. Miwa, S. Y. Suzuki, Atsushi Sakaguchi, Shunsuke Kanatsuki, Satoshi Sato, Ryotaro Honda, Takeshi Koike, Tokujiro Yamamoto, Y. Ogura, Hiroyuki Sako, Nobuyuki Chiga, Kanae Aoki, Petr Evtoukhovitch, Kensuke Kobayashi, Hiroyuki Ekawa, T. Takahashi, S. Kinbara, Mifuyu Ukai, Kenji Hosomi, Seongbae Yang, Kotaro Shirotori, Shuhei Hayakawa, S. Suto, Hitoshi Tamura, M. Ikeda, Kenichi Imai, A. Feliciello, Jihwa Lee, Yudai Ichikawa, Yuya Akazawa, Y. Sasaki, Z. Tsamalaidze, S. Ishimoto, S. H. Kim, J. K. Ahn, Y. Togawa, Shoichi Hasegawa, Tomofumi Nagae, Y. Nakada, and Taofeng Wang

Subjects
Physics, 010308 nuclear & particles physics, Theoretical models, Shell (structure), General Physics and Astronomy, Hypernucleus, 01 natural sciences, 0103 physical sciences, Level structure, Atomic physics, 010306 general physics, Ground state, Energy (signal processing), Excitation
Abstract

We report on the first observation of γ rays emitted from an sd-shell hypernucleus, _{Λ}^{19}F. The energy spacing between the ground state doublet, 1/2^{+} and 3/2^{+} states, of _{Λ}^{19}F is determined to be 315.5±0.4(stat)_{-0.5}^{+0.6}(syst) keV by measuring the γ-ray energy of the M1(3/2^{+}→1/2^{+}) transition. In addition, three γ-ray peaks are observed and assigned as E2(5/2^{+}→1/2^{+}), E1(1/2^{-}→1/2^{+}), and E1(1/2^{-}→3/2^{+}) transitions. The excitation energies of the 5/2^{+} and 1/2^{-} states are determined to be 895.2±0.3(stat)±0.5(syst) and 1265.6±1.2(stat)_{-0.5}^{+0.7}(syst) keV, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing s- and p-shell hypernuclear data.

Published
2018
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5. Observation of a Be double-Lambda hypernucleus in the J-PARC E07 experiment

Author

D. H. Zhang, M. Hirose, Hitoshi Takahashi, Takeshi Koike, Shoichi Hasegawa, W. S. Jung, Megumi Naruki, R. Kiuchi, Yuki Fujikawa, M. Ichikawa, E. Umezaki, H. Kanauchi, S. Ashikaga, A. T. Moe, Jae-Yong Lee, Hiroki Ito, Kazuma Nakazawa, Yuji Ishikawa, T. L. Ma, Kiyoshi Tanida, Myint Kyaw Soe, Manami Fujita, S. H. Hwang, Y. Toyama, K. Inaba, Yoko Endo, Shin Hyung Kim, M. Minakawa, Mifuyu Ukai, Y. C. Han, Seongbae Yang, Tadayuki Takahashi, Yoshiro Takahashi, D. Nakashima, Ryotaro Honda, Takeshi O. Yamamoto, K. Oue, Y. Nagase, M. H. Kim, Toyoki Watabe, Khin Than Tint, Hiroyuki Sako, Shuhei Hayakawa, S. Y. Ryu, S. Y. Matsumoto, Shunsuke Kanatsuki, Hidetaka Kobayashi, Manami Nakagawa, T. Akaishi, C. S. Yoon, Masaharu Ieiri, Kotaro Shirotori, K. Ito, Takayoshi Kawai, Susumu Sato, A. Koshikawa, Yuya Akazawa, R. Goto, Z. Zhang, S. Kinbara, K. Watanabe, Y. Ogura, S. Ozawa, Aye Moh Moh Theint, Junya Yoshida, N. Fujioka, J. K. Ahn, A. Iskendir, S. Bleser, A. N. L. Nyaw, T. Nanamura, T. Hashimoto, K. Hoshino, J. Y. Sohn, Manabu Moritsu, Kenichi Imai, K. N. Suzuki, K. Hicks, S. Hoshino, T. Takeda, Y. Sasaki, J. W. Lee, Yudai Ichikawa, M. Ohashi, E. Hayata, Yoshihiro Sato, Hirokazu Tamura, M. M. Soe, Koji Miwa, B. Bassalleck, A. Kasagi, Kenji Hosomi, T. J. Moon, Hitoshi Sugimura, T. Hayakawa, Masahiro Yoshimoto, Hiroyuki Ekawa, Y. Nakada, K. Agari, Josef Pochodzalla, Erina Hirose, Kazuya Kobayashi, and F. Schupp

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Binding energy, Nuclear Theory, Hyperon, General Physics and Astronomy, FOS: Physical sciences, Hypernucleus, Lambda, 01 natural sciences, 0103 physical sciences, Production (computer science), ddc:530, J-PARC, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract

A double-$\Lambda$ hypernucleus, ${}_{\Lambda\Lambda}\mathrm{Be}$, was observed by the J-PARC E07 collaboration in nuclear emulsions tagged by the $(K^{-},K^{+})$ reaction. This event was interpreted as a production and decay of $ {}_{\Lambda\Lambda}^{\;10}\mathrm{Be}$, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$, or ${}_{\Lambda\Lambda}^{\;12}\mathrm{Be}^{*}$ via $\Xi^{-}$ capture in ${}^{16}\mathrm{O}$. By assuming the capture in the atomic 3D state, the binding energy of two $\Lambda$ hyperons$\,$($B_{\Lambda\Lambda}$) of these double-$\Lambda$ hypernuclei are obtained to be $15.05 \pm 0.11\,\mathrm{MeV}$, $19.07 \pm 0.11\,\mathrm{MeV}$, and $13.68 \pm 0.11\,\mathrm{MeV}$, respectively. Based on the kinematic fitting, ${}_{\Lambda\Lambda}^{\;11}\mathrm{Be}$ is the most likely explanation for the observed event., Comment: 11 pages, 3 figures

Published
2018
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6. Observation of Spin-Dependent Charge Symmetry Breaking inΛNInteraction: Gamma-Ray Spectroscopy ofHeΛ4

Author

Shin Hyung Kim, Koji Miwa, Michelangelo Agnello, Nobuyuki Chiga, Tokujiro Yamamoto, S. Ishimoto, Kenji Hosomi, Y. Ogura, Y. Yamamoto, Mifuyu Ukai, Jihwa Lee, K. Tanida, N. Amano, S. H. Hwang, Shunsuke Kanatsuki, Atsushi Sakaguchi, N. Ichige, M. H. Kim, Y. Nakada, Shoichi Hasegawa, Hiroyuki Ekawa, T. J. Moon, S. Suto, T. Takahashi, Y. Sasaki, T. Shiozaki, Seongbae Yang, Hitoshi Sugimura, Manami Nakagawa, T. Hayakawa, Tomofumi Nagae, Yudai Ichikawa, Shuhei Hayakawa, Z. Tsamalaidze, S. Kinbara, Kotaro Shirotori, Yuya Akazawa, Ryotaro Honda, S. Y. Suzuki, Hiroyuki Sako, S. Marcello, M. Ikeda, Hiroyuki Tamura, Sho Nagao, K. Tanabe, Toshiyuki Gogami, Kenichi Imai, A. Feliciello, Manami Fujita, Takeshi Koike, Kanae Aoki, Elena Botta, Susumu Sato, and Petr Evtoukhovitch

Subjects
Physics, Excited state, Binding energy, Bound state, General Physics and Astronomy, Charge (physics), Symmetry breaking, Atomic physics, Hypernucleus, Ground state, Energy (signal processing)
Abstract

The energy spacing between the spin-doublet bound state of _{Λ}^{4}He(1^{+},0^{+}) was determined to be 1406±2±2 keV, by measuring γ rays for the 1^{+}→0^{+} transition with a high efficiency germanium detector array in coincidence with the ^{4}He(K^{-},π^{-})_{Λ}^{4}He reaction at J-PARC. In comparison to the corresponding energy spacing in the mirror hypernucleus _{Λ}^{4}H, the present result clearly indicates the existence of charge symmetry breaking (CSB) in ΛN interaction. By combining the energy spacings with the known ground-state binding energies, it is also found that the CSB effect is large in the 0^{+} ground state but is vanishingly small in the 1^{+} excited state, demonstrating that the ΛN CSB interaction has spin dependence.

Published
2015
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7. The first evidence of a deeply bound state of Xi--14N system

Author

Kazuma Nakazawa, Yoko Endo, S. Fukunaga, Hitoshi Takahashi, S. Ogawa, J. H. Kim, Kazunori Itonaga, Khin Than Tint, S. Kinbara, Kenichi Imai, K. Umehara, S. H. Hwang, K. Hoshino, Myint Kyaw Soe, T. Kanda, H. Shibuya, J. Yoshida, T. Takahashi, M. Kawasaki, Hiroki Ito, C. S. Yoon, Akihiro Mishina, Hidetaka Kobayashi, and T. Sugimura

Subjects
Nuclear physics, Physics, Science research, Bound state, General Physics and Astronomy, Humanities
Abstract

The first evidence of a deeply bound state of Xi−–14N system K. Nakazawa1,∗, Y. Endo1, S. Fukunaga2, K. Hoshino1, S. H. Hwang3, K. Imai3, H. Ito1, K. Itonaga1, T. Kanda1, M. Kawasaki1, J. H. Kim4, S. Kinbara1, H. Kobayashi1, A. Mishina1, S. Ogawa2, H. Shibuya2, T. Sugimura1, M. K. Soe1, H. Takahashi5, T. Takahashi5, K. T. Tint1, K. Umehara1, C. S. Yoon4, and J. Yoshida1 1Physics Department, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan 2Department of Physics, Toho University, Funabashi 274-8510, Japan 3Advanced Science Research Center, JAEA, Tokai 319-1195, Japan 4Department of Physics, Gyeongsang National University, Jinju 660-701, Korea 5Institute of Particle and Nuclear Studies, KEK, Tsukuba 305-0801, Japan ∗E-mail: nakazawa@gifu-u.ac.jp

Published
2015
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