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Your search keyword '"S. Kinbara"' showing total 6 results
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6 results on '"S. Kinbara"'

1. 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

2. K̄ and nucleus system studied by 12C(K−, p) spectrum

Author

Y. Sasaki, Tomoyuki Hasegawa, Shoichi Hasegawa, Kazuya Kobayashi, Kiyoshi Tanida, Satoru Hirenzaki, Shin Hyung Kim, W. S. Jung, J. Yamagata-Sekihara, Megumi Naruki, Y. Nakada, Alessandro Feliciello, Kotaro Shirotori, Jae-Yong Lee, T. Nanamura, Hiroyuki Ekawa, Koji Miwa, Elena Bottta, S. Kinbara, T. J. Moon, Kenji Hosomi, Hitoshi Sugimura, Yuya Akazawa, Susumu Sato, Petr Evtoukhovitch, Takeshi O. Yamamoto, Manami Fujita, Toshiyuki Takahashi, T. Hayakawa, Toshiyuki Gogami, Jung Keun Ahn, Atsushi Sakaguchi, Kanae Aoki, Shuhei Hayakawa, Manami Nakagawa, Ryotaro Honda, Yudai Ichikawa, S. Marcello, Z. Tsamalaidze, Hiroyuki Sako, Hirokazu Tamura, Shunsuke Kanatsuki, Kenichi Imai, Tomofumi Nagae, and Mifuyu Ukai

Subjects
Physics, Momentum, medicine.anatomical_structure, Imaginary part, Nuclear Theory, Binding energy, Spectrum (functional analysis), medicine, Atomic physics, Nuclear Experiment, Optical potential, Nucleus
Abstract

We have measured an inclusive missing-mass spectrum of the 12 C(K−, p) reaction over wide energy region at the kaon incident momentum of 1.8 GeV/c at J-PARC K1.8 beam line. This measurement was carried out as a by-product of a pilot run of J-PARC E05 experiment, which searched for the Ξ-hypernuclei via 12C(K−, K+) reaction. We have compared the observed missing-mass spectrum with a DWIA calculation to study the K-nucleus interaction. In this comparison, we have changed the depth of both real and imaginary parts of the optical potential between the K and nucleus. It is found that the observed spectrum is best reproduced by the calculation of the potential depth of V0 ∼ −80 MeV (real part) and W0 ∼ −40 MeV (imaginary part). On the other hand, we have observed a definitive excess around the deeply bound region BK ≳ 100 MeV. The excess cannot be explained by the any optical potential and quasi-free background reaction. It is well fitted with a Breit-Wigner function with a binding energy of 90 MeV and a width of 100 MeV, which can be interpreted as a deeply bound Λ(1405) nucleus.

Published
2019

3. Observation of a Ξ bound state in the 12C(K−, K+) reaction at 1.8 GeV/c

Author

S. Marcello, Hirokazu Tamura, Jae-Yong Lee, Shin Hyung Kim, W. S. Jung, Manami Fujita, T. Nanamura, Toshiyuki Gogami, Kazuya Kobayashi, Kenichi Imai, Takeshi O. Yamamoto, Kanae Aoki, Y. Nakada, Y. Sasaki, Tomoyuki Hasegawa, Tomofumi Nagae, Elena Botta, Manami Nakagawa, Yudai Ichikawa, Shoichi Hasegawa, Jung Keun Ahn, Koji Miwa, Shunsuke Kanatsuki, Susumu Sato, Z. Tsamalaidze, Petr Evtoukhovitch, Mifuyu Ukai, Kiyoshi Tanida, Ryotaro Honda, Megumi Naruki, T. J. Moon, Kenji Hosomi, Hitoshi Sugimura, Toshiyuki Takahashi, Shuhei Hayakawa, T. Hayakawa, Hiroyuki Sako, Kotaro Shirotori, Alessandro Feliciello, Hiroyuki Ekawa, Yuya Akazawa, S. Kinbara, and Atsushi Sakaguchi

Subjects
Physics, Spectrum (functional analysis), Bound state, Bond energy, Atomic physics, Nuclear Experiment
Abstract

For the full understanding of baryon-baryon interactions in flavor SU(3), the ΞN interaction is the last missing piece of information. So far, we have revealed the ΛN interaction to be attractive (UΛ ≈ 30 MeV), and ΣN interaction to be repulsive in the medium to heavy mass-number region. The ΛΛ bonding energy is weakly attractive. While we have a few experimental observations suggesting the ΞN interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of Ξ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a 12C(K−, K+) reaction, which strongly suggests the existence of Ξ-hypernuclear bound states, is presented.For the full understanding of baryon-baryon interactions in flavor SU(3), the ΞN interaction is the last missing piece of information. So far, we have revealed the ΛN interaction to be attractive (UΛ ≈ 30 MeV), and ΣN interaction to be repulsive in the medium to heavy mass-number region. The ΛΛ bonding energy is weakly attractive. While we have a few experimental observations suggesting the ΞN interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of Ξ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a 12C(K−, K+) reaction, which strongly suggests the existence of Ξ-hypernuclear bound states, is presented.

Published
2019

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

5. The First Gamma-ray Spectroscopic Study of sd-shell Hypernucleus, \(_{\Lambda }^{19}\text{F}\)

Author

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

Subjects
Physics, Isotopes of lithium, Binding energy, Shell (structure), Gamma ray, Gamma spectroscopy, Atomic physics, Hypernucleus, Spectroscopy, Semiconductor detector
Published
2017

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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