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NSR database version of April 11, 2024.

Search: Author = N.Muramatsu

Found 16 matches.

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2023MU09      Phys.Rev. C 107, L042201 (2023)

N.Muramatsu, for the LEPS2/BGOegg Collaboration

First measurement of differential cross sections and photon beam asymmetries for photoproduction of the f0(980) meson decaying into π0π0 at Eγ < 2.4 GeV

NUCLEAR REACTIONS 1H(polarized γ, p2π0), E=1.3-2.4 GeV; measured invariant mass spectra; deduced differential σ(θ, E), photon beam asymmetries in photoproduction of f0(980) meson decaying into π0π0. Detected all the final-state particles of the reaction γp --> f0(980)p --> π0π0p--> γγγγp. High-resolution electromagnetic calorimeter with 1320 BGO crystals in the BGOegg experiment at the LEPS2 beamline of SPring-8. Relevance to the structure of f0(980) meson.

doi: 10.1103/PhysRevC.107.L042201
Citations: PlumX Metrics


2022IS02      Phys.Rev. C 105, 045201 (2022)

T.Ishikawa, A.Fix, H.Fujimura, H.Fukasawa, R.Hashimoto, Q.He, Y.Honda, T.Iwata, S.Kaida, J.Kasagi, A.Kawano, S.Kuwasaki, K.Maeda, S.Masumoto, M.Miyabe, F.Miyahara, K.Mochizuki, N.Muramatsu, A.Nakamura, K.Nawa, Y.Obara, S.Ogushi, Y.Okada, K.Okamura, Y.Onodera, K.Ozawa, Y.Sakamoto, M.Sato, H.Shimizu, H.Sugai, K.Suzuki, Y.Tajima, S.Takahashi, Y.Taniguchi, Y.Tsuchikawa, H.Yamazaki, R.Yamazaki, H.Y.Yoshida

Coherent photoproduction of the neutral-pion and η-meson on the deuteron at incident energies below 1.15 GeV

NUCLEAR REACTIONS 2H(γ, π0ηd), E<1.15 GeV; measured reaction products, angular distributions, Eγ, Iγ, deuteron spectra, (particle)γ-coin; deduced σ(E), σ(θ, E), ηd scattering parameters, invariant mass. Comparison to other experimental data and model estimations. FOREST setup consisting of three different electromagnetic calorimeters (EMCs): 192 pure cesium iodide (CsI) crystals for the forward EMC, 252 lead scintillating-fiber sandwich modules for the central, and 62 lead-glass Cherenkov counters for the backward. Bremsstrahlung beam from the STretcher Booster (STB) ring synchrotron at the Research Center for Electron Photon Science (ELPH), Tohoku University, Japan.

doi: 10.1103/PhysRevC.105.045201
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2021IS10      Phys.Rev. C 104, L052201 (2021)

T.Ishikawa, H.Fujimura, H.Fukasawa, R.Hashimoto, Q.He, Y.Honda, T.Iwata, S.Kaida, J.Kasagi, A.Kawano, S.Kuwasaki, K.Maeda, S.Masumoto, M.Miyabe, F.Miyahara, K.Mochizuki, N.Muramatsu, A.Nakamura, K.Nawa, Y.Obara, S.Ogushi, Y.Okada, K.Okamura, Y.Onodera, K.Ozawa, Y.Sakamoto, M.Sato, H.Shimizu, H.Sugai, K.Suzuki, Y.Tajima, S.Takahashi, Y.Taniguchi, Y.Tsuchikawa, H.Yamazaki, R.Yamazaki, H.Y.Yoshida

Resonance-like structure near the ηd threshold in the γd → π0ηd reaction

NUCLEAR REACTIONS 2H(γ, π0ηd), E=0.75-1.15 GeV; measured final-state particles, total and differential σ(E) as a function of the incident photon energy, angular distributions for π0 with respect to the photon beam using FOREST detector consisting of three different electromagnetic calorimeters (EMCs) at the Research Center for Electron Photon Science (ELPH), Tohoku University; deduced S-wave resonance states and widths, strong enhancement near the ηd threshold. Comparison with previous experimental data.

doi: 10.1103/PhysRevC.104.L052201
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2020IS04      Phys.Rev. C 101, 052201 (2020)

T.Ishikawa, H.Fujimura, H.Fukasawa, R.Hashimoto, Q.He, Y.Honda, A.Hosaka, T.Iwata, S.Kaida, J.Kasagi, A.Kawano, S.Kuwasaki, K.Maeda, S.Masumoto, M.Miyabe, F.Miyahara, K.Mochizuki, N.Muramatsu, A.Nakamura, S.X.Nakamura, K.Nawa, S.Ogushi, Y.Okada, K.Okamura, Y.Onodera, K.Ozawa, Y.Sakamoto, M.Sato, T.Sato, H.Shimizu, H.Sugai, K.Suzuki, Y.Tajima, S.Takahashi, Y.Taniguchi, Y.Tsuchikawa, H.Yamazaki, R.Yamazaki, H.Y.Yoshida

wN scattering length from w photoproduction on the proton near the reaction threshold

NUCLEAR REACTIONS 1H(γ, ω), E=1.09-1.15 GeV; measured Eγ, Iγ, differential σ(θ), and total σ(Eγ) using the FOREST detector at the Research Center for Electron Photon Science of Tohoku University; deduced scattering parameters, spin-averaged scattering length, and effective range. Comparison with other experimental results and with theoretical predictions.

doi: 10.1103/PhysRevC.101.052201
Citations: PlumX Metrics


2020MU12      Phys.Rev. C 102, 025201 (2020)

N.Muramatsu, for the LEPS2/BGOegg Collaboration

Differential cross sections, photon beam asymmetries, and spin density matrix elements of w photoproduction off the proton at Eγ = 1.3 - 2.4 GeV

NUCLEAR REACTIONS 1H(polarized γ, pω), E=1.3-2.4 GeV; measured charged particles, γ rays produced in the decay of ω meson to π0+γ, and further to γγγ, photon beam asymmetries, differential σ(θ, E) using a large acceptance electromagnetic calorimeter BGOegg of 1320 BGO crystals, and charged-particle detectors at the SPring-8 LEPS2 beamline of Japan Synchrotron Radiation Institute; deduced distributions of π0γ invariant mass, spin density matrix elements. Comparisons with results from earlier experiments by GRAAL, LEPS, LEPS-NTPC, CLAS and CBELSA/TAPS Collaborations, and with partial-wave analysis by the Bonn-Gatchina group.

doi: 10.1103/PhysRevC.102.025201
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2019MU15      Phys.Rev. C 100, 055202 (2019)

N.Muramatsu, LEPS2/BGOegg Collaboration

Measurement of neutral pion photoproduction off the proton with the large acceptance electromagnetic calorimeter BGOegg

NUCLEAR REACTIONS 1H(polarized γ, π0p), E=1.3-2.4 GeV; measured photons, charged particles, differential σ(E, θ(π0)) and photon-beam asymmetries using the large-acceptance electromagnetic calorimeter BGOegg for 2γ photons from the decay of π0 and for the charged particles, the latter identified by inner plastic scintillators (IPS) at the LEPS2 beamline of SPring-8 synchrotron at Japan Synchrotron Radiation Research Institute. Comparison with previous experimental results from CLAS, CBELSA/TAPS, GRAAL, LEPS, Daresbury, CEA and Yerevan collaborations, and with partial wave analysis (PWA) model calculations.

doi: 10.1103/PhysRevC.100.055202
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2017IS13      Phys.Lett. B 772, 398 (2017)

T.Ishikawa, H.Fujimura, H.Fukasawa, R.Hashimoto, Q.He, Y.Honda, T.Iwata, S.Kaida, H.Kanda, J.Kasagi, A.Kawano, S.Kuwasaki, K.Maeda, S.Masumoto, M.Miyabe, F.Miyahara, K.Mochizuki, N.Muramatsu, A.Nakamura, K.Nawa, S.Ogushi, Y.Okada, K.Okamura, Y.Onodera, K.Ozawa, Y.Sakamoto, M.Sato, H.Shimizu, H.Sugai, K.Suzuki, Y.Tajima, Y.Taniguchi, Y.Tsuchikawa, H.Yamazaki, R.Yamazaki, H.Y.Yoshida

First measurement of coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV

NUCLEAR REACTIONS 2H(γ, π0), E<0.9 GeV; measured reaction products; deduced total σ. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2017.04.010
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2544.


2017IS14      Acta Phys.Pol. B48, 1801 (2017)

T.Ishikawa, K.Aoki, H.Fujioka, Y.Honda, T.Hotta, Y.Inoue, K.Itahashi, H.Kanda, H.Kawai, K.Maeda, Y.Matsumura, M.Miyabe, S.Miyata, N.Muramatsu, T.Nishi, H.Ohnishi, K.Ozawa, H.Shimizu, R.Shirai, M.Tabata, A.O.Tokiyasu, Y.Tsuchikawa, H.Yamazaki

Low-energy Scattering Parameters Between the eta Meson and Nucleon from eta Photoproduction on the Deuteron

NUCLEAR REACTIONS 2H(γ, nη), E=0.82-1.26 GeV; analyzed recoil η momentum vs incident bremsstrahlung Eγ; deduced η-n scattering length. More results in near future.

doi: 10.5506/APhysPolB.48.1801
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2009NA02      Phys.Rev. C 79, 025210 (2009)

T.Nakano, N.Muramatsu, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, S.Fukui, H.Hasegawa, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, Y.Kato, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsuda, N.Matsuoka, T.Matsumura, T.Mibe, M.Miyabe, Y.Miyachi, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, P.M.Shagin, Y.Shiino, A.Shimizu, H.Shimizu, Y.Sugaya, M.Sumihama, Y.Toi, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers

Evidence for theΘ+ in the γd → K+K- pn reaction by detecting K+K- pairs

doi: 10.1103/PhysRevC.79.025210
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2008NI10      Phys.Rev. C 78, 035202 (2008)

M.Niiyama, H.Fujimura, D.S.Ahn, J.K.Ahn, S.Ajimura, H.C.Bhang, T.H.Chang, W.C.Chang, J.Y.Chen, S.Date, S.Fukui, H.Funahashi, K.Hicks, K.Horie, T.Hotta, K.Imai, T.Ishikawa, Y.Kato, K.Kino, H.Kohri, S.Makino, T.Matsumura, T.Mibe, K.Miwa, M.Miyabe, N.Muramatsu, M.Nakamura, T.Nakano, Y.Nakatsugawa, Y.Ohashi, D.S.Oshuev, J.D.Parker, N.Saito, T.Sawada, Y.Sugaya, M.Sumihama, J.L.Tang, M.Uchida, C.W.Wang, T.Yorita, M.Yosoi

Photoproduction of Λ(1405) and Σ0(1385) on the proton at Eγ=1.5-2.4 GeV

NUCLEAR REACTIONS 1H(γ, K+)Λ/Σ, E=1.5-2.4 GeV; measured σ.

doi: 10.1103/PhysRevC.78.035202
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2007SU23      Phys.Lett. B 657, 32 (2007)

M.Sumihama, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsumura, N.Matsuoka, T.Mibe, M.Miyabe, Y.Miyachi, M.Morita, N.Muramatsu, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, H.Ohkuma, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, T.Sato, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yosoi, R.G.T.Zegers

Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5-2.4 GeV

NUCLEAR REACTIONS 1H(polarized γ, π0), E=1.5-2.4 GeV; measured missing mass spectra, σ(E, θ), beam asymmetry.

doi: 10.1016/j.physletb.2007.10.032
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetK2114.


2005IS02      Phys.Lett. B 608, 215 (2005)

T.Ishikawa, D.S.Ahn, J.K.Ahn, H.Akimune, W.C.Chang, S.Date, H.Fujimura, M.Fujiwara, K.Hicks, T.Hotta, K.Imai, H.Kawai, K.Kino, H.Kohri, T.Matsumura, T.Mibe, K.Miwa, M.Miyabe, M.Morita, T.Murakami, N.Muramatsu, H.Nakamura, M.Nakamura, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, T.Ooba, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, Y.Shiino, Y.Sakemi, H.Shimizu, Y.Sugaya, M.Sumihama, Y.Toi, H.Toyokawa, C.W.Wang, T.Yorita, M.Yosoi, R.G.T.Zegers

φ photo-production from Li, C, Al, and Cu nuclei at Eγ = 1.5-2.4 GeV

NUCLEAR REACTIONS Li, C, Al, Cu(γ, X), E=1.5-2.4 GeV; measured kaon pair invariant mass spectra, φ mesons photoproduction σ; deduced target mass dependence, φ-nucleon interaction total σ.

doi: 10.1016/j.physletb.2005.01.023
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2003MA65      Nucl.Phys. A721, 723c (2003)

T.Matsumura, H.Kohri, T.Hotta, T.Nakano, T.Mibe, R.G.T.Zegers, M.Fujiwara, N.Muramatsu, T.Ishikawa, M.Miyabe, M.Niiyama, M.Sumihama, H.Nakamura, Y.Sugaya, H.Kawai, T.Ooba, Y.Shiino, P.M.Shagin, K.Hicks, C.Rangacharyulu, S.Date, Y.Ohashi, T.Yorita, Y.Tajima, H.Y.Yoshida, D.Oshuev, J.K.Ahn, J.Kasagi, T.Kinoshita, T.Nakabayashi, H.Yamazaki, H.Shimizu

0 photoproduction experiment at SPring-8

NUCLEAR REACTIONS H, C(γ, 2π0X), E=1.5-2.4 GeV; measured 4γ-cluster events invariant mass spectra.

doi: 10.1016/S0375-9474(03)01166-7
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2003NA08      Phys.Rev.Lett. 91, 012002 (2003)

T.Nakano, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsumura, N.Matsuoka, T.Mibe, K.Miwa, M.Miyabe, Y.Miyachi, M.Morita, N.Muramatsu, M.Niiyama, M.Nomachi, Y.Ohashi, T.Ooba, H.Ohkuma, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, T.Sasaki, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, M.Sumihama, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi, R.G.T.Zegers

Evidence for a Narrow S = +1 Baryon Resonance in Photoproduction from the Neutron

NUCLEAR REACTIONS 12C(γ, K+K-), E ≈ 1.5-2.4 GeV; measured kaon missing mass spectra; deduced baryon resonance features.

doi: 10.1103/PhysRevLett.91.012002
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2003ZE04      Phys.Rev.Lett. 91, 092001 (2003)

R.G.T.Zegers, M.Sumihama, D.S.Ahn, J.K.Ahn, H.Akimune, Y.Asano, W.C.Chang, S.Date, H.Ejiri, H.Fujimura, M.Fujiwara, K.Hicks, T.Hotta, K.Imai, T.Ishikawa, T.Iwata, H.Kawai, Z.Y.Kim, K.Kino, H.Kohri, N.Kumagai, S.Makino, T.Matsumura, N.Matsuoka, T.Mibe, K.Miwa, M.Miyabe, Y.Miyachi, M.Morita, N.Muramatsu, T.Nakano, M.Niiyama, M.Nomachi, Y.Ohashi, T.Ooba, H.Ohkuma, D.S.Oshuev, C.Rangacharyulu, A.Sakaguchi, T.Sasaki, P.M.Shagin, Y.Shiino, H.Shimizu, Y.Sugaya, H.Toyokawa, A.Wakai, C.W.Wang, S.C.Wang, K.Yonehara, T.Yorita, M.Yoshimura, M.Yosoi

Beam-Polarization Asymmetries for the p(γ(pol), K+)Λ and p(γ(pol), K+0 Reactions for Eγ = 1.5-2.4 GeV

NUCLEAR REACTIONS 1H(polarized γ, K+X), E=1.5-2.4 GeV; measured hyperon production associated beam polarization asymmetries. Comparison with model predictions.

doi: 10.1103/PhysRevLett.91.092001
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2001NA15      Nucl.Phys. A684, 71c (2001)

T.Nakano, J.K.Ahn, M.Fujiwara, H.Kohri, N.Matsuoka, T.Mibe, N.Muramatsu, M.Nomachi, H.Shimizu, K.Yonehara, M.Yosoi, T.Yorita, W.C.Chang, C.W.Wang, S.C.Wang, Y.Asano, T.Hotta, Y.Sugaya, R.Zegers, S.Date, N.Kumagai, Y.Ohashi, H.Ohkuma, H.Toyokawa, T.Iwata, M.Miyabe, Y.Miyachi, A.Wakai, K.Imai, T.Ishikawa, M.Miyabe, T.Sasaki, H.Kawai, T.Ooba, Y.Shiino, M.Wada, H.C.Bhang, Z.Y.Kim, A.Sakaguchi, M.Sumihama, K.Hicks, H.Akimune, T.Matsumura, C.Rangacharyulu, S.Makino

Multi-GeV Laser-Electron Photon Project at SPring-8

NUCLEAR REACTIONS 1H(γ, X), E=high; measured particles invariant mass spectra; deduced φ meson production.

doi: 10.1016/S0375-9474(01)00490-0
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