論文 - 松田 洋平
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Low-lying intruder state of the unbound nucleus Be-13 査読あり 国際誌
Y. Kondo, T. Nakamura, Y. Satou, T. Matsumoto, N. Aoi, N. Endo, N. Fukuda, T. Gomi, Y. Hashimoto, M. Ishihara, S. Kawai, M. Kitayama, T. Kobayashi, Y. Matsuda, N. Matsui, T. Motobayashi, T. Nakabayashi, T. Okumura, H. J. Ong, T. K. Onishi, K. Ogata, H. Otsu, H. Sakurai, S. Shimoura, M. Shinohara, T. Sugimoto, S. Takeuchi, M. Tamaki, Y. Togano, Y. Yanagisawa
PHYSICS LETTERS B 690 ( 3 ) 245 - 249 2010年6月
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出版者・発行元：ELSEVIER SCIENCE BV
An experimental study for the unbound nucleus Be-13 has been performed by means of the invariant mass method via the one-neutron removal reaction H-1(Be-14.Be-12 + n). A resonance has been observed at 0.51(1) MeV in the relative energy (E-rel) spectrum of the Be-12+n system. The transverse momentum distribution of the 12Be+n system as well as the resonance width of 0.45(3) MeV gives evidence for the p-wave nature of the resonance. A d-wave resonance has also been observed at 2.39(5) MeV in the E-rel spectrum. The observation of the low-lying p-wave resonance indicates the disappearance of the N= 8 magicity in the vicinity of the neutron drip line region. (c) 2010 Elsevier B.V. All rights reserved.
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One-neutron removal reactions of C-18 and C-19 on a proton target 査読あり 国際誌
Y. Kondo, T. Nakamura, Y. Satou, T. Matsumoto, N. Aoi, N. Endo, N. Fukuda, T. Gomi, Y. Hashimoto, M. Ishihara, S. Kawai, M. Kitayama, T. Kobayashi, Y. Matsuda, N. Matsui, T. Motobayashi, T. Nakabayashi, K. Ogata, T. Okumura, H. J. Ong, T. K. Onishi, H. Otsu, H. Sakurai, S. Shimoura, M. Shinohara, T. Sugimoto, S. Takeuchi, M. Tamaki, Y. Togano, Y. Yanagisawa
PHYSICAL REVIEW C 79 ( 1 ) 014602 2009年1月
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出版者・発行元：AMER PHYSICAL SOC
We have studied the one-neutron removal reactions of C-18 at 81 MeV/nucleon and C-19 at 68 MeV/nucleon on a liquid hydrogen target. Transverse-momentum distributions of the core fragments C-17 and C-18, and their partial cross sections, are measured using coincidences with the. rays. These are compared to theoretical calculations based on the continuum-discretized coupled-channels (CDCC) method. We have found that the transverse-momentum distributions of 17C are well described by the CDCC calculations, and the agreement provides evidence for the spin-parity assignments of J(pi) = 1/2(+) for the 0.21-MeV state and J(pi) = 5/2(+) for the 0.33-MeV state in C-17. The J(pi) = (2, 3)(+) assignment for the 4.0-MeV state in C-18 is obtained for the first time based on the momentum distribution of C-18. The measured partial cross sections are consistent with the CDCC calculations combined with shell-model spectroscopic factors. The present study demonstrates that the transverse-momentum distribution obtained in a one-neutron removal reaction on a proton target is as useful as the conventional longitudinal-momentum distribution measured with the heavier Be or C targets for determining the orbital angular momentum of a removed neutron.
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(p,2p) reactions on 9−16C at 250 MeV/A 査読あり 国際誌
T. Kobayashi, K. Ozeki, K. Watanabe, Y. Matsuda, Y. Seki, T. Shinohara, T. Miki, Y. Naoi, H. Otsu, S. Ishimoto, S. Suzuki, Y. Takahashi, E. Takada
Nuclear Physics A 805 431C - 438C 2008年6月
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Unbound excited states in C-19,C-17 査読あり 国際誌
Y. Satou, T. Nakamura, N. Fukuda, T. Sugimoto, Y. Kondo, N. Matsui, Y. Hashimoto, T. Nakabayashi, T. Okumura, M. Shinohara, T. Motobayashi, Y. Yanagisawa, N. Aoi, S. Takeuchi, T. Gomi, Y. Togano, S. Kawai, H. Sakurai, H. J. Ong, T. K. Onishi, S. Shimoura, M. Tamaki, T. Kobayashi, H. Otsu, Y. Matsuda, N. Endo, M. Kitayama, M. Ishihara
PHYSICS LETTERS B 660 ( 4 ) 320 - 325 2008年2月
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出版者・発行元：ELSEVIER SCIENCE BV
The neutron-rich carbon isotopes C-19,C-17 have been investigated via proton inelastic scattering on a liquid hydrogen target at 70 MeV/nucleon. The invariant mass method in inverse kinematics was employed to reconstruct the energy spectrum, in which fast neutrons and charged fragments were detected in coincidence using a neutron hodoscope and a dipole magnet system. A peak has been observed with an excitation energy of 1.46(10) MeV in C-19, while three peaks with energies of 2.20(3), 3.05(3), and 6.13(9) MeV have been observed in C-17. Deduced cross sections are compared with microscopic DWBA calculations based on p-sd shell model wave functions and modem nucleon-nucleus optical potentials. J(pi) assignments are made for the four observed states as well as the ground states of both nuclei. (C) 2008 Elsevier B.V. All rights reserved.
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Medium effect and neutron density distribution of 16,18O observed via proton elastic scattering 査読あり 国際誌
J. Zenihiro, H. Sakaguchi, T. Murakami, H. Takeda, S. Terashima, Y. Matsuda, M. Yosoi, Y. Yasuda, M. Itoh
Nuclear Physics A 805 ( 805 ) 281 - 283 2008年
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Measurement of the H(38S,p’) reaction at forward angles including 0 degree 査読あり 国際誌
H. Otsu, T. Kobayashi, Y. Matsuda, M. Kitayama, K. Inafuku, A. Ozawa, Y. Satou, T. Suda, K. Yoshida, H. Sakaguchi
Nuclear Physics A 788 266C - 270C 2007年5月
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(p,2p) Reactions on Carbon Isotopes: p(9−16C,2p) 8−15B at 250AMeV 査読あり 国際誌
T. Kobayashi, K. Ozeki, K. Watanabe, Y. Matsuda, Y. Seki, T. Shinohara, T. Miki, Y. Naoi, H. Otsu, S. Ishimoto, S. Suzuki, Y. Takahashi, E. Takada
Proceedings of Tours Symposium on Nuclear Physics VI, Tours, AIP Conference Proceedings 891 108 - + 2007年