論文 - 前田 幸重
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Hatanaka K., Shimizu Y., Hirooka D., Kamiya J., Kitamura Y., Maeda Y., Noro T., Obayashi E., Sagara K., Saito T., Sakai H., Sakemi Y., Sekiguchi K., Tamii A., Wakasa T., Yagita T., Yako K., Yoshida H., Ladygin V., Kamada H., Glöckle W., Golak J., Nogga A., Witała H.
Physical Review C - Nuclear Physics 66 ( 4 ) 440021 - 4400210 2002年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
The angular distributions of the cross section, the proton analyzing power, and all proton polarization transfer coefficients of p→d elastic scattering were measured at 250 MeV. The range of center-of-mass angles was 10°-165° for the cross section and the analyzing power, and about 10°-95° for the polarization transfer coefficients. These are the first measurements of a complete set of proton polarization observables for p→d elastic scattering at intermediate energies. The present data are compared with theoretical predictions based on exact solutions of the three-nucleon Faddeev equations and modern realistic nucleon-nucleon potentials combined with three-nucleon forces (3NF), namely, the Tucson-Melbourne (TM) 2π-exchange model, a modification thereof (TM′) closer to chiral symmetry, and the Urbana IX model. Large effects of the three-nucleon forces are predicted. The inclusion of the three-nucleon forces gives a good description of the cross section at angles below the minimum. However, appreciable discrepancies between the data and predictions remain at backward angles. For the spin observables the predictions of rise TM 3NF model deviate strongly from the other two 3NF models, which are close together, except for Kyy′. In the case of the analyzing power all 3NF models fail to describe the data at the upper half of the angular range. In the restricted measured angular range the polarization transfer coefficients are fairly well described by the TM′ and Urbana IX 3NF models, whereas the TM 3NF model mostly fails. The transfer coefficient Kyy′ is best described by the Urbana IX but the theoretical description is still insufficient to reproduce the experimental data. These results call for a better understanding of the spin structure of the three-nucleon force and very likely for a full relativistic treatment of the three-nucleon continuum.
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Production of thick and highly uniform CD2 targets for \vec{n}+d measurements 査読あり
Y. Maeda, H. Sakai, K. Hatanaka, A. Tamii
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 490 518 - 521 2002年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Uesaka T., Nishikawa J., Okamura H., Suda K., Sakai H., Tamii A., Sekiguchi K., Yako K., Sakoda S., Kato H., Hatano M., Maeda Y., Saito T., Uchigashima N., Sakamoto N., Satou Y., Ohnishi T., Wakui T., Wakasa T., Itoh K.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 533 ( 1-2 ) 1 - 7 2002年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Cross section, tensor analyzing power T20, and vector polarization correlation coefficient Cy,y for the 3He(d, p)4He reaction have been measured at 0° and Ed = 140, 200, and 270 MeV. The data are compared with a calculation based on an impulse approximation taking the D-state admixtures in deuteron, 3He, and 4He explicitly into account. The reasonable agreement with the data is understood as a consequence of a close connection between the 3He(d, p)4He reaction and the d + N backward scattering. © 2002 Elsevier Science B.V. All rights reserved.
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Search for narrow dibaryon resonances by the pd→pdX and pd→ppX reactions
Tamii A., Hatanaka K., Hatano M., Hirooka D., Kamiya J., Kato H., Maeda Y., Saito T., Sakai H., Sakoda S., Sekiguchi K., Uchigashima N., Uesaka T., Wakasa T., Yako K.
Physical Review C - Nuclear Physics 65 ( 4 ) 470011 - 470014 2002年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the pd→pdX and pd→ppX reactions at Ep - 300 MeV. Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a γ ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the d + γ or p + n + γ decay channels within the mass region of 1896-1914 MeV. Upper limits for the dibaryon production cross section are presented.
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Sekiguchi K., Sakai H., Sakai H., Witała H., Witała H., Glöckle W., Golak J., Golak J., Hatano M., Kamada H., Kato H., Maeda Y., Nishikawa J., Nogga A., Ohnishi T., Okamura H., Sakamoto N., Sakoda S., Satou Y., Suda K., Tamii A., Uesaka T., Wakasa T., Yako K.
Physical Review C - Nuclear Physics 65 ( 3 ) 340031 - 3400316 2002年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
Precise measurements of deuteron vector and tensor analyzing powers Ayd, Axx, Ayy, and Axz in d-p elastic scattering were performed via 1H(d→,d)p and 1H(d→,p)d reactions at three incoming deuteron energies of Edlab = 140, 200, and 270 MeV. A wide range of center-of-mass angles from ≈ 10° to 180° was covered. The cross section was measured at 140 and 270 MeV at the same angles. These high precision data were compared with theoretical predictions based on exact solutions of three-nucleon Faddeev equations and modern nucleon-nucleon potentials combined with three-nucleon forces. Three-body interactions representing a wide range of present day models have been used: the Tucson-Melbourne 2 π-exchange model, a modification thereof closer to chiral symmetry, the Urbana IX model, and a phenomenological spin-orbit ansatz. Large three-nucleon force effects are predicted, especially at the two higher energies. However, only some of them, predominantly dσ/dΩ and Ayd, are supported by the present data. For tensor analyzing powers the predicted effects are in drastic conflict to the data, indicating defects of the present day three-nucleon force models.
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[Formula Presented] reactions in the [Formula Presented] resonance region
Hatanaka K., Kamiya J., Hirooka D., Maeda Y., Maeda Y., Noro T., Obayashi E., Okamura H., Sakai H., Tamii A., Tamura K., Wakasa T., Yako K., Yoshida H.
Physical Review C - Nuclear Physics 65 ( 1 ) 2002年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
The role of the Δ resonance has been discussed for the [Formula Presented] reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state [Formula Presented] reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for [Formula Presented] reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the [Formula Presented] reaction are compared with full-range distorted-wave Born approximation calculations. © 2001 The American Physical Society.
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Hatanaka K., Kamiya J., Hirooka D., Maeda Y., Maeda Y., Noro T., Obayashi E., Okamura H., Sakai H., Tamii A., Tamura K., Wakasa T., Yako K., Yoshida H.
Physical Review C - Nuclear Physics 65 ( 1 ) 146091 - 146095 2002年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
The role of the Δ resonance has been discussed for the 12,13,14C(p, π-)13,14,15Og.s. reactions both experimentally and theoretically. Recent calculations suggested resonance effects in the energy dependence of the differential cross section that seem to contradict existing data. Since the available data points are limited, it is important to measure the energy dependence of the differential cross sections and the analyzing powers in order to better understand the still unclear reaction mechanism of the ground state (p, π-) reactions. In the present paper, angular distributions of the differential cross sections and the analyzing powers were measured for 12,13C(p, π±) reactions at incident energies of 250, 300, and 350 MeV. Experimental results for the 12C(p, π-)13Og.s. reaction are compared with full-range distorted-wave Born approximation calculations.
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Search for narrow dibaryon resonances by the [Formula Presented] and [Formula Presented] reactions 査読あり
Tamii A., Hatanaka K., Hatano M., Hirooka D., Kamiya J., Kato H., Maeda Y., Saito T., Sakai H., Sakoda S., Sekiguchi K., Uchigashima N., Uesaka T., Wakasa T., Yako K.
Physical Review C - Nuclear Physics 65 ( 4 ) 2002年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review C - Nuclear Physics
Nucleon-nucleon decoupled dibaryons below the pion emission threshold have been investigated by the [Formula Presented] and [Formula Presented] reactions at [Formula Presented] Such dibaryons are predicted to either decay into a deuteron or two nucleons by emitting a [Formula Presented] ray and consequently have a very narrow width of less than 1 keV. The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A mass resolution of 0.95 MeV and background-free condition have been achieved. No resonance was found in either the [Formula Presented] or [Formula Presented] decay channels within the mass region of 1896–1914 MeV. Upper limits for the dibaryon production cross section are presented. © 2002 The American Physical Society.
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d→p and n→d scatterings at intermediate energy and three-nucleon force effects
Sakai H., Maeda Y., Sekiguchi K., Glöckle W., Greenfield M., Hatanaka K., Hatano M., Hirooka D., Kamada H., Kamiya J., Kato H., Ohnishi T., Okamura H., Rapaport J., Saito T., Sakamoto N., Sakoda S., Satou Y., Suda K., Tamii A., Uchigashima N., Uesaka T., Wakasa T., Witała H., Yako K.
Nuclear Physics A 689 ( 1-2 ) 353 - 356 2001年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Nuclear Physics A
Precise data on cross sections, analyzing powers and polarization transfer coefficients are measured for the dp elastic scattering at 270 MeV (135 MeV/nucleon) and compared to Faddeev calculations assuming the nd scattering with modern nucleon-nucleon (NN) forces including the 2π exchange Tucson-Melbourne (TM) three-nucleon (3N) force. Excellent fits are obtained for the cross sections and vector analyzing powers when the 3N force is included, while the fits are deteriorated for the tensor analyzing powers if the 3N force is included. A moderate fit is obtained for the polarization transfer coefficients. Based on theses results, one can conclude that the size of amplitudes of the TM-SN force may be adequate but the spin dependent part may be deficient. The cross sections and the vector analyzing powers for the nd elastic scattering at 250 MeV are measured for the first time. Backward cross sections are underestimated by the NN+3N force Faddeev calculations. This difference might be attributed to relativistic effects.
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<sup>3</sup>He(d→,p)<sup>4</sup>He reaction at intermediate energies 査読あり
Uesaka T., Sakai H., Okamura H., Tamii A., Satou Y., Ohnishi T., Sekiguchi K., Yako K., Suda K., Sakoda S., Nishikawa J., Hatano M., Kato H., Maeda Y., Sakamoto N., Wakasa T., Itoh K.
Nuclear Physics A 684 ( 1-4 ) 606 - 608 2001年3月
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Yako K., Sakai H., Tamii A., Sekiguchi K., Sakoda S., Maeda Y., Hatano M., Kato H., Okamura H., Suda K., Greenfield M., Wakasa T., Kamiya J., Hirooka D., Hatanaka K.
Nuclear Physics A 684 ( 1-4 ) 563 - 565 2001年3月
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Polarization transfer measurements for dp scattering at 270 MeV 査読あり
Sakai H., Sekiguchi K., Kato H., Hatano M., Maeda Y., Ohnishi T., Okamura H., Sakamoto N., Sakoda S., Satou Y., Suda K., Tamii A., Uesaka T., Wakasa T., Yako K.
Nuclear Physics A 684 ( 1-4 ) 577 - 579 2001年3月
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Sekiguchi K., Sakai H., Okamura H., Sakamoto N., Tamii A., Uesaka T., Wakasa T., Satou Y., Ohnishi T., Yako K., Sakoda S., Suda K., Kato H., Maeda Y., Hatano M., Nishikawa J.
Nuclear Physics A 684 ( 1-4 ) 574 - 576 2001年3月
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Precise measurement of dp elastic scattering at 270 mev and three-nucleon force effects 査読あり
Sakai H., Sekiguchi K., Witała H., Glöckle W., Hatano M., Kamada H., Kato H., Maeda Y., Nogga A., Ohnishi T., Okamura H., Sakamoto N., Sakoda S., Satou Y., Suda K., Tamii A., Uesaka T., Wakasa T., Yako K.
Physical Review Letters 84 ( 23 ) 5288 - 5291 2000年
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review Letters
The cross section, the deuteron vector Ady and tensor analyzing powers Aij, the polarization transfer coefficients Ky'ij, and the induced polarization Py' were measured for the dp elastic scattering at 270 MeV. The cross section and Ady are well reproduced by Faddeev calculations with modern data-equivalent nucleon-nucleon forces plus the Tucson-Melbourne three-nucleon force. In contrast, Aij, Ky'ij, or Py' are not described by such calculations. These facts indicate the deficiencies in the spin dependence of the Tucson-Melbourne force and call for extended three-nucleon force models. © 2000 The American Physical Society.