13 results on '"Y. Sakemi"'
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2. Electron beam ion trap for study of fusion reactions in nuclear astrophysics
- Author
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E. E. Donets, Nobuyuki Kudomi, T Sakamoto, Tatsushi Shima, Y Sakemi, E. D. Donets, Takahisa Itahashi, and S. Yoshida
- Subjects
Nuclear physics ,Physics ,History ,Standard solar model ,Ion beam ,Nuclear astrophysics ,Nuclear fusion ,Charged particle beam ,Charged particle ,Beam (structure) ,Computer Science Applications ,Education ,Electron beam ion trap - Abstract
The laboratory condition where charged particle fusion reactions have been done is not exactly the same as that of stellar condition. To probe details of reaction and to test the prediction of standard solar model we need more precise data for charged particle fusion experiments in the laboratories. We propose several experimental approaches to reduce the ambiguity of the estimation of screening potential value which is crucial for obtaining the astrophysical S-factor. Experiment with bare target and bare beam interaction will be done by using proposed Electron Beam Ion Trap apparatus (NARITA).
- Published
- 2004
3. Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pTHadrons at HERMES
- Author
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A. Airapetian, N. Akopov, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, W. Brückner, A. Brüll, H. J. Bulten, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, M. Ferstl, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, M.-A. Funk, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. Guidal, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. Henderson, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. M. Menden, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. Milner, A. Most, V. Muccifora, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, S. F. Pate, S. Potashov, D. H. Potterveld, G. Rakness, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, C. Scarlett, A. Schäfer, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, K. Shibatani, T Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, B. Tipton, M. Tytgat, G. M. Uriuoli, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, J. J. van Hunen, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, E. Volk, W. Wander, J. Wendland, S. E. Williamson, T. Wise, K. Woller, S. Yoneyama, and H. Zohrabian
- Subjects
HERMES experiment ,Physics ,Particle physics ,media_common.quotation_subject ,Hadron ,General Physics and Astronomy ,HERA ,Polarization (waves) ,Deep inelastic scattering ,Asymmetry ,Gluon ,Nuclear physics ,High Energy Physics::Experiment ,Nuclear Experiment ,Storage ring ,media_common - Abstract
We present a measurement of the longitudinal spin asymmetry A|| in photoproduction of pairs of hadrons with high transverse momentum pT. Data were accumulated by the HERMES experiment using a 27.5 GeV polarized positron beam and a polarized hydrogen target internal to the HERA storage ring. For h^+h^- pairs with _(pT)^(h1)>1.5GeV/c and _(pT)^(h2)>1.0GeV/c, the measured asymmetry is A_(||) = -0.28±0.12(stat)±0.02(syst). This negative value is in contrast to the positive asymmetries typically measured in deep inelastic scattering from protons, and is interpreted to arise from a positive gluon polarization.
- Published
- 2000
4. Nuclear effects on R=σL/σT in deep-inelastic scattering
- Author
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K Ackerstaff, A Airapetian, N Akopov, I Akushevich, M Amarian, E.C Aschenauer, H Avakian, R Avakian, A Avetissian, B Bains, C Baumgarten, M Beckmann, S Belostotski, J.E Belz, Th Benisch, S Bernreuther, N Bianchi, J Blouw, H Böttcher, A Borissov, M Bouwhuis, J Brack, S Brauksiepe, B Braun, B Bray, St Brons, W Brückner, A Brüll, E.E.W Bruins, H.J Bulten, G.P Capitani, P Carter, P Chumney, E Cisbani, G.R Court, P.F Dalpiaz, E De Sanctis, D De Schepper, E Devitsin, P.K.A de Witt Huberts, P Di Nezza, M Düren, A Dvoredsky, G Elbakian, J Ely, A Fantoni, A Fechtchenko, M Ferstl, K Fiedler, B.W Filippone, H Fischer, B Fox, J Franz, S Frullani, M.-A Funk, Y Gärber, H Gao, F Garibaldi, G Gavrilov, P Geiger, V Gharibyan, A Golendukhin, G Graw, O Grebeniouk, P.W Green, L.G Greeniaus, C Grosshauser, M Guidal, A Gute, V Gyurjyan, J.P Haas, W Haeberli, J.-O Hansen, M Hartig, D Hasch, O Häusser, F.H Heinsius, R Henderson, M Henoch, R Hertenberger, Y Holler, R.J Holt, W Hoprich, H Ihssen, M Iodice, A Izotov, H.E Jackson, A Jgoun, R Kaiser, E Kinney, M Kirsch, A Kisselev, P Kitching, H Kobayashi, N Koch, K Königsmann, M Kolstein, H Kolster, V Korotkov, W Korsch, V Kozlov, L.H Kramer, V.G Krivokhijine, M Kurisuno, G Kyle, W Lachnit, P Lenisa, W Lorenzon, N.C.R Makins, F.K Martens, J.W Martin, F Masoli, A Mateos, M McAndrew, K McIlhany, R.D McKeown, F Meissner, F Menden, A Metz, N Meyners, O Mikloukho, C.A Miller, M.A Miller, R Milner, A Most, V Muccifora, R Mussa, A Nagaitsev, Yu Naryshkin, A.M Nathan, F Neunreither, J.M Niczyporuk, W.-D Nowak, M Nupieri, T.G O'Neill, R Openshaw, J Ouyang, B.R Owen, V Papavassiliou, S.F Pate, M Pitt, S Potashov, D.H Potterveld, G Rakness, A Reali, R Redwine, A.R Reolon, R Ristinen, K Rith, P Rossi, S Rudnitsky, M Ruh, D Ryckbosch, Y Sakemi, I Savin, C Scarlett, A Schäfer, F Schmidt, H Schmitt, G Schnell, K.P Schüler, A Schwind, J Seibert, T.-A Shibata, K Shibatani, T Shin, V Shutov, C Simani, A Simon, K Sinram, P Slavich, M Spengos, E Steffens, J Stenger, J Stewart, U Stoesslein, M Sutter, H Tallini, S Taroian, A Terkulov, E Thomas, B Tipton, M Tytgat, G.M Urciuoli, J.F.J van den Brand, G van der Steenhoven, R van de Vyver, J.J van Hunen, M.C Vetterli, V Vikhrov, M.G Vincter, J Visser, E Volk, W Wander, J Wendland, S.E Williamson, T Wise, K Woller, S Yoneyama, and H Zohrabian
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Physics ,HERMES experiment ,Nuclear and High Energy Physics ,Particle physics ,010308 nuclear & particles physics ,Scattering ,Sigma ,DESY ,Deep inelastic scattering ,01 natural sciences ,Nuclear physics ,Transverse plane ,Cross section (physics) ,0103 physical sciences ,010306 general physics ,Scaling - Abstract
Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data cover a range in the Bjorken scaling variable x between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2 varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06 and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic scattering cross sections at low x and low Q^2.
- Published
- 2000
5. Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction
- Author
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K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, S. Barrow, C. Baumgarten, M. Beckmann, St. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, St. Brons, W. Brückner, A. Brüll, E. E. W. Bruins, H. J. Bulten, R. V. Cadman, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, P. P. J. Delheij, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B. W. Filippone, H. Fischer, H. T. Fortune, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N. D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, C. Grosshauser, M. G. Guidal, A. Gute, V. Gyurjyan, J. P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F. H. Heinsius, R. S. Henderson, Th. Henkes, M. Henoch, R. Hertenberger, Y. Holler, R. J. Holt, W. Hoprich, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, V. Korotkov, W. Korsch, V. Kozlov, L. H. Kramer, B. Krause, V. G. Krivokhijine, M. Kückes, F. Kümmell, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N. C. R. Makins, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. Meissner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A. M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, V. Papavassiliou, S. F. Pate, M. Pitt, H. R. Poolman, S. Potashov, D. H. Potterveld, B. Povh, G. Rakness, A. Reali, R. Redwine, A. R. Reolon, R. Ristinen, K. Rith, H. Roloff, G. Röper, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, J. Seibert, T.-A. Shibata, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. M. Thiessen, E. Thomas, B. Tipton, A. Trudel, M. Tytgat, G. M. Urciuoli, J. J. van Hunen, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, M. C. Vetterli, V. Vikhrov, M. Vincter, J. Visser, E. Volk, W. Wander, T. P. Welch, S. E. Williamson, T. Wise, T. Wölfel, K. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
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Physics ,HERMES experiment ,Particle physics ,Meson ,010308 nuclear & particles physics ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,Nuclear Theory ,General Physics and Astronomy ,Virtual particle ,01 natural sciences ,Coherence length ,Positron energy ,Nuclear physics ,Deuterium ,Nuclear transparency ,0103 physical sciences ,High Energy Physics::Experiment ,Nuclear Experiment ,010306 general physics ,Nucleon - Abstract
Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q^2>0.4 GeV^2 and positron energy loss ν from 9 to 20 GeV. The ratio of the 14N to 1H cross sections per nucleon, known as the nuclear transparency, was found to decrease with increasing coherence length of quark-antiquark fluctuations of the virtual photon. The data provide clear evidence of the interaction of the quark-antiquark fluctuations with the nuclear medium.
- Published
- 1999
6. Measurements of F meson decays in nuclear matter at KEK-PS
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H. Hamagaki, H. En'yo, Y. Nakada, T. Tabaru, M. Ieiri, T. Miyashita, T. Haseyama, T. Murakami, K. Ozawa, Kazuhiro Tanaka, Yuji Matsuda, T.-A. Shibata, M. Nomachi, J. Chiba, Akira Masaike, Satoshi Mihara, Hirohiko Sato, Y. Sakemi, H. Funahashi, M. Sekimoto, Megumi Naruki, Y. Yoshimura, K. Yagi, H. Kanda, K. Hamada, Osamu Sasaki, S. Yokkaichi, and Masaya Ishino
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Nuclear physics ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Meson ,Nuclear matter ,Normal density - Abstract
The experiment KEK-PS E325 measures decays of the F meson in 12GeV p+A reactions both in the φ → K + K − and the φ → e + e − channels to investigate experimental signatures of mass shift in nuclear matter at normal density. Status of the experiment is presented and the preliminary data are shown.
- Published
- 1998
7. Measurement of the neutron spin structure function g with a polarized 3He internal target
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K. Ackerstaff, A. Airapetian, I. Akushevich, N. Akopov, M. Amarian, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, M. Beckmann, S. Belostotski, J.E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, W. Brückner, A. Brüll, E.E.W. Bruins, H.J. Bulten, G.P. Capitani, P. Carter, E. Cisbani, G.R. Court, P.P.J. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, M. Düren, A. Dvoredsky, G. Elbakian, J. Emerson, A. Fantoni, A. Fechtchenko, M. Ferstl, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, H.T. Fortune, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, P. Galumian, H. Gao, Y. Gärber, F. Garibaldi, P. Geiger, V. Gharibyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, A. Gute, V. Gyurjyan, J.P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, R.S. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, N. Koch, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, V. Kozlov, L.H. Kramer, B. Krause, V.G. Krivokhijine, M. Kückes, G. Kyle, W. Lachnit, W. Lorenzon, A. Lung, N.C.R. Makins, S.I. Manaenkov, F.K. Martens, J.W. Martin, A. Mateos, K. McIlhany, R.D. McKeown, F. Meissner, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R.G. Milner, V. Mitsyn, A. Most, R. Mozzetti, V. Muccifora, A. Nagaitsev, Y. Naryshkin, A.M. Nathan, F. Neunreither, M. Niczyporuk, W.-D. Nowak, M. Nupieri, P. Oelwein, H. Ogami, T.G. O'Neill, R. Openshaw, V. Papavassiliou, S.F. Pate, M. Pitt, S. Potashov, D.H. Potterveld, B. Povh, G. Rakness, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, G. Röper, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, K.P. Schüller, A. Schwind, T.-A. Shibata, T. Shin, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stoesslein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D.M. Thiessen, B. Tipton, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, M.C. Vetterli, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, T. Wölfel, K. Zapfe-Düren, H. Zohrabian, and R. Zurmühle
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Physics ,HERMES experiment ,Nuclear and High Energy Physics ,Range (particle radiation) ,010308 nuclear & particles physics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,HERA ,Spin structure ,Deep inelastic scattering ,01 natural sciences ,Nuclear physics ,Positron ,0103 physical sciences ,High Energy Physics::Experiment ,Neutron ,Atomic physics ,010306 general physics ,Spin-½ - Abstract
Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function g1n(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The data cover the kinematic range 0.023
- Published
- 1997
8. Development of Neutron Polarization Measurement System for Studying NN interaction in Nuclear Medium
- Author
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J. Yasuda, T. Wakasa, M. Dozono, T. Fukunaga, S. Gotanda, K. Hatanaka, Y. Kanaya, Y. Maeda, K. Miki, Y. Nishio, T. Noro, K. Ohnaka, S. Sakaguchi, Y. Sakemi, K. Sekiguchi, A. Tamii, T. Taguchi, and Y. Wada
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Physics ,Nuclear physics ,Spectrometer ,System of measurement ,Nuclear Theory ,Neutron stimulated emission computed tomography ,Astrophysics::Instrumentation and Methods for Astrophysics ,Neutron cross section ,Neutron ,Polarimeter ,Neutron scattering ,Nuclear Experiment ,Polarization (waves) - Abstract
We have developed the neutron polarization measurement system to perform the first polarization-transfer measurement for the exclusive [Formula: see text] reaction. For the neutron polarization measurement, we have reconstructed the neutron polarimeter NPOL3. The NPOL3 system has been calibrated by using the polarized neutron from the [Formula: see text] reaction, and the resulting effective analyzing power is [Formula: see text]. For the exclusive measurement, the Large Acceptance Spectrometer (LAS) has been used for the recoil proton detection. The energy resolution of 6 MeV is achieved for separation energy, which is sufficient to separate the [Formula: see text] and [Formula: see text] orbits for light nuclei.
- Published
- 2016
9. High-precision (p, t) Reactions to Determine Reaction Rates in the Stellar rp-process
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G. P. A. Berg, Y. Fujita, T. Adachi, A. M. van den Berg, H. Fujita, K. Fujita, J. Görres, M. N. Harakeh, K. Hatanaka, A. Matic, S. O’Brien, Y. Sakemi, Y. Shimbara, Y. Shimizu, R. Talwar, Y. Tameshige, A. Tamii, T. Wakasa, M. Wiescher, M. Yosoi, Isao Tanihara, Hooi Jin Ong, Atsushi Tamii, Tadafumi Kishimoto, Toshitaka Kajino, Shigeru Kubono, and Tatsushi Shima
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Nuclear physics ,Physics ,Reaction rate ,Neutron star ,Isotope ,Spectrometer ,White dwarf ,Astrophysics ,rp-process ,Stellar evolution ,Spectral line - Abstract
The main source of uncertainties in stellar rate calculations of the rp‐process and the competing αp‐process is often the lack of knowledge of the resonance states above the p‐ and α‐thresholds and their precise energies. We have started a program to study these resonances in proton‐rich unstable nuclei via the (p, t) and other neutron‐pickup reactions using the high resolution spectrometer Grand Raiden. Here, we are presenting the status of the project and recent results of the 25Al(P, γ) reaction rates based on the analysis of measured 28Si(p, t)26Si spectra.
- Published
- 2010
10. High-resolution study of [sup 37]Cl→[sup 37]Ar Gamow-Teller transition via [sup 37]Cl([sup 3]He, t)[sup 37]Ar reaction
- Author
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Y. Shimbara, Y. Fujita, T. Adachi, G. P. A. Berg, B. A. Brown, H. Fujimura, H. Fujita, K. Fujita, K. Hara, K. Y. Hara, K. Hatanaka, J. Kamiya, K. Katori, T. Kawabata, K. Nakanishi, G. Martìnez-Pinedo, N. Sakamoto, Y. Sakemi, Y. Shimizu, T. Tameshige, M. Uchida, M. Yoshifuku, M. Yosoi, R. G. T. Zegers, Isao Tanihara, Hooi Jin Ong, Atsushi Tamii, Tadafumi Kishimoto, Toshitaka Kajino, Shigeru Kubono, and Tatsushi Shima
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Nuclear reaction ,Nuclear physics ,Physics ,Solar neutrino ,Isospin ,Nuclear Theory ,Elementary particle ,Neutrino ,Atomic physics ,Nucleon ,Radioactive decay ,Lepton - Abstract
We performed a 37Cl(3He, t)37Ar experiment at E = 140 MeV/nucleon and 0° with a resolution of 30 keV. The Gamow‐Teller (GT) strength distribution was obtained up to the excitation energy (Ex) of 14.2 MeV in 37Ar. Under the assumption of isospin symmetry, the GT strengths in the 37Cl→37Ar and 37Ca→37K transitions are analogous. The obtained strength distribution was compared with the mirror 37Ca β decay up to Ex = 8.6 MeV. The overall shapes of the distributions were similar, but the details were not necessary the same. In order to understand those differences, the experimental distribution was compared with the shell model (SM) calculation using the USD interaction. The SM calculation suggests that differences at lower energies can be caused by a large tensor contribution in the charge‐exchange reaction. On the other hand, the differences seen at higher energies are due to the breaking of the mirror symmetry. The neutrino cross section for the 8B solar neutrino source was calculated using the obtained data.
- Published
- 2010
11. High-Resolution B(GT) studies with ([sup 3]He,t) reactions
- Author
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C. Scholl, Y. Fujita, T. Adachi, H. Hashimoto, K. Hatanaka, H. Matsubara, K. Nakanishi, T. Ohta, Y. Sakemi, Y. Shimbara, Y. Shimizu, Y. Tameshige, A. Tamii, P. von Brentano, M. Yosoi, R. G. T. Zegers, Jan Jolie, Andreas Zilges, Nigel Warr, and Andrey Blazhev
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Physics ,Nuclear physics ,Early results ,Spectrometer ,Ab initio quantum chemistry methods ,Double beta decay ,Momentum transfer ,Nuclear structure ,High resolution ,Atomic physics ,Charge exchange - Abstract
It has been shown that the (3He,t) charge exchange reaction at intermediate energies, used at zero momentum transfer in combination with high‐resolution magnetic spectrometers is a very powerful probe for Gamow‐Teller strengths. Several N = Z nuclei such as 46V [1] or 50Mn [2] have been investigated. Recently ab‐initio nuclear structure calculations have become possible for light nuclei. Thus experimental studies on light nuclei have become of great current interest [3]. We review previous results obtained in 11C with respect to nuclear structure aspects and the Hoyle state, and present some early results of a 9Be(3He,t)9B experiment carried out recently, pointing out the significance of high‐resolution charge‐exchange reactions and the investigation of Gamow‐Teller strengths for the understanding of nuclear structure in light nuclei.
- Published
- 2009
12. Study of [sup 12]C(p⃗,n⃗)[sup 12]N(g.s.;1[sup +]) at 296 MeV and Nuclear Correlation Effects
- Author
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M. Dozono, T. Wakasa, E. Ihara, S. Asaji, K. Fujita, K. Hatanaka, T. Ishida, T. Kaneda, H. Matsubara, Y. Nagasue, T. Noro, Y. Sakemi, Y. Shimizu, H. Takeda, Y. Tameshige, A. Tamii, Y. Yamada, Donald G. Crabb, Yelena Prok, Matt Poelker, Simonetta Liuti, Donal B. Day, and Xiaochao Zheng
- Subjects
Nuclear physics ,Physics ,Baryon ,Nuclear reaction ,Meson ,Nuclear Theory ,Hadron ,Neutron ,Elementary particle ,Atomic physics ,Nuclear Experiment ,Nucleon ,Random phase approximation - Abstract
We present measurements of the cross section and a complete set of polarization observables for the Gamow‐Teller 12C(p,n)12N(g.s.;1+) reaction at an incident proton energy of 296 MeV. The complete set of polarization observables is used to separate the cross section into spin‐longitudinal and spin‐transverse components. From the comparison with the distorted wave impulse approximation calculations employing random phase approximation response functions, we found that our data showed the existence of the pionic and rho‐mesonic correlations in nuclei.
- Published
- 2009
13. Focal plane polarimeter for the grand raiden at RCNP
- Author
-
H. Akimune, O. Kamigaito, S. Toyama, S. Hirata, M. Fujiwara, Tomohiko Takahashi, M. Yoshimura, Y. Sakemi, A. Yamagoshi, T. Inomata, I. Daito, H. Sakaguchi, Tetsuo Noro, M. Yosoi, A. Tamii, and M. Kawabata
- Subjects
Nuclear physics ,Elastic scattering ,Physics ,Proton ,Spectrometer ,Scattering ,Dipole magnet ,Polarimeter ,Nuclear Experiment ,Rotation ,Spin-½ - Abstract
A large focal‐plane polarimeter which uses inclusive scattering from carbon has been installed for the high resolution spectrometer ‘Grand Raiden’ at RCNP. A fast second‐level trigger system can reject events with small scattering angles. A special dipole magnet is added to the final stage of the spectrometer in order to rotate the spin direction. High resolution measurements of all spin observables for proton scattering are now able to be made with high efficiency over a broad energy range. The present system has been checked by the measurement of spin rotation parameters in proton elastic scattering at 300 MeV.
- Published
- 1995
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