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115 results on '"Y. Sakemi"'

1. An accelerator experiment for junior and senior high school students to improve students’ involvement in fundamental physics

Author

K S Tanaka, K Harada, T Hayamizu, R Kita, R Kono, K Maruta, H Nagahama, N Ozawa, Y Sakemi, and R Sugimori

Subjects
Accelerator Physics (physics.acc-ph), Physics Education (physics.ed-ph), Atomic Physics (physics.atom-ph), Physics - Physics Education, FOS: Physical sciences, General Physics and Astronomy, Physics - Accelerator Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics - Atomic Physics, Education
Abstract

In Japan, research activities by junior and senior high school students show an upward trend. However, there are limited examples of research activities in the field of elementary particles and atoms. This is due to the difficulty associated with procuring research tools such as accelerators or particle detectors. Therefore, we hosted the "Accel Kitchen" in 2018 and 2019 at Cyclotron and Radioisotope Center (CYRIC) in Tohoku University where junior and senior high school students could participate in ongoing research of particle and atomic physics. At each workshop, 12 junior and senior high school students participated in the beam experiment, including the production of francium atoms (Fr) by the fusion reaction of oxygen and gold, optimizing the transport of the ion beam and identifying the alpha decay nuclei, and laser trapping of Fr for two days. Each group that was involved in the experiment was supported by researchers and university students who acted as mentors. This was the first opportunity for junior and senior high school students to know about the particle beam experiment in Japan., Comment: 8 pages, 18 figure

Published
2022

2. Development of a Laser Frequency Stabilization and an Optical Transmission System for the Francium Electric Dipole Moment Search

Author

K Nakamura, S Nagase, T Nakashita, T Hayamizu, T Aoki, H Nagahama, N Ozawa, M Sato, K Yamane, M Fukase, D Uehara, A Takamine, and Y Sakemi

Subjects
History, Computer Science Applications, Education
Abstract

We developed a laser frequency stabilization and an optical fiber transmission system for the the francium electric dipole moment search. The absolute accuracy of a laser frequency stabilization scheme using a state-of-the-art commercial wavelength meter was 0.48 MHz at ±2 nm and -1.33 MHz at ±200 nm from calibration wavelength, respectively, and the frequency instability is below 10-9 with a standard deviation of 0.56 MHz over 60 hours. We also demonstrated that a 400 m long fiber laid between laboratories can transmit 30 mW of trapping laser light, which is sufficient for a magneto-optical trapping of francium. The polarization crosstalk in the fiber was stable at -25 dB over 12 hours of measurement.

Published
2022

3. Cross sections and analyzing powers for ( p⃗,np ) reactions of H2, Li6 , and C12 at 296 MeV

Author

T. Wakasa, J. Yasuda, M. Dozono, T. Fukunaga, S. Gotanda, K. Hatanaka, K. Ishibashi, Y. Kanaya, S. Kimura, Y. Maeda, Y. Nishio, T. Noro, T. Nozoe, K. Ohnaka, S. Sakaguchi, Y. Sakemi, K. Sekiguchi, T. Taguchi, and Y. Wada

Subjects
Physics, 010308 nuclear & particles physics, Mass reduction, Nuclear Theory, P versus NP problem, Free space, 01 natural sciences, symbols.namesake, Pauli exclusion principle, 0103 physical sciences, symbols, Neutron detection, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Relativistic quantum chemistry
Abstract

We report measurements of cross sections and analyzing powers for nucleon-knockout $(\stackrel{P\vec}{p},np)$ reactions of $^{2}\mathrm{H}, ^{6}\mathrm{Li}$, and $^{12}\mathrm{C}$ at 296 MeV using the RCNP NPOL3 neutron detector and large acceptance spectrometer. The $1s$ and $1p$ knockout reactions were successfully separated with a separation-energy resolution of approximately 6 MeV. The resulting data were compared with plane-wave and distorted-wave impulse approximation calculations employing the nucleon-nucleon $t$ matrix in free space. No significant differences were identified in the case of the present analyzing power data, in contrast to the significant reductions observed in $(\stackrel{P\vec}{p},2p)$ values. The conventional Pauli blocking and nuclear binding effects with the $g$ matrix and the relativistic effect of nucleon mass reduction in the nuclei are also discussed.

Published
2017

4. Laser frequency locking with 46 GHz offset using an electro-optic modulator for magneto-optical trapping of francium atoms

Author

K. Harada, T. Aoki, S. Ezure, K. Kato, T. Hayamizu, H. Kawamura, T. Inoue, H. Arikawa, T. Ishikawa, A. Uchiyama, K. Sakamoto, S. Ito, M. Itoh, S. Ando, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, Y. Shimizu, T. Sato, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Subjects
Atomic Physics (physics.atom-ph), Materials Science (miscellaneous), FOS: Physical sciences, Beat (acoustics), chemistry.chemical_element, Physics::Optics, Trapping, 01 natural sciences, Industrial and Manufacturing Engineering, Francium, law.invention, Physics - Atomic Physics, 010309 optics, symbols.namesake, Optics, law, 0103 physical sciences, Frequency offset, Physics::Atomic Physics, Business and International Management, 010306 general physics, Physics, Sideband, business.industry, Electro-optic modulator, Laser, chemistry, symbols, Atomic physics, business, Doppler effect
Abstract

We demonstrated a frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The frequency locking error signal was successfully obtained by performing delayed self-homodyne detection of the beat signal between the repumping frequency and the 10th-order sideband component of the trapping light. Sweeping the trapping-light and repumping-light frequencies with keeping its frequency difference of 46 GHz was confirmed over 1 GHz by monitoring the Doppler absorption profile of I2. This technique enables us to search for a resonance frequency of magneto-optical trapping of Fr., 6 pages, 6 figures

Published
2016

5. Frequencies of PRNP gene polymorphisms in Vietnamese dairy cattle for potential association with BSE

Author

Motohiro Horiuchi, Y. Sakemi, K. Suzuki, Yasukazu Muramatsu, T. Ogawa, M. Kanameda, T. T. Hanh, and Yutaka Tamura

Subjects
Genotype, Prions, Epidemiology, animal diseases, Bovine spongiform encephalopathy, Biology, PRNP, Gene Frequency, Polymorphism (computer science), mental disorders, medicine, Animals, Allele, Promoter Regions, Genetic, Indel, Allele frequency, Dairy cattle, Genetics, Polymorphism, Genetic, General Veterinary, General Immunology and Microbiology, Public Health, Environmental and Occupational Health, food and beverages, Sequence Analysis, DNA, medicine.disease, Virology, nervous system diseases, Encephalopathy, Bovine Spongiform, Infectious Diseases, Vietnam, Cattle
Abstract

Summary Since 2004, significant associations between bovine spongiform encephalopathy (BSE) susceptibility in cattle and frequencies of insertion/deletion (ins/del; indel) polymorphisms within the bovine prion protein gene (PRNP) have been reported. In this study, we investigated the frequencies of indel polymorphisms within two variable sites, a 23-bp indel polymorphism in the promoter region (23indel) and a 12-bp indel polymorphism in intron 1 region (12indel), in the PRNP in 206 Vietnamese dairy cattle and seven Japanese BSE-affected cattle. In Vietnamese dairy cattle, the frequency distributions of del allele and del/del genotypic polymorphisms in the 23indel site, which are thought to be associated with BSE susceptibility, were significantly higher, whereas the frequencies of del allelic and del/del genotypic polymorphisms in the 12indel site, which have been reported to confer BSE susceptibility, were significantly lower. We have provided evidence that Vietnamese dairy cattle have a unique genetic background in the PRNP gene in comparison with cattle or sires previously reported in other countries.

Published
2008

6. Towards the Measurement of the Electric-Dipole Moment of Radioactive Francium using Laser-Cooling and Trapping Techniques

Author

Hirokazu Kawamura, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, A. Uchiyama, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Subjects
Physics, Nuclear physics, Electric dipole moment, chemistry, Laser cooling, chemistry.chemical_element, Trapping, Francium
Published
2015

8. Nonquenched Isoscalar Spin-M1 Excitations in sd-Shell Nuclei

Author

H, Matsubara, A, Tamii, H, Nakada, T, Adachi, J, Carter, M, Dozono, H, Fujita, K, Fujita, Y, Fujita, K, Hatanaka, W, Horiuchi, M, Itoh, T, Kawabata, S, Kuroita, Y, Maeda, P, Navrátil, P, von Neumann-Cosel, R, Neveling, H, Okamura, L, Popescu, I, Poltoratska, A, Richter, B, Rubio, H, Sakaguchi, S, Sakaguchi, Y, Sakemi, Y, Sasamoto, Y, Shimbara, Y, Shimizu, F D, Smit, K, Suda, Y, Tameshige, H, Tokieda, Y, Yamada, M, Yosoi, and J, Zenihiro

Abstract

Differential cross sections of isoscalar and isovector spin-M1 (0(+)→1(+)) transitions are measured using high-energy-resolution proton inelastic scattering at E(p)=295 MeV on (24)Mg, (28)Si, (32)S, and (36)Ar at 0°-14°. The squared spin-M1 nuclear transition matrix elements are deduced from the measured differential cross sections by applying empirically determined unit cross sections based on the assumption of isospin symmetry. The ratios of the squared nuclear matrix elements accumulated up to E(x)=16 MeV compared to a shell-model prediction are 1.01(9) for isoscalar and 0.61(6) for isovector spin-M1 transitions, respectively. Thus, no quenching is observed for isoscalar spin-M1 transitions, while the matrix elements for isovector spin-M1 transitions are quenched by an amount comparable with the analogous Gamow-Teller transitions on those target nuclei.

Published
2014

9. Electron beam ion trap for study of fusion reactions in nuclear astrophysics

Author

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

10. The HERMES dual-radiator ring imaging Cherenkov detector

Author

N Akopov, E.C Aschenauer, K Bailey, S Bernreuther, N Bianchi, G.P Capitani, P Carter, E Cisbani, R De Leo, E De Sanctis, D De Schepper, V Djordjadze, B.W Filippone, S Frullani, F Garibaldi, J.-O Hansen, B Hommez, M Iodice, H.E Jackson, P Jung, R Kaiser, J Kanesaka, R Kowalczyk, L Lagamba, A Maas, V Muccifora, E Nappi, K Negodaeva, W.-D Nowak, T O'Connor, T.G O'Neill, D.H Potterveld, D Ryckbosch, Y Sakemi, F Sato, A Schwind, T.-A Shibata, K Suetsugu, E Thomas, M Tytgat, G.M Urciuoli, K Van de Kerckhove, R Van de Vyver, S Yoneyama, H Zohrabian, and L.F Zhang

Subjects
HERMES experiment, Physics, Nuclear and High Energy Physics, Photomultiplier, Physics - Instrumentation and Detectors, Spectrometer, Physics::Instrumentation and Detectors, business.industry, Detector, FOS: Physical sciences, DESY, Instrumentation and Detectors (physics.ins-det), Particle identification, Optics, Electromagnetic shielding, Radiator (engine cooling), High Energy Physics::Experiment, business, Instrumentation
Abstract

The construction and use of a dual radiator Ring Imaging Cerenkov(RICH) detector is described. This instrument was developed for the HERMES experiment at DESY which emphasizes measurements of semi-inclusive deep-inelastic scattering. It provides particle identification for pions, kaons, and protons in the momentum range from 2 to 15 GeV, which is essential to these studies. The instrument uses two radiators, C4F10, a heavy fluorocarbon gas, and a wall of silica aerogel tiles. The use of aerogel in a RICH detector has only recently become possible with the development of clear, large homogeneous and hydrophobic aerogel. A lightweight mirror was constructed using a newly perfected technique to make resin-coated carbon-fiber surfaces of optical quality. The photon detector consists of 1934 photomultiplier tubes for each detector half, held in a soft steel matrix to provide shielding against the residual field of the main spectrometer magnet., 25 pages, 23 figures

Published
2002

11. Further improvement of the upper limit on the direct 3α decay from the Hoyle state in 12C

Author

M, Itoh, S, Ando, T, Aoki, H, Arikawa, S, Ezure, K, Harada, T, Hayamizu, T, Inoue, T, Ishikawa, K, Kato, H, Kawamura, Y, Sakemi, and A, Uchiyama

Abstract

The direct 3α decay branch from the 02+ state at Ex=7.65 MeV in 12C, which is known as the Hoyle state, is considered to affect the triple-α reaction rate strongly and to give crucial information on its structure. We have performed a high-precision measurement of the 3α decay from this state using the 12C(12C,3α)12C reaction at E12C=110 MeV. The branching ratio of the direct 3α decay was under the detection limit in the present experiment. By comparing with Monte Carlo simulations for three decay mechanisms as the sequential decay through the ground state of ^{8}Be, the direct decay with equal energies of three α particles, and the direct decay to the phase space uniformly, we have obtained the upper limit of 0.2% on the direct 3α decay.

Published
2014

12. Search for a permanent EDM using laser cooled radioactive atom

Author

Hirokazu Kawamura, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. S. Nataraj, T. Sato, A. Uchiyama, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Subjects
Physics, Condensed Matter::Quantum Gases, Orders of magnitude (temperature), QC1-999, chemistry.chemical_element, Trapping, Electron, Laser, Francium, law.invention, Rubidium, chemistry, law, Atom, Moment (physics), Physics::Atomic Physics, Atomic physics
Abstract

The search for the electric-dipole moment (EDM) of laser-cooled francium (Fr) atoms could lead to a measurement for the electron EDM. It is predicted that the electron EDM would be enhanced by approximately three orders of magnitude in heavy atoms such as Fr. Laser-cooling and trapping techniques are expected to suppress statistical and systematic errors in precision measurements. The magneto-optical trap was achieved using stable rubidium in a developing factory of laser-cooled radioactive atoms. In light of the results from the rubidium experiments, we found that an upgrade of each apparatus is preferred for Fr trapping.

Published
2014

13. Development of francium atomic beam for the search of the electron electric dipole moment

Author

Tomoya Sato, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H. S. Nataraj, A. Uchiyama, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Subjects
Physics, Atomic beam, Ion beam, QC1-999, chemistry.chemical_element, Thermal ionization, Orthotropic material, Electron electric dipole moment, Francium, chemistry, Thermal, Physics::Atomic and Molecular Clusters, Development (differential geometry), Physics::Atomic Physics, Atomic physics
Abstract

For the measurement of the electron electric dipole moment using Fr atoms, a Fr ion-atom conversion is one of the most critical process. An ion-atom converter based on the "orthotropic" type of Fr source has been developed. This converter is able to convert a few keV Fr ion beam to a thermal atomic beam using a cycle of the surface ionization and neutralization. In this article, the development of the converter is reported.

Published
2014

14. Measurement of the Spin Asymmetry in the Photoproduction of Pairs of High-pTHadrons at HERMES

Author

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

15. Nuclear effects on R=σL/σT in deep-inelastic scattering

Author

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

Subjects
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

16. Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction

Author

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

Subjects
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

17. Measurement of the proton spin structure function g(1)(p) with a pure hydrogen target

Author

A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E.C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, St. Belostotski, E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, St. Brons, W. Brückner, A. Brüll, H.J. Bulten, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dalpiaz, R. De Leo, 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, D. Fick, K. Fiedler, B.W. Filippone, H. Fischer, B. Fox, S. Frabetti, J. Franz, S. Frullani, M.-A. Funk, N.D. Gagunashvili, 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. Guidal, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, F.H. Heinsius, 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, V.G. Krivokhijine, F. Kümmell, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N.C.R. Makins, S.I. Manaenkov, K. Martens, J.W. Martin, H. Marukyan, 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, V. Mitsyn, A. Most, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A.M. Nathan, F. Neunreither, W.-D. Nowak, T.G. O'Neill, B.R. Owen, J. Ouyang, V. Papavassiliou, S.F. Pate, S. Potashov, D.H. Potterveld, G. Rakness, A. Reali, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, H. Roloff, 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, K. Shibatani, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, P. Slavich, M. Spengos, E. Steffens, J. Stenger, J. Stewart, U. Stößlein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, B. Tipton, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, J.J. van Hunen, M.C. Vetterli, M. Vincter, J. Visser, E. Volk, W. Wander, S.E. Williamson, T. Wise, K. Woller, S. Yoneyama, H. Zohrabian, and (Astro)-Particles Physics

Subjects
Nuclear and High Energy Physics, Particle physics, POLARIZATION, Hydrogen, Positron beam, FOS: Physical sciences, chemistry.chemical_element, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), DEUTERON STRUCTURE FUNCTIONS, 0103 physical sciences, Proton spin crisis, Nuclear Experiment, 010306 general physics, Physics, DEEP-INELASTIC-SCATTERING, Range (particle radiation), F-2(P), 010308 nuclear & particles physics, Scattering, Structure function, HERA, 3. Good health, chemistry, Physics::Accelerator Physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Atomic physics, Storage ring
Abstract

A measurement of the proton spin structure function g1p(x,Q^2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron beam at HERA incident on a longitudinally polarised pure hydrogen gas target internal to the storage ring. The kinematic range is 0.021, Comment: 7 pages, 3 figures, 1 table, RevTeX latex

Published
1998

18. Measurements of F meson decays in nuclear matter at KEK-PS

Author

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

Subjects
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

19. The PHENIX experiment at RHIC

Author

D.P. Morrison, Y. Akiba, O. Alford, M. Allen, W. Allen, G. Alley, Y. Arai, J.B. Archuleta, J.R. Archuleta, S.H. Aronson, I. Statekin, D. Autrey, T.C. Awes, C. Barlag, J. Barrette, B. Bassalleck, S. Bathe, Y. Batygin, V. Baublis, A. Bazilevsky, R. Begay, J. Behrendt, S. Belikov, S. Bellavia, S. Belyaev, M.J. Bennett, Y. Berdnikov, J. Bernardin, D.D. Bluhm, C. Blume, E.M. Bohne, J.G. Boissevain, E. Bosze, J. Bowers, J. Branning, C.L. Britton, M.L. Brooks, W.L. Bryan, D. Bucher, H. Buesching, V. Bumazhnov, G. Bunce, S. Butsyk, M. Cafferty, T.A. Carey, P. Chand, J. Chang, W.-C. Chang, R. Chappell, S.K. Charagi, L.L. Chavez, S. Chernichenko, C.-Y. Chi, J. Chiba, A. Chikanian, R.K. Choudhury, M.S. Chung, V. Cianciolo, D. Clark, A. Claussen, S. Coe, B. Cole, R. Conway, L. Cope, D. Crook, H. Cunitz, R. Cunningham, S.Q. Daniel, G. David, A. Denisov, E.J. Desmond, O. Dietzsch, B.V. Dinesh, S. Durrant, A. Durum, D. Dutta, Y.V. Efremenko, S. Eiseman, M.S. Emery, K. Enosawa, H. En'yo, M.N. Ericson, V. Evseev, J. Ferriera, D.E. Fields, K. Filimonov, S. Fokin, D. Fong, Z. Fraenkel, S.S. Frank, A.D. Frawley, J. Fried, S.Y. Fung, D. Gan, J. Gannon, S. Gavin, T.F. Gee, B. Gim, Y. Goto, S.V. Greene, S.K. Gupta, W. Guryn, H.-A. Gustafsson, Y. Gutnikov, J.S. Haggerty, S. Hahn, J.W. Halliwell, H. Hamagaki, H. Hara, J. Harder, A. Harvey, K. Hatanaka, R. Hayano, N. Hayashi, H. Hayashi, R. Hazel, X.C. He, H.W. van Hecke, N. Heine, S. Held, T.K. Hemmick, M. Hibino, J.S. Hicks, R. Higuchi, J.C. Hill, T. Hirano, R. Holmes, B. Hong, R. Hutter, T. Ichihara, M. Ikeno, K. Imai, M. Inaba, M. Ippolitov, M. Ishihara, T. Ishikawa, Y. Iwata, B. Jacak, G. Jackson, C. Jacobs, D. Jaffe, U. Jagadish, G. James, B.M. Johnson, J.W. Johnson, S. Johnson, R.G. Jones, J.P. Jones, S. Kahn, Y.A. Kamyshkov, A. Kandasamy, M. Kaneta, J.H. Kang, M. Kann, S.S. Kapoor, J. Kapustinsky, K. Karadjev, T. Katayama, S. Kato, T. Kawaguchi, W.L. Kehoe, M.A. Kelley, M. Kennedy, E.J. Kennedy, A. Khanzadeev, A. Khomoutnikov, J. Kikuchi, S.Y. Kim, Y.G. Kim, W.W. Kinnison, P.N. Kirk, E. Kistenev, A. Kiyomichi, S. Klinksiek, C. Knapp, L. Kochenda, V.I. Kochetkov, T. Kohama, B. Komkov, V. Kozlov, T. Kozlowski, P.J. Kroon, L. Kudin, S. Kumar, M. Kurata, V. Kuriatkov, K. Kurita, G.S. Kyle, J.G. Lajoie, A. Landran, A. Lebedev, V. Lebedev, D.M. Lee, K.S. Lee, S.J. Lee, M.J. Leitch, Q. Li, Z. Li, M. Libkind, S.X. Lin, R. Lind, X. Liu, J. Lowe, C.F. Maguire, Y.I. Makdisi, A. Makeev, V.V. Makeev, V. Manko, Y. Mao, L.J. Marek, S.K. Mark, D. Markushin, R. Martin, M. Marx, A. Masaike, T. Matsumoto, K. McCabe, J. McClelland, P.L. McGaughey, R. McGrath, D.E. McMillan, J.A. Mead, E. Melnikov, Y. Miake, N. Miftakhov, T.J. Miller, A. Milov, K. Minuzzo, J.T. Mitchell, Y. Miyamoto, O. Miyamura, A.K. Mohanty, M. Montag, J.A. Moore, C. Morris, L.J. Morrison, C. Moscone, J.M. Moss, S.T. Mulhall, L. Mullins, M.M. Murray, M.S. Musrock, S. Nagamiya, Y. Nagasaka, J.L. Nagle, Y. Nakada, T. Nayak, J.A. Negrin, L. Nikkinen, S. Nikolaev, P. Nilsson, S. Nishimura, J.W. Noe, A. Nianine, F. Obenshain, E. O'Brien, P. O'Connor, H. Ohnishi, I.D. Ojha, M. Okamura, V. Onuchin, A. Oskarsson, L. Osterman, I. Otterlund, K. Oyama, L. Paffrath, R. Palmer, C. Pancake, V. Pantuev, V. Papavassiliou, J.H. Park, B. Pasmantirer, S.F. Pate, A. Patwa, P. Paul, C. Pearson, T. Peitzmann, V. Penumetcha, V. Perevoztchikov, R. Petersen, G. Petitt, A. Petridis, R.P. Pisani, P. Pitukhin, F. Plasil, M. Pollack, K. Pope, A. Posey, R. Prigl, M.L. Purschke, Y. Qi, D.E. Quigley, S. Rankowitz, G.S. Rao, I. Ravinovich, K. Read, K. Reygers, Y. Riabov, V. Riabov, G. Richardson, S.H. Robinson, J. Romanski, M. Rosati, E. Roschin, A.A. Rose, S.S. Ryu, N. Saito, T. Sakaguchi, A. Sakaguchi, Y. Sakemi, H. Sako, T. Sakuma, S. Salomone, V. Samsonov, C. Sangster, R. Santo, O. Sasaki, H.D. Sato, S. Sato, H. Satoh, H. Schlagheck, B.R. Schlei, R. Schleuter, J. Schmidt, V. Semenov, R. Seto, T.K. Shea, I. Shein, V. Shelikhov, T.-A. Shibata, K. Shigaki, T. Shiina, T. Shimada, I. Sibiriak, K.S. Sim, J. Simon-Gillo, M.L. Simpson, C.P. Singh, V. Singh, F.W. Sippach, H.D. Skank, G.A. Sleege, N. Smirnov, D.E. Smith, G. Smith, M.C. Smith, R. Smith, W. Smith, K. Soderstrom, S. Soeding, A. Soldatov, G. Solodov, W.E. Sondheim, S.P. Sorensen, P.W. Stankus, N. Starinski, E. Stenlund, D. Stueken, W. Stokes, S.P. Stoll, R. Stotzer, T. Sugitate, J.P. Sullivan, Y. Sumi, Z. Sun, T. Svensson, E.M. Takagui, Y. Takahashi, Y. Takata, A. Taketani, K.H. Tanaka, Y. Tanaka, E. Taniguchi, M.J. Tannenbaum, V. Tarakanov, O. Tarasenkova, O. Teodorescu, S. Teruhi, J. Thomas, J.L. Thomas, T.L. Thomas, W.D. Thomas, W. Tian, T. Tominaka, S. Tonse, H. Torii, A. Trivedi, I. Tserruya, A. Tsvetkov, S.K. Tuli, K. Tung, G.W. Turner, N. Tyurin, B. Uppiliappan, S. Urasawa, A. Usachev, H. Uto, C. Vaa, R.I. Vandermolen, A. Vasiliev, T. Vercelli, W. Verhoeven, A. Vinogradov, V. Vishnevskii, R. Vogt, M. Volkov, A. Vorobyov, E. Vznuzdaev, N. Wagner, J.W. Walker, Z.-F. Wang, Y. Watanabe, X. Wei, S.N. White, D. Whitehouse, V. Williamson, A.L. Wintenberg, C. Witzig, F.K. Wohn, D.M. Wolfe, B.G. Wong-Swanson, W. Wong, C.L. Woody, J. Writt, H. Wu, M. Xiao, G. Xu, K. Yagi, R. Yamamoto, Y. Ye, A. Yokoro, Y. Yokota, G.R. Young, W.A. Zajc, L. Zhang, S. Zhou, Q. Zhu, and C. Zou

Subjects
Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), FOS: Physical sciences, Nuclear Experiment (nucl-ex), PHENIX detector, Nuclear Experiment, High Energy Physics - Experiment
Abstract

The physics emphases of the PHENIX collaboration and the design and current status of the PHENIX detector are discussed. The plan of the collaboration for making the most effective use of the available luminosity in the first years of RHIC operation is also presented., Comment: 5 pages, 1 figure. Further details of the PHENIX physics program available at http://www.rhic.bnl.gov/phenix/

Published
1998

20. The HERMES spectrometer

Author

K. Ackerstaff, A. Airapetian, N. Akopov, M. Amarian, V. Andreev, E.C. Aschenauer, R. Avakian, H. Avakian, A. Avetissian, B. Bains, S. Barrow, W. Beckhusen, M. Beckmann, St. Belostotski, E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Böttcher, A. Borissov, J. Brack, B. Braun, B. Bray, S. Brons, W. Brückner, A. Brüll, H.J. Bulten, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, S. Clark, S. Colilli, H. Coombes, G.R. Court, P. Delheij, E. Devitsin, C.W. de Jager, E. De Sanctis, D. De Schepper, P.K.A. de Witt Huberts, P. Di Nezza, M. Doets, 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, G. Gavrilov, P. Geiger, V. Gharibyan, V. Giordjian, F. Giuliani, A. Golendoukhin, B. Grabowski, G. Graw, O. Grebeniouk, P. Green, G. Greeniaus, M. Gricia, C. Grosshauser, A. Gute, J.P. Haas, K. Hakelberg, W. Haeberli, J.-O. Hansen, D. Hasch, O. Hausser, R. Henderson, Th. Henkes, R. Hertenberger, Y. Holler, R.J. Holt, H. Ihssen, A. Izotov, M. Iodice, H.E. Jackson, A. Jgoun, C. Jones, R. Kaiser, J. Kelsey, E. Kinney, M. Kirsch, A. Kisselev, P. Kitching, H. Kobayashi, E. Kok, K. Königsmann, M. Kolstein, H. Kolster, W. Korsch, S. Kozlov, V. Kozlov, R. Kowalczyk, L. Kramer, B. Krause, A. Krivchitch, V.G. Krivokhijine, M. Kueckes, P. Kutt, G. Kyle, W. Lachnit, R. Langstaff, W. Lorenzon, M. Lucentini, A. Lung, N. Makins, V. Maleev, S.I. Manaenkov, K. Martens, A. Mateos, K. McIlhany, R.D. McKeown, F. Meißner, F. Menden, D. Mercer, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, M.A. Miller, R. Milner, V. Mitsyn, G. Modrak, J. Morton, 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, S. Patrichev, M. Pitt, H.J. Plett, H.R. Poolman, S. Potashov, D. Potterveld, B. Povh, V. Prahl, G. Rakness, V. Razmyslovich, R. Redwine, A.R. Reolon, R. Ristinen, K. Rith, H.O. Roloff, G. Röper, P. Rossi, S. Rudnitsky, H. Russo, D. Ryckbosch, Y. Sakemi, F. Santavenere, I. Savin, F. Schmidt, H. Schmitt, G. Schnell, K.P. Schüler, A. Schwind, T.-A. Shibata, T. Shin, B. Siebels, A. Simon, K. Sinram, W.R. Smythe, J. Sowinski, M. Spengos, K. Sperber, E. Steffens, J. Stenger, J. Stewart, F. Stock, U. Stößlein, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, D. Thiessen, B. Tipton, V. Trofimov, A. Trudel, M. Tytgat, G.M. Urciuoli, R. Van de Vyver, J.F.J. van den Brand, G. van der Steenhoven, J.J. van Hunen, D. van Westrum, A. Vassiliev, M.C. Vetterli, M.G. Vincter, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, G. Wöbke, K. Woller, S. Yoneyama, K. Zapfe-Düren, T. Zeuli, H. Zohrabian, and (Astro)-Particles Physics

Subjects
HERMES experiment, Nuclear and High Energy Physics, Particle physics, semi-inclusive scattering, (e, Physics::Instrumentation and Detectors, Cherenkov detector, CALORIMETERS, FOS: Physical sciences, deep inelastic lepton scattering, (e,e''h), Tracking (particle physics), Particle identification, High Energy Physics - Experiment, INORGANIC MATERIALS, law.invention, High Energy Physics - Experiment (hep-ex), e''h), GAS-MIXTURES, law, Nuclear Experiment, Instrumentation, Physics, Calorimeter (particle physics), Spectrometer, PERFORMANCE, magnetic spectrometer, Deep inelastic scattering, Transition radiation detector, CHAMBERS, High Energy Physics::Experiment
Abstract

The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give information on the spin structure of the nucleon. This paper describes the forward angle spectrometer built for this purpose. The spectrometer includes numerous tracking chambers (micro-strip gas chambers, drift and proportional chambers) in front of and behind a 1.3 T.m magnetic field, as well as an extensive set of detectors for particle identification (a lead-glass calorimeter, a pre-shower detector, a transition radiation detector, and a threshold Cherenkov detector). Two of the main features of the spectrometer are its good acceptance and identification of both positrons and hadrons, in particular pions. These characteristics, together with the purity of the targets, are allowing HERMES to make unique contributions to the understanding of how the spins of the quarks contribute to the spin of the nucleon., 37 pages, 32 figures, 4 tables

Published
1998

21. Measurement of the neutron spin structure function g with a polarized 3He internal target

Author

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

Subjects
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

22. Search for permanent EDM using laser cooled Fr atoms

Author

Hirokazu Kawamura, T. Aoki, H. Arikawa, S. Ezure, T. Furukawa, K. Harada, A. Hatakeyama, K. Hatanaka, T. Hayamizu, K. Imai, T. Inoue, T. Ishikawa, M. Itoh, T. Kato, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Published
2013

23. Zero-degree proton inelastic scattering to the1+,T=0 andT=1 states inC12

Author

Y. Sakemi, Atsushi Tamii, Yoshitaka Fujita, Tetsuo Noro, T. Inomata, Tomohiko Takahashi, H. Togawa, I. Daito, M. Fujiwara, Harutaka Sakaguchi, K. Hosono, M. Yosoi, Hidetoshi Akimune, Kichiji Hatanaka, and A. Yamagoshi

Subjects
Physics, Nuclear and High Energy Physics, Isovector, Proton, Degree (graph theory), Computer Science::Information Retrieval, Nuclear Theory, Zero (complex analysis), Tensor, Inelastic scattering, Atomic physics, Nuclear Experiment, Omega
Abstract

We have measured the zero-degree cross sections for proton inelastic scattering to the 1{sup +}, {ital T}=0 (12.7 MeV) and 1{sup +}, {ital T}=1 (15.1 MeV) states in {sup 12}C at 65, 100, 200, 300, and 400 MeV. The ratios of cross sections [{ital d}{sigma}/{ital d}{Omega}(1{sup +},{ital T}=0)]/[{ital d}{sigma}/{ital d}{Omega}(1{sup +},{ital T}=1)] at 0 {degree} are compared with the calculations in the distorted wave approximation using various effective nucleon-nucleon interactions. The experimental ratios are found to be smaller than the theoretical predictions. It was found that the experimental results were better described by modifying the isovector tensor terms of the effective interactions.

Published
1995

24. Development of a Magneto-Optical Trap System of Francium Atoms for the Electron Electric-Dipole-Moment Search

Author

K Harada, T Aoki, K Kato, H Kawamura, T Inoue, A Uchiyama, K Sakamoto, S Ito, M Itoh, T Hayamizu, A Hatakeyama, K Hatanaka, T Wakasa, and Y Sakemi

Subjects
Condensed Matter::Quantum Gases, History, Cyclotron, chemistry.chemical_element, Laser, 01 natural sciences, Electron electric dipole moment, 010305 fluids & plasmas, Computer Science Applications, Education, Francium, law.invention, chemistry, Beamline, T-symmetry, law, Magneto-optical trap, Laser cooling, 0103 physical sciences, Physics::Atomic Physics, Atomic physics, 010306 general physics
Abstract

The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for the violation of time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one of the strongest candidates for measuring the eEDM. We are constructing a beamline for measuring the eEDM using laser- cooled Fr atoms at the Cyclotron and Radioisotope Center. We have developed laser light sources including the frequency stabilization system and a magneto-optical trap system for Fr atoms. As the Fr production requires the cyclotron operation, we also use Rb atoms whose chemical properties are similar to those of the Fr atoms. Thus, the Rb beam is utilized for optimizing the operation parameters of the entire apparatus. We have also developed the laser light sources for Rb atoms and observed the beat signal for frequency stabilization of the source using the frequency offset locking method.

Published
2016

25. Development of Neutron Polarization Measurement System for Studying NN interaction in Nuclear Medium

Author

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

Subjects
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

26. Spin excitation strength from proton inelastic scattering at zero degree

Author

A. Yamagoshi, Y. Sakemi, Atsushi Tamii, M. Fujiwara, M. Yosoi, Kichiji Hatanaka, K. Hosono, Hidetoshi Akimune, Tetsuo Noro, H. Togawa, T. Inomata, Harutaka Sakaguchi, Yoshitaka Fujita, I. Daito, and Tomohiko Takahashi

Subjects
Physics, Nuclear and High Energy Physics, Degree (graph theory), Proton, Zero (complex analysis), Inelastic scattering, Atomic physics, Nuclear Experiment, Spin excitation, Excitation, Inelastic neutron scattering
Abstract

We have performed the 0 degree measurements of proton inelastic scattering for the 1+, T=0 (12.7 MeV) and 1+, T=1 (15.1 MeV) states in 12C at Ep=100, 200, 300, 400 MeV. The ratio of the excitation cross sections for these two states significantly deviates from the estimation of the distorted wave analysis, suggesting that the effective interactions VτT or Vσ might be modified to reproduce the experimental data.

Published
1994

27. Development of radiation sensor based on Pt/ZnO Schottky diode

Author

T. Chiba, Hidetomo Yoshida, S. Narita, Y. Sakemi, Y. Nishibori, M. Itoh, H. Endo, H. Naito, and H. Ito

Subjects
Materials science, business.industry, Schottky diode, Particle detector, law.invention, Ionizing radiation, law, Optoelectronics, Irradiation, business, Radiation hardening, Beam (structure), Diode, Light-emitting diode
Abstract

We have fabricated the Pt/ZnO Schottky diode based on the single crystal substrate grown by the hydrothermal growth method. The output signals from the diode were analyzed for the incidence of x-rays and α-rays, and the clear responses for those radiations were observed. We have demonstrated a potential of the ZnO based device for ionizing radiations. In addition, we investigated the radiation hardness of the ZnO material irradiating the diode sample with the high energy proton beam. The electrical characteristics have not been significantly changed even after irradiation of 1015 protons/cm2.

Published
2011

28. High-precision (p, t) Reactions to Determine Reaction Rates in the Stellar rp-process

Author

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

Subjects
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

29. 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

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

Subjects
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

30. Gamow-Teller strength distributions in 48Sc by the 48Ca(p,n) and 48Ti(n,p) reactions and two-neutrino double-beta decay nuclear matrix elements

Author

K, Yako, M, Sasano, K, Miki, H, Sakai, M, Dozono, D, Frekers, M B, Greenfield, K, Hatanaka, E, Ihara, M, Kato, T, Kawabata, H, Kuboki, Y, Maeda, H, Matsubara, K, Muto, S, Noji, H, Okamura, T H, Okabe, S, Sakaguchi, Y, Sakemi, Y, Sasamoto, K, Sekiguchi, Y, Shimizu, K, Suda, Y, Tameshige, A, Tamii, T, Uesaka, T, Wakasa, and H, Zheng

Abstract

The double-differential cross sections for the 48Ca(p,n) and 48Ti(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to the spectra to extract the Gamow-Teller (GT) components. The integrated GT strengths up to an excitation energy of 30 MeV in 48Sc are 15.3+/-2.2 and 2.8+/-0.3 in the (p,n) and (n,p) spectra, respectively. In the (n,p) spectra additional GT strengths were found above 8 MeV where shell models within the fp shell-model space predict almost no GT strengths, suggesting that the present shell-model description of the nuclear matrix element of the two-neutrino double-beta decay is incomplete.

Published
2009

31. High-Resolution B(GT) studies with ([sup 3]He,t) reactions

Author

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

Subjects
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

32. Study of [sup 12]C(p⃗,n⃗)[sup 12]N(g.s.;1[sup +]) at 296 MeV and Nuclear Correlation Effects

Author

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

33. Measurements of the [sup 116]Cd(p,n) and [sup 116]Sn(n,p) reactions at 300 MeV for studying Gamow-Teller transition strengths in the intermediate nucleus of the [sup 116]Cd double-β decay

Author

M. Sasano, H. Sakai, K. Yako, K. Miki, S. Noji, T. Wakasa, M. Dozono, K. Fujita, M. B. Greenfield, K. Hatanaka, T. Kawabata, H. Kuboki, Y. Maeda, H. Okamura, Y. Sakemi, K. Sekiguchi, Y. Shimizu, Y. Tameshige, A. Tamii, T. Uesaka, Y. Sasamoto, K. Itoh, K. Muto, Osvaldo Civitarese, Ivan Stekl, and Jouni Suhonen

Subjects
Physics, medicine.anatomical_structure, law, Double beta decay, Giant resonance, Nuclear Theory, Cyclotron, medicine, Atomic physics, Nuclear Experiment, Nucleus, law.invention
Abstract

The double differential cross sections for the 116Cd(p,n) and 116Sn(n,p) reactions at 300 MeV have been measured over a wide excitation‐energy region including Gamow‐Teller (GT) giant resonance (GTGR) for studying GT transition strengths in the intermediate nucleus of the 116Cd double‐β decay, namely 116In. A large amount of the strengths in the β+ direction has been newly found in the energy region up to 30 MeV, which may imply that the GT strengths in the GTGR region contribute to the nuclear matrix element of the two‐neutrino double‐β decay.

Published
2009

35. On the extraction of weak transition strengths via the (3He,t) reaction at 420 MeV

Author

R G T, Zegers, T, Adachi, H, Akimune, Sam M, Austin, A M, van den Berg, B A, Brown, Y, Fujita, M, Fujiwara, S, Galès, C J, Guess, M N, Harakeh, H, Hashimoto, K, Hatanaka, R, Hayami, G W, Hitt, M E, Howard, M, Itoh, T, Kawabata, K, Kawase, M, Kinoshita, M, Matsubara, K, Nakanishi, S, Nakayama, S, Okumura, T, Ohta, Y, Sakemi, Y, Shimbara, Y, Shimizu, C, Scholl, C, Simenel, Y, Tameshige, A, Tamii, M, Uchida, T, Yamagata, M, Yosoi, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), National Superconducting Cyclotron Laboratory (NSCL), Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
FOS: Physical sciences, 21.60.Cs, 24.50.+g, 25.40.Kv, 25.55.Kr, 25.60.Lg, 27.30.+t, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

Differential cross sections for transitions of known weak strength were measured with the (3He,t) reaction at 420 MeV on targets of 12C, 13C, 18O, 26Mg, 58Ni, 60Ni, 90Zr, 118Sn, 120Sn and 208Pb. Using this data, it is shown the proportionalities between strengths and cross sections for this probe follow simple trends as a function of mass number. These trends can be used to confidently determine Gamow-Teller strength distributions in nuclei for which the proportionality cannot be calibrated via beta-decay strengths. Although theoretical calculations in distorted-wave Born approximation overestimate the data, they allow one to understand the main experimental features and to predict deviations from the simple trends observed in some of the transitions., 4 pages, 2 figures

Published
2007

36. Gamow-Teller strength in the exotic odd-odd nuclei 138La and 180Ta and its relevance for neutrino nucleosynthesis

Author

A, Byelikov, T, Adachi, H, Fujita, K, Fujita, Y, Fujita, K, Hatanaka, A, Heger, Y, Kalmykov, K, Kawase, K, Langanke, G, Martínez-Pinedo, K, Nakanishi, P, von Neumann-Cosel, R, Neveling, A, Richter, N, Sakamoto, Y, Sakemi, A, Shevchenko, Y, Shimbara, Y, Shimizu, F D, Smit, Y, Tameshige, A, Tamii, S E, Woosley, and M, Yosoi

Abstract

The Gamow-Teller strength distributions below the particle threshold in 138La and 180Ta, deduced from high-resolution measurements of the (3He,t) reaction at 0 degrees, allow us to evaluate the role of charged-current reactions for the production of these extremely rare nuclides in neutrino-nucleosynthesis models. The analysis suggests that essentially all 138La in the Universe can be made that way. Neutrino nucleosynthesis also contributes significantly to the abundance of 180Ta but the magnitude depends on the unknown branching ratio for population of the long-lived isomer.

Published
2006

37. 4He(p,2p) REACTIONS FOR STUDYING IN-MEDIUM NN INTERACTIONS

Author

T. W. Y. Yasuda, K. S. H. Sakaguchi, Y. H. K. Hatanaka, S. Kishi, M. Uchida, H. Takeda, H. P. Yoshida, K. Fujita, S. Terashima, M. Yosoi, Y. Tameshige, T. Yonemura, S. Asaji, T. Noro, Y. Sakemi, Y. N. M. Nakamura, T. I. M. Ito, and Y. Shimizu

Published
2005

38. Fine structure of the Gamow-Teller resonance in 90Nb and level density of 1+ states

Author

Y, Kalmykov, T, Adachi, G P A, Berg, H, Fujita, K, Fujita, Y, Fujita, K, Hatanaka, J, Kamiya, K, Nakanishi, P, von Neumann-Cosel, V Yu, Ponomarev, A, Richter, N, Sakamoto, Y, Sakemi, A, Shevchenko, Y, Shimbara, Y, Shimizu, F D, Smit, T, Wakasa, J, Wambach, and M, Yosoi

Abstract

The fine structure of the Gamow-Teller resonance in a medium-heavy nucleus is observed for the first time in a high-resolution 90Zr(3He,t)90Nb experiment at the Research Center for Nuclear Physics, Osaka. Using a novel wavelet analysis technique, it is possible to extract characteristic energy scales and to quantify their relative importance for the generation of the fine structure. This method combined with the selectivity of the reaction permits an extraction of the level density of 1+ states in 90Nb.

Published
2005

39. STUDY OF THE SPIN DEPENDENT 3HE-NUCLEUS INTERACTION AT 450 MEV

Author

J. KAMIYA, K. HATANAKA, Y. SAKEMI, T. WAKASA, H. P. YOSHIDA, E. OBAYASHI, K. HARA, K. KITAMURA, Y. SHIMIZU, K. FUJITA, N. SAKAMOTO, Y. SHIMBARA, T. ADACHI, H. SAKAGUCHI, M. YOSOI, M. UCHIDA, Y. YASUDA, T. KAWABATA, and T. NORO

Published
2003

41. A 10 Mb 3D frame buffer memory with Z-compare and alpha-blend units

Author

K. Inoue, K. Shimotori, M. Yamawaki, J. Matsumoto, M. Ishikawa, T. Tani, Hiroyuki Kawai, C.A. Hart, E. Yokomoto, H. Matsuoka, K. Takahashi, K. Yamamoto, J. Lin, Hisashi Nakamura, K. Ishihara, and Y. Sakemi

Subjects
Hardware_MEMORYSTRUCTURES, business.industry, Computer science, Registered memory, Semiconductor memory, Parallel computing, Memory controller, CAS latency, Stencil buffer, Universal memory, Memory architecture, Interleaved memory, business, Computer hardware, Dram, Computer memory
Abstract

Describes a 3D-RAM frame buffer memory that integrates Z-compare and /spl alpha/-blend units on a single 10 Mb DRAM chip. 3D-RAM greatly accelerates rendering speed to 400 Mpixel/s, ten times as fast as conventional DRAMs and VRAMs.

Published
2002

42. Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms

Author

Hiroshi Arikawa, S. Ando, T. Aoki, S. Ezure, K. Harada, T. Hayamizu, T. Inoue, T. Ishikawa, M. Itoh, H. Kawamura, K. Kato, T. Kato, A. Uchiyama, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, H. S. Nataraj, T. Sato, Y. Shimizu, T. Wakasa, H. P. Yoshida, and Y. Sakemi

Subjects
Physics, Ion beam, Cyclotron, chemistry.chemical_element, Particle accelerator, law.invention, Francium, chemistry, law, Quadrupole, Atom, Physics::Accelerator Physics, Nuclear fusion, Atomic physics, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract

The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a (18)O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line.

Published
2014

43. Development of the Measurement System for the Search of an Electric Dipole Moment of the Electron with Laser-Cooled Francium Atoms

Author

T. Inoue, S. Ando, T. Aoki, H. Arikawa, S. Ezure, K. Harada, T. Hayamizu, T. Ishikawa, M. Itoh, K. Kato, T. Kato, H. Kawamura, H.S. Nataraj, T. Sato, A. Uchiyama, T. Furukawa, A. Hatakeyama, K. Hatanaka, K. Imai, T. Murakami, Y. Shimizu, T. Wakasa, H.P. Yoshida, and Y. Sakemi

Subjects
Physics, Field (physics), QC1-999, chemistry.chemical_element, Electron, Francium, Electric dipole moment, chemistry, Electric field, Atom, CP violation, Atomic physics, Voltage
Abstract

We plan to measure the permanent electric dipole moment (EDM) of the elec- tron, which has the sensitivity to the CP violation in theories beyond the standard model by using the laser-cooled francium (Fr) atom. This paper reports the present status of the EDM measurement system. A high voltage application system was constructed in order to produce the strong electric field (100 kV /cm) needed for the experiment. After condi- tioning, the leakage current was 10 pA when a high voltage of 43 kV was applied. Also, a drift of an environmental field was measured at the planned location of the Fr-EDM experiment. The drift is suppressed at present down to the level of 10 pT by installing a 4-layer magnetic shield. Improvements are still needed to reach the required field stability of 1 fT.

Published
2014

44. Single-spin azimuthal asymmetry in exclusive electroproduction of pi^+ mesons

Author

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, E.C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, V. Baturin, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. Böttcher, A. Borissov, O. Bouhali, M. Bouwhuis, J. Brack, S. Brauksiepe, A. Brüll, I. Brunn, H.J. Bulten, G.P. Capitani, P. Chumney, E. Cisbani, G. Ciullo, G.R. Court, P.F. Dalpiaz, R. De Leo, L. De Nardo, E. De Sanctis, D. De Schepper, E. Devitsin, P.K.A. de Witt Huberts, P. Di Nezza, M. Düren, M. Ehrenfried, G. Elbakian, F. Ellinghaus, J. Ely, R. Fabbri, A. Fantoni, A. Fechtchenko, L. Felawka, B.W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, A. Gute, W. Haeberli, K. Hafidi, M. Hartig, D. Hasch, D. Heesbeen, F.H. Heinsius, M. Henoch, R. Hertenberger, W.H.A. Hesselink, G. Hofman, Y. Holler, R.J. Holt, B. Hommez, G. Iarygin, A. Izotov, H.E. Jackson, A. Jgoun, P. Jung, R. Kaiser, A. Kisselev, P. Kitching, K. Königsmann, H. Kolster, V. Korotkov, E. Kotik, V. Kozlov, B. Krauss, V.G. Krivokhijine, G. Kyle, L. Lagamba, A. Laziev, P. Lenisa, P. Liebing, T. Lindemann, W. Lorenzon, A. Maas, N.C.R. Makins, H. Marukyan, F. Masoli, K. McIlhany, F. Meissner, F. Menden, V. Mexner, N. Meyners, O. Mikloukho, R. Milner, V. Muccifora, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, K. Negodaeva, W.-D. Nowak, K. Oganessyan, T.G. O'Neill, B.R. Owen, S.F. Pate, S. Podiatchev, S. Potashov, D.H. Potterveld, M. Raithel, G. Rakness, V. Rappoport, R. Redwine, D. Reggiani, P. Reimer, A.R. Reolon, K. Rith, D. Robinson, A. Rostomyan, D. Ryckbosch, Y. Sakemi, I. Sanjiev, F. Sato, I. Savin, C. Scarlett, A. Schäfer, C. Schill, F. Schmidt, G. Schnell, K.P. Schüler, A. Schwind, J. Seibert, B. Seitz, T.-A. Shibata, V. Shutov, M.C. Simani, A. Simon, K. Sinram, E. Steffens, J.J.M. Steijger, J. Stewart, U. Stösslein, K. Suetsugu, S. Taroian, A. Terkulov, S. Tessarin, E. Thomas, B. Tipton, M. Tytgat, G.M. Urciuoli, J.F.J. van den Brand, G. van der Steenhoven, R. van de Vyver, M.C. Vetterli, V. Vikhrov, M.G. Vincter, J. Visser, J. Volmer, C. Weiskopf, J. Wendland, J. Wilbert, T. Wise, S. Yen, S. Yoneyama, H. Zohrabian, (Astro)-Particles Physics, and Photo Conversion Materials

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, media_common.quotation_subject, Virtual particle, FOS: Physical sciences, 01 natural sciences, Asymmetry, NO, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Positron, 13.88.+e, 0103 physical sciences, 13.60.-r, 13.60.Le, 13.85.Fb, 010306 general physics, Nuclear Experiment, media_common, Physics, 010308 nuclear & particles physics, Scattering, LEADING ORDER, Polarization (waves), Physics and Astronomy, Condensed Matter::Strongly Correlated Electrons, High Energy Physics::Experiment, Nucleon, Lepton
Abstract

A single-spin asymmetry in the distribution of exclusively produced pi^+ mesons azimuthally around the virtual photon direction relative to the lepton scattering plane has been measured for the first time in deep-inelastic scattering of positrons off longitudinally polarized protons. Integrated over the experimental acceptance, the sin \phi moment of the polarization asymmetry of the cross section is measured to be -0.18 +/- 0.05 (stat.) +/- 0.02 (syst.). The asymmetry is also studied as a function of the relevant kinematic variables, and its magnitude is found to grow with decreasing x and increasing -t and vanish at t -> t_min (where x is the Bjorken scaling variable and t is the squared four-momentum transferred to the nucleon)., Comment: PLB accepted version, 6 pages, 4 figures, LaTex (revtex4), corrected typo

Published
2001
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45. The Q2 dependence of the generalized Gerasimov-Drell-Hearn integral for the proton

Author

A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, J. Arrington, E.C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. Böttcher, A. Borissov, M. Bouwhuis, J. Brack, S. Brauksiepe, B. Braun, W. Brückner, A. Brüll, P. Budz, H.J. Bulten, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dalpiaz, R. De Leo, L. De Nardo, E. De Sanctis, D. De Schepper, E. Devitsin, P.K.A. de Witt Huberts, P. Di Nezza, V. Djordjadze, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, A. Fechtchenko, M. Ferro-Luzzi, K. Fiedler, B.W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, A. Gute, W. Haeberli, M. Hartig, D. Hasch, D. Heesbeen, F.H. Heinsius, M. Henoch, R. Hertenberger, W. Hesselink, P. Hoffmann-Rothe, G. Hofman, Y. Holler, R.J. Holt, B. Hommez, G. Iarygin, M. Iodice, A. Izotov, H.E. Jackson, A. Jgoun, P. Jung, R. Kaiser, J. Kanesaka, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, H. Kolster, V. Korotkov, E. Kotik, V. Kozlov, V.G. Krivokhijine, G. Kyle, L. Lagamba, A. Laziev, P. Lenisa, T. Lindemann, W. Lorenzon, N.C.R. Makins, J.W. Martin, H. Marukyan, F. Masoli, M. McAndrew, K. McIlhany, R.D. McKeown, F. Menden, A. Metz, N. Meyners, O. Mikloukho, C.A. Miller, R. Milner, V. Mitsyn, V. Muccifora, R. Mussa, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, K. Negodaeva, W.-D. Nowak, T.G. O'Neill, R. Openshaw, J. Ouyang, B.R. Owen, S.F. Pate, S. Potashov, D.H. Potterveld, G. Rakness, V. Rappoport, R. Redwine, D. Reggiani, A.R. Reolon, R. Ristinen, K. Rith, D. Robinson, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, C. Scarlett, A. Schäfer, C. Schill, F. Schmidt, G. Schnell, K.P. Schüler, A. Schwind, J. Seibert, B. Seitz, T.-A. Shibata, T. Shin, V. Shutov, C. Simani, A. Simon, K. Sinram, E. Steffens, J.J.M. Steijger, J. Stewart, U. Stösslein, K. Suetsugu, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, S. Tessarin, 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, C. Weiskopf, J. Wendland, J. Wilbert, T. Wise, S. Yen, S. Yoneyama, H. Zohrabian, (Astro)-Particles Physics, and Photo Conversion Materials

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Proton, Nuclear Theory, FOS: Physical sciences, Virtual particle, Square (algebra), High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Quantum electrodynamics, High Energy Physics::Experiment, Twist, Nuclear Experiment, Sign (mathematics)
Abstract

The dependence on Q^2 (the negative square of the 4-momentum of the exchanged virtual photon) of the generalised Gerasimov-Drell-Hearn integral for the proton has been measured in the range 1.2 GeV^2 < Q^2 < 12 GeV^2 by scattering longitudinally polarised positrons on a longitudinally polarised hydrogen gas target. The contributions of the nucleon-resonance and deep-inelastic regions to this integral have been evaluated separately. The latter has been found to dominate for Q^2 > 3 GeV^2, while both contributions are important at low Q^2. The total integral shows no significant deviation from a 1/Q^2 behaviour in the measured Q^2 range, and thus no sign of large effects due to either nucleon-resonance excitations or non-leading twist., 9 pages, 3 figures, 1 table

Published
2000

46. Determination of the Deep Inelastic Contribution to the generalised Gerasimov-Drell-Hearn Intregral for the Proton and Neutron

Author

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, S. Belostotski, J.E. Belz, T. Benisch, S. Bernreuther, N. Bianchi, S. Blanchard, J. Blouw, H. Böttcher, A. Borissov, J. Brack, S. Brauksiepe, B. Braun, B. Bray, S. Brons, W. Brückner, A. Brüll, E.E.W. Bruins, H.J. Bulten, R. Cadman, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dal Piaz, 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. Gyurjyan, A. Golendoukhin, G. Graw, O. Grebeniouk, P.W. Green, L.G. Greeniaus, C. Grosshauser, M.G. Guidal, A. Gute, J.P. Haas, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, F.H. Heinsius, R. Henderson, T. 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, S.I. Manaenkov, 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. 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. Owen, V. Papavassiliou, S.F. Pate, M. Pitt, H.R. Poolman, S. Potashov, D.H. Potterveld, 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, M.C. Simani, A. Simon, K. Sinram, P. Slavich, 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, 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, M. Vincter, J. Visser, E. Volk, W. Wander, T.P. Welch, S.E. Williamson, T. Wise, K. Woller, S. Yoneyama, K. Zapfe-Düren, H. Zohrabian, R. Zurmühle, and (Astro)-Particles Physics

Subjects
Nuclear and High Energy Physics, Particle physics, Proton, Nuclear Theory, PARTON MODEL, Virtual particle, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, POLARIZED HE-3, SUM-RULES, Cross section (physics), High Energy Physics - Experiment (hep-ex), 0103 physical sciences, SCATTERING, Neutron, STRUCTURE-FUNCTION G(1)(N), 010306 general physics, Nuclear Experiment, NUCLEON, Quantum chromodynamics, Physics, 010308 nuclear & particles physics, Absorption cross section, Deep inelastic scattering, SPIN STRUCTURE-FUNCTION, RESONANCE REGION, High Energy Physics::Experiment, E-P, Nucleon
Abstract

The virtual photon absorption cross section differences [sigma_1/2-sigma_3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 GeV longitudinally polarised positrons from polarised 1H and 3He internal gas targets. The data were collected in the region above the nucleon resonances in the kinematic range nu < 23.5 GeV and 0.8 GeV**2 < Q**2 < 12 GeV**2. For the proton the contribution to the generalised Gerasimov-Drell-Hearn integral was found to be substantial and must be included for an accurate determination of the full integral. Furthermore the data are consistent with a QCD next-to-leading order fit based on previous deep inelastic scattering data. Therefore higher twist effects do not appear significant., 6 pages, 3 figures, 1 table, revtex

Published
1998

47. The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering

Author

K. Ackerstaff, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E. C. Ashenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, St. Belostotski, J. E. Belz, Th. Benisch, S. Bernreuther, N. Bianchi, 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, E. De Sanctis, D. De Schepper, E. Devitsin, P. K. A. de Witt Huberts, P. Di Nezza, M. Düren, A. Dvoredsky, G. Elbakian, A. Fantoni, A. Fechtchenko, M. Ferstl, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, M.-A. Funk, N. D. Gagunashvili, 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, A. Gute, W. Haeberli, J.-O. Hansen, D. Hasch, O. Häusser, R. 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, 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, V. G. Krivokhijine, M. Kurisuno, G. Kyle, W. Lachnit, W. Lorenzon, N. C. R. Makins, S. I. Manaenkov, F. K. Martens, J. W. Martin, F. Masoli, A. Mateos, M. McAndrew, K. McIlhany, R. D. McKeown, F. M. Menden, F. Meissner, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, M. A. Miller, R. 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, T. G. O'Neill, 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, H. Roloff, P. Rossi, S. Rudnitsky, M. Ruh, D. Ryckbosch, Y. Sakemi, I. Savin, F. Schmidt, H. Schmitt, G. Schnell, K. P. Schüler, A. Schwind, 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. Urciuoli, J. J. van Hunen, R. van de Vyver, J. F. J. van den Brand, G. van der Steenhoven, M. C. Vetterli, M. G. Vincter, E. Volk, W. Wander, S. E. Williamson, T. Wise, K. Woller, S. Yoneyama, H. Zohrabian, and (Astro)-Particles Physics

Subjects
Quark, Particle physics, Proton, media_common.quotation_subject, High Energy Physics::Lattice, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, PROTON, 01 natural sciences, 7. Clean energy, Asymmetry, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pion, DRELL-YAN PROCESS, 0103 physical sciences, 010306 general physics, NUCLEON, Nuclear Experiment, media_common, Physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Phenomenology, Deep inelastic scattering, Deuterium, PARTON DISTRIBUTIONS, High Energy Physics::Experiment, Nucleon, BREAKING
Abstract

The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02, Comment: 7 Pages, 2 figures, RevTeX format; slight revision in text, small change in extraction of dbar-ubar and comparison with a high q2 parameterization

Published
1998

48. M�ssbauer study of Fe magnetic state at the interface between Fe-Al-Si thin films and crystallized glass substrate

Author

Kazumasa Matusita, Y. Sakemi, K. Shimagami, Takayuki Komatsu, and M. Miyazaki

Subjects
Materials science, Annealing (metallurgy), Analytical chemistry, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Magnetic field, Nuclear magnetic resonance, Ferromagnetism, Conversion electron mössbauer spectroscopy, Mössbauer spectroscopy, Electrical and Electronic Engineering, Thin film, Spectroscopy, Sendust
Abstract

The magnetic state of Fe atoms at or near the interface between Fe74.3Al9.8Si15.9 sendust magnetic thin films and SiO2-based crystallized glass substrate (Fotoceram, Corning Co.) has been examined using conversion electron Mossbauer spectroscopy. The thicknesses of sputtered films are 0.05–2.0 Μm, and annealing conditions are at 500 ‡C for 1 H. The excellent soft magnetic properties are not obtained for films with a thickness of less than 0.5 Μm. The presence of ferromagnetic Fe atoms with internal magnetic fields of 24.3–24.9 MAm−1 is confirmed at or near the interface, indicating the formation of an Fe-rich phase such as Fe90Si10. The fraction of Fe atoms forming the Fe-rich phase at or near the interface is estimated to be around 20.... The formation of the Fe-rich phase is one of the main reasons for the degradation of the soft magnetic properties of sendust films deposited on SiO2-based crystallized glass substrate, even though the DO3-type ordered structure has also been formed.

Published
1996

49. Isospin symmetry of T_z =±3/2 →±1/2 Gamow-Teller transitions in A=41 nucllei

Author

Y., Fujita, Y., Shimbara, T., Adachi, G.P.A., Berg, B.A., Brown, H., Fujita, K., Hatanaka, J., Kamiya, K., Nakanishi, Y., Sakemi, Y., Shimizu, Y., Tameshige, M., Uchida, T., Wakasa, M., Yosoi, S., Sasaki, Y., Fujita, Y., Shimbara, T., Adachi, G.P.A., Berg, B.A., Brown, H., Fujita, K., Hatanaka, J., Kamiya, K., Nakanishi, Y., Sakemi, Y., Shimizu, Y., Tameshige, M., Uchida, T., Wakasa, M., Yosoi, and S., Sasaki

Published
2004

50. 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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