Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Segawa, Mariko; Shinohara, Takenao; Kai, Tetsuya; Oikawa, Kenichi; Harada, Masahide; Nakatani, Takeshi; Oi, Motoki; Sato, Hirotaka*; Kamiyama, Takashi*; Yokota, Hideo*; et al.
no journal, ,
O
Kiyanagi, Ryoji; Yamada, Shigeki*; Aoki, Hiroshi*; Sagayama, Hajime*; Moyoshi, Taketo*; Nakao, Akiko*; Arima, Takahisa*
no journal, ,
Manganites with perovskite-type structure have been attracted much attention because of their variety of orders and properties due to the competition between charges, orbitals and spins. The materials represented as ReBaMnO forms in an A-site ordered double perovskite structure and exhibit complicated phase diagrams depending on the kind of atoms of Re. In the case of Re = Sm, the material shows two charge-orbital orders and two anomalies in magnetic susceptibility, but the details have not been clarified. In this study, the magnetic structure in the antiferromagnetic phase and the relation between the charge-orbital order and the antiferromagnetic phase were investigated by means of neutron magnetic scattering. The measurements were performed on the single crystal neutron diffractometer, SENJU, at J-PARC/MLF. The diffraction pattern revealed magnetic reflections arising from the antiferromagnetic order, which is consistent with the charge-orbital ordering patterns. In addition, the anomaly at the lowest temperature was found due to the reorientation of the spin moments.
Nakatani, Takeshi; Inamura, Yasuhiro; Ito, Takayoshi*; Otomo, Toshiya*
no journal, ,
A neutron scattering experiment in MLF of J-PARC is done while changing measurement conditions. Variations of measurement conditions can be automatically done by the control software of the experimental instrument in MLF. In 2013, we have upgraded our standard control software framework of the instruments. The new framework, named "IROHA2" is more user-friend, available, flexible and scalable than the original IROHA. Last year, we have developed the sequence management server based on IROHA2 for an automatic measurement. The sequence management server has the functions which are not only sequential control but also feedback control with exchanging the parameters between control commands. The sequence management server has the web user interfaces as well as other software components of IROHA2. The interface is to edit the sequence of the automatic measurement, to run control the sequence and to monitor the sequence graphically. We will report the sequence management server of IROHA2.
Hiroi, Kosuke; Shinohara, Takenao; Hayashida, Hirotoshi*; Parker, J. D.*; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Arai, Masatoshi*
no journal, ,
We have been developing an imaging technique using polarized pulsed neutron for quantitative evaluation of magnetic field in industrial equipment, e.g. an electric motor and an electric transformer, etc. To reduce the power loss of these products, it is important to quantitatively evaluate not only strength of an internal field but also directional distribution. In this study, we attempt to evaluate direction of a field in the gap between the rotor and the stator of a model electric motor. Magnetic imaging experiment was performed at BL10 "NOBORU" in Materials and Life science experimental Facility (MLF) of J-PARC. In this experiment, we changed the quantized axis of a neutron spin using spin-rotators and obtained polarization images with various neutron spin directions. By analyzing change in polarization depending on neutron spin direction, we successfully obtained field-direction distribution image in the model motor.
Ohara, Takashi; Hanashima, Takayasu*; Munakata, Koji*; Moyoshi, Taketo*; Kiyanagi, Ryoji; Nakao, Akiko*; Kuroda, Tetsuya*
no journal, ,
Su, Y. H.; Oikawa, Kenichi; Harada, Masahide; Shinohara, Takenao; Kai, Tetsuya; Zhang, S.*; Parker, J. D.*; Sato, Hirotaka*; Shiota, Yoshinori*; Tomota, Yo*
no journal, ,
no abstracts in English
Kai, Tetsuya; Matsumoto, Yoshihiro*; Parker, J. D.*; Segawa, Mariko; Shinohara, Takenao; Hiroi, Kosuke; Su, Y. H.; Zhang, S.*; Hayashida, Hirotoshi*; Oikawa, Kenichi; et al.
no journal, ,
Nakagawa, Hiroshi
no journal, ,
Inelastic neutron scattering can measure the protein thermal fluctuations under the physiological conditions with aqueous environment, and is the powerful method to observe the low-energy protein dynamics in THz region, which is essential for the solvent-coupled protein dynamics. The selective observation of protein and hydration water by deuteration, and the complementary analysis of hydration structure and dynamics with molecular dynamics simulation are effective methods for studying the protein hydration. Protein dynamical transition is coupled with the fluctuation of the hydration water network covered over the protein surface. The hydration and vitrification of protein studied by inelastic scattering can be expected to give fruitful information not only for a basic science of protein physics but also for a molecular biology and an application for a food science.
Nakajima, Kenji; Kawamura, Seiko; Kikuchi, Tatsuya; Inamura, Yasuhiro; Kawakita, Yukinobu; Nakamura, Mitsutaka; Kajimoto, Ryoichi; Takata, Shinichi; Oikawa, Kenichi; Harada, Masahide
no journal, ,
AMATERAS is a cold-neutron multi disk-chopper spectrometer at Materials and Life Science Experimental Facility (MLF) in J-PARC. By using a pulse shaping chopper and owing to the high peak intensity from a coupled moderator source at MLF, AMATERAS is designed to realize high intensity and fine and flexible energy resolution measurements in quasielastic and inelastic neutron scattering experiments from cold to thermal neutron energy region. The spectrometer has had the first neutron beam in May 2009 and had the first user in December 2009. The user program on AMATERAS is running successfully for 5 years. Until June, 2014, experiments of 61 general proposals have been carried out, which have resulted more than 20 papers, 5 theses and nearly a hundred of presentations at scientific meetings. In parallel to the user program, machine study and commissioning work to improve spectrometer performance have been continuously done. Recently, we have finished refurbishment of the beam transport section. Also, there is a progress in background reduction work, development of data analysis method and preparation in sample environments. In this presentation, we will present the current status of AMATERAS together with ideas of future upgrade plans.
Tahara, Shuta*; Kawakita, Yukinobu
no journal, ,
no abstracts in English