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Sanada, Yukihisa; Nishizawa, Yukiyasu*; Ochi, Kotaro; Yuki, Yoichi*; Ishizaki, Azusa; Osada, Naoyuki*
JAEA-Research 2018-009, 48 Pages, 2019/01
JAEA-Research-2018-009.pdf:14.77MB
At the accident of nuclear facilities, a prediction of the behavior of released radioactive plume is indispensable to make a decision on a refuge plan of inhabitants. Currently, prediction system which is based on atmospheric dispersion simulation has been implemented as a tool of the atomic energy disaster prevention. However, the direct measurement method of the radioactive plume has not existed. In this study, some component technologies were developed for the establishment of direct measurement methods of radioactive plume using unmanned aerial vehicle whose technological innovation is remarkable. In addition, the spray test using mock aerosol was conducted to obtaining the deposition rate to the airplane body. The algorism of making a flight plan was developed based on a prediction model of the radioactive plume. This report summarized the outcome of the second year of the three-year plan.
Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*
Journal of the Korean Physical Society, 63(3), p.337 - 340, 2013/08
Times Cited Count：5 Percentile：38.26(Physics, Multidisciplinary)
Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*
Physical Review B, 84(21), p.214403_1 - 214403_7, 2011/12
Times Cited Count：9 Percentile：38.20(Materials Science, Multidisciplinary)We report NMR studies of TbCoGa, which has the tetragonal HoCoGa structure and exhibits two antiferromagnetic (AF) transitions at 
=36.2 K and 
=5.4 K. From a symmetry analysis of internal magnetic fields at orthorhombic Ga sites, we have successfully determined the magnetic structures in the AF-I (
) and AF-II (
) phases. The AF-I phase is a collinear AF order with a propagation vector ![$$q=[1/2, 0, 1/2]$$](/search/images/ERYT0WZRF2ZCYIBQFQQDCLZSLUSA.gif)
and ordered moments parallel to the [001] direction. In the AF-II phase, on the other hand, we found a non-collinear AF structure described by double propagation vectors ![$$q_1=[1/2, 0, 1/2]$$](/search/images/ERYV4MJ3LMYS4MRMEAYCYIBRF2ZF0JA.gif)
and ![$$q_{2}=[0, 1/2, 1/2]$$](/search/images/ERYV44ZSPU4VWMBMEAYS4MRMEAYS4MS3EQ.gif)
, where the moments tilt away from the [001] direction toward [100], keeping a constant value along the [001] direction. In the context of these results we discuss the possible presence of magnetic frustration in this system.
Osada, Naoyuki*; Ishizaki, Azusa; Nishizawa, Yukiyasu*; Yuki, Yoichi*; Sanada, Yukihisa
no journal, ,
no abstracts in English
(R=Tb, Ho)Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kobayashi, Riki
no journal, ,
no abstracts in English
Tokunaga, Yo; Saito, Yo*; Sakai, Hironori; Kambe, Shinsaku; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Kawasaki, Yu*; Kishimoto, Yutaka*
no journal, ,
We report NMR studies of TbCoGa, which has the tetragonal HoCoGa structure and exhibits two antiferromagnetic (AF) transitions at 
=36.2 K and 
=5.4 K. From analysis of the internal fields at Ga sites, we have determined the magnetic structures of the AF-I (
) and the AF-II (
) phases. The AF-I phase is a collinear AF order with the propagation vector q=[1/2, 0, 1/2] and with ordered moments parallel to the c axis. This is in accordance with the neutron diffraction measurements. In the AF-II phase, on the other hand, we found a non-collinear AF structure described with double propagation vectors 
=[1/2, 0, 1/2] and 
=[0, 1/2, 1/2]. Interestingly, the NMR reveals that the c component of the Tb moments does not change value between the AF-I and the AF-II phases, even though an a component is newly developed in the AF-II phase.
Michimura, Shinji; Inami, Toshiya; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*
no journal, ,
no abstracts in English
Kaneko, Koji; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*; Osakabe, Toyotaka
no journal, ,
no abstracts in English
CoGa (=Tb, Dy, Ho)Kobayashi, Riki; Kaneko, Koji; Wakimoto, Shuichi; Chi, S.*; Sanada, Naoyuki*; Watanuki, Ryuta*; Suzuki, Kazuya*
no journal, ,
no abstracts in English
(R=Tb, Dy, Ho) by single crystal neutron diffractometer SENJUKawasaki, Takuro; Kaneko, Koji; Watanuki, Ryuta*; Sanada, Naoyuki*; Suzuki, Kazuya*; Ohara, Takashi; Kiyanagi, Ryoji; Oikawa, Kenichi; Tamura, Itaru; Nakao, Akiko*; et al.
no journal, ,
no abstracts in English
