Observation of field-induced single-ion magnetic anisotropy in a multiorbital Kondo alloy (Lu,Yb)RhZn

Kitazawa, Takafumi; Ikeda, Yoichi*; Sakakibara, Toshiro*; Matsuo, Akira*; Shimizu, Yusei*; Tokunaga, Yo; Haga, Yoshinori; Kindo, Koichi*; Nambu, Yusuke*; Ikeuchi, Kazuhiko*; et al.

Physical Review B, 108(8), p.085105_1 - 085105_7, 2023/08

https://doi.org/10.1103/PhysRevB.108.085105

Nonmagnetic-magnetic transition and magnetically ordered structure in SmS

Yoshida, Shogo*; Koyama, Takehide*; Yamada, Haruhiko*; Nakai, Yusuke*; Ueda, Koichi*; Mito, Takeshi*; Kitagawa, Kentaro*; Haga, Yoshinori

Physical Review B, 103(15), p.155153_1 - 155153_5, 2021/04

https://doi.org/10.1103/PhysRevB.103.155153

Magnetic field induced phenomena in UIrGe in fields applied along the axis

Pospil, J.*; Haga, Yoshinori; Kohama, Yoshimitsu*; Miyake, Atsushi*; Kambe, Shinsaku; Tateiwa, Naoyuki; Valika, M.*; Proschek, P.*; Prokleka, J.*; Sechovsk, V.*; et al.

Physical Review B, 98(1), p.014430_1 - 014430_7, 2018/07

https://doi.org/10.1103/PhysRevB.98.014430

Fermi surface, magnetic, and superconducting properties in actinide compounds

Onuki, Yoshichika; Settai, Rikio*; Haga, Yoshinori; Machida, Yo*; Izawa, Koichi*; Honda, Fuminori*; Aoki, Dai*

Comptes Rendus Physique, 15(7), p.616 - 629, 2014/08

https://doi.org/10.1016/j.crhy.2014.06.005

Twofold spontaneous symmetry breaking in the heavy-fermion superconductor UPt

Machida, Yo*; Ito, Atsushi*; So, Yoshinao*; Izawa, Koichi*; Haga, Yoshinori; Yamamoto, Etsuji; Kimura, Noriaki*; Onuki, Yoshichika; Tsutsumi, Yasumasa*; Machida, Kazushige*

Physical Review Letters, 108(15), p.157002_1 - 157002_5, 2012/04

https://doi.org/10.1103/PhysRevLett.108.157002

Development of an ISI robot for the fast breeder reactor MONJU primary heat transfer system piping

Tagawa, Akihiro; Ueda, Masashi; Yamashita, Takuya; Narisawa, Masataka*; Haga, Koichi*

Journal of Nuclear Science and Technology, 48(4), p.504 - 509, 2011/04

https://doi.org/10.3327/jnst.48.504

This paper describes the development of a new inspection robot for the in-service inspection of the heat transfer system of the fast breeder reactor MONJU. The inspection was carried out using a tire-type ultrasonic sensor for volumetric tests at high temperature (atmosphere, 55 C; piping surface, 80 C) and radiation exposure condition (dose rate, 10 mGy/h; piping surface dose rate, 15 mGy/h). An inspection robot using a new tire type for the ultrasonic testing sensor and a new control method was developed. A signal-to-noise ratio S/N over 2 was obtained during the functional test for a calibration defect with a depth of 50%t (from the tube wall thickness). In the automatic inspection test, an EDM slit with a depth of 9% from the pipe thickness was detectable and with an S/N ratio = 4.0 (12.0 dB).

Magnetic field and pressure phase diagrams of uranium heavy-fermion compound UZn

Tateiwa, Naoyuki; Ikeda, Shugo*; Haga, Yoshinori; Matsuda, Tatsuma; Yamamoto, Etsuji; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; Kindo, Koichi*; Onuki, Yoshichika*

Journal of the Physical Society of Japan, 80(1), p.014706_1 - 014706_8, 2011/01

https://doi.org/10.1143/JPSJ.80.014706

We have performed the magnetization measurements in high magnetic fields up to 53 T on single crystals of an uranium heavy fermion compound UZn. In the antiferromagnetic state below the Nel temperature = 9.7 K, a metamagnetic transition is found at 32 T for the field along the [110] direction (-axis). The magnetic phase diagram for the field along the [110] direction is given. We have also carried out high pressure resistivity measurement on UZn using a diamond anvil cell up to 8.7 GPa. The Nel temperature is almost pressure-independent up to 4.7 GPa and starts to increase at the higher pressure region. The pressure dependences of the coefficient of term in the electrical resistivity , an antiferromagnetic gap and a characteristic temperature are discussed.

Molecular and crystal structures of plutonyl(VI) nitrate complexes with N-alkylated 2-pyrrolidone derivatives; Cocrystallization potentiality of U and Pu

Kim, S.-Y.; Takao, Koichiro*; Haga, Yoshinori; Yamamoto, Etsuji; Kawata, Yoshihisa; Morita, Yasuji; Nishimura, Kenji*; Ikeda, Yasuhisa*

Crystal Growth & Design, 10(5), p.2033 - 2036, 2010/04

https://doi.org/10.1021/cg100015t

Plutonyl(VI) nitrate complexes with N-cyclohexyl-2-pyrrolidone (NCP) and N-neopentyl-2-pyrrolidone (NNpP) were prepared, and their molecular and crystal structures were determined by single crystal X-ray analysis. The obtained compounds have the similar composition, PuO(NO)(NRP) (NRP = NCP, NNpP), which are analogous to the corresponding U(VI) complexes. Both PuO(NO)(NRP) complexes show typical structural properties of actinyl(VI) nitrates, i.e., hexagonal-bipyramidal geometry consisting of two NRP molecules and two NO ions located in trans positions in the equatorial plane of PuO moiety. These findings provide one of criteria in selection of suitable NRP as a precipitation agent for the spent nuclear fuel reprocessing based on the precipitation method.

Heavy fermion state in YbIrZn

Yoshiuchi, Shingo*; Toda, Masatoshi*; Matsushita, Masaki*; Yasui, Shinichi*; Hirose, Yusuke*; Oya, Masahiro*; Katayama, Keisuke*; Honda, Fuminori*; Sugiyama, Kiyohiro*; Hagiwara, Masayuki*; et al.

Journal of the Physical Society of Japan, 78(12), p.123711_1 - 123711_4, 2009/12

https://doi.org/10.1143/JPSJ.78.123711

Analytical work at NUCEF in FY 2007

Abe, Hiroyoshi; Haga, Takahisa; Fukaya, Hiroyuki; Sonoda, Takashi; Sakazume, Yoshinori; Ito, Mitsuo; Shirahashi, Koichi

JAEA-Technology 2009-008, 24 Pages, 2009/03

JAEA-Technology-2009-008.pdf:5.62MB

Analysis of the uranyl nitrate solution fuel is carried out at the analytical laboratory of NUCEF (Nuclear Fuel Cycle Engineering Research Facility), which provides essential data for operation of STACY (Static Experiment Critical Facility), TRACY (Transient Experiment Critical Facility) and the fuel treatment system. Analyzed in FY 2007 were uranyl nitrate solution fuel samples taken before and after experiments of STACY and TRACY, samples for the preparation and pulification of uranyl nitrate solution fuel in the fuel treatment system and samples for nuclear material accountancy purpose. The total number of the samples analyzed in FY 2007 was 143. This report summarizes work related to the analysis and management of the analytical laboratory in the FY 2007.