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Journal Articles

Contrasting magnetic structures in SrLaCuSbO$$_{6}$$ and SrLaCuNbO$$_{6}$$; Spin-$$frac{1}{2}$$ quasi-square-lattice $$J_{1}$$-$$J_{2}$$ Heisenberg antiferromagnets

Watanabe, Masari*; Kurita, Nubuyuki*; Tanaka, Hidekazu*; Ueno, Wataru*; Matsui, Kazuki*; Goto, Takayuki*; Hagihara, Masato

Physical Review B, 105(5), p.054414_1 - 054414_12, 2022/02

https://doi.org/10.1103/PhysRevB.105.054414
 Times Cited Count：2 Percentile：62.62(Materials Science, Multidisciplinary)

Journal Articles

Shell structure of the neutron-rich isotopes $$^{69,71,73}$$Co

Lokotko, T.*; Leblond, S.*; Lee, J.*; Doornenbal, P.*; Obertelli, A.*; Poves, A.*; Nowacki, F.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Authelet, G.*; et al.

Physical Review C, 101(3), p.034314_1 - 034314_7, 2020/03

https://doi.org/10.1103/PhysRevC.101.034314
 Times Cited Count：8 Percentile：73.73(Physics, Nuclear)

The structures of the neutron-rich $$^{69,71,73}$$Co isotopes were investigated via ($$p,2p$$) knockout reactions at the Radioactive Isotope Beam Factory, RIKEN. Level schemes were reconstructed using the $$gamma-gamma$$ coincidence technique, with tentative spin-parity assignments based on the measured inclusive and exclusive cross sections. Comparison with shell-model calculations suggests coexistence of spherical and deformed shapes at low excitation energies in the $$^{69,71,73}$$Co isotopes.

Journal Articles

Nuclear structure of $$^{76}$$Ni from the ($$p$$,$$2p$$) reaction

Elekes, Z.*; Kripk$'o$, $'A$*; Sohler, D.*; Sieja, K.*; Ogata, Kazuyuki*; Yoshida, Kazuki; Doornenbal, P.*; Obertelli, A.*; Authelet, G.*; Baba, Hidetada*; et al.

Physical Review C, 99(1), p.014312_1 - 014312_7, 2019/01

https://doi.org/10.1103/PhysRevC.99.014312
 Times Cited Count：8 Percentile：67.32(Physics, Nuclear)

The nuclear structure of the $$^{76}$$Ni nucleus was investigated by ($$p$$,$$2p$$) reaction using a NaI(Tl) array to detect the deexciting prompt $$gamma$$ rays. A new transition with an energy of 2227 keV was identified by $$gamma gamma$$ and $$gamma gamma gamma$$ coincidences. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z = 28 shell gap for nickel isotopes in accordance with previous studies.

Journal Articles

The Crystal structure of $$delta$$-Al(OH)$$_{3}$$; Neutron diffraction measurements and ab initio calculations

Matsui, Masanori*; Komatsu, Kazuki*; Ikeda, Emi*; Sano, Asami; Goto, Hirotada*; Yagi, Takehiko*

American Mineralogist, 96(5-6), p.854 - 859, 2011/05

https://doi.org/10.2138/am.2011.3672
 Times Cited Count：12 Percentile：36.74(Geochemistry & Geophysics)

Neutron powder diffraction analyses of $$delta$$-Al(OD)$$_{3}$$ revealed that the crystals are orthorhombic with space group ${it P}$2$$_{1}$$2$$_{1}$$2$$_{1}$$, but not ${it Pnma}$ as reported previously by X-ray diffraction data. The initial lattice parameters and the atomic positions of both Al and O were taken from previous X-ray structural analyses for the ${it Pnma}$ structure, while the H atom positions were determined using ab initio calculations. The $$delta$$-Al(OH)$$_{3}$$ structure possesses one relatively long and two short O-H...O hydrogen bonds. Ab initio calculations are also used to find that $$delta$$-Al(OH)$$_{3}$$ with space group ${it P}$2$$_{1}$$2$$_{1}$$2$$_{1}$$ transforms to another high pressure polymorph with space group ${it Pnma}$ at around 67 GPa, and that the two short hydrogen bonds in $$delta$$-Al(OH)$$_{3}$$ become both symmetric through the transformation, in which the protons are located at the midpoints of the O...O hydrogen bonds.

Oral presentation

In-situ measurement of permeability in rock mass using water including clay

Oketani, Kazuki*; Nara, Yoshitaka*; Matsui, Hiroya; Fujii, Hirokazu*

no journal, , 

For the geological disposal of radioactive wastes, it is important to understand the long-term migration of radionuclides. The network of fractures and pores in a rock mass, which have a role as the pathway of the fluid flow of materials, may change due to sealing of a material in the long term. We measured changes in hydraulic conductivity of crystalline rock mass using water mixed with clays sampled from a fault in the Mizunami Underground Research Laboratory, Japan Atomic Energy Agency. This result indicates that permeability of in-situ rock mass is possible to decrease by fracture filling with a clay material in a fault.

Oral presentation

Field-induced magnetic phase transitions in the triangular-lattice antiferromagnet CuFeO$$_{2}$$ investigated by time-of-flight neutron diffraction in long-pulse magnetic fields

Watanabe, Masao; Nakajima, Taro*; Inamura, Yasuhiro; Matsui, Kazuki*; Kanda, Tomoki*; Nomoto, Tetsuya*; Oishi, Kazuki*; Kawamura, Yukihiko*; Saito, Hiraku*; Tamatsukuri, Hiromu; et al.

no journal, , 

In recent years, due to advances in precision measurement technology in pulsed magnetic fields, a novel magnetic state was discovered in a strong magnetic field. We constructed a measurement environment that can comprehensively explore the reciprocal lattice space under magnetic fields up to 14 Tesla by combining the long-pulse magnetic field generated by the supercapacitor and pulsed neutrons at J-PARC. This equipment can generate a magnetic field that is sufficiently longer than the time width (about 10 milliseconds) of the multi-wavelength neutron pulse passing through the sample. This method was used to investigate the magnetic phase transition in the frustrated magnet CuFeO$$_{2}$$.

6 (Records 1-6 displayed on this page)
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