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LaNakabe, Rintaro; Endo, Shunsuke; Kambara, Wataru*; Kimura, Atsushi; Kobayashi, Ryuju; Oku, Takayuki; Sakai, Kenji; Shinohara, Takenao; Takahashi, Ryuta*; Tsuchikawa, Yusuke; et al.
JPS Conference Proceedings (Internet), 45, p.011066_1 - 011066_5, 2026/06
We evaluate the time-reversal invariance violation using previous neutron transmission data with polarized neutrons propagating through a transversely polarized La. By incorporating precise spin observables and the scattering amplitudes into our analysis, we preliminarily constrained the time-reversal invariance violating cross section.
LaNakabe, Rintaro; Endo, Shunsuke; Kambara, Wataru*; Kawamura, Shihori; Kimura, Atsushi; Kobayashi, Ryuju; Oku, Takayuki; Okudaira, Takuya*; Sakai, Kenji; Shinohara, Takenao; et al.
Progress of Theoretical and Experimental Physics (Internet), 2026(6), p.063D01_1 - 063D01_15, 2026/06
Times Cited Count：0 Percentile：0.00(Physics, Multidisciplinary)We report the first constraint on time-reversal invariance violating (TRIV) effects in polarized neutron transmission through a transversely polarized La target. We formulate the transmission asymmetry within the density matrix formalism, explicitly incorporating the forward scattering amplitude of La including tensor polarization terms up to third-rank. The formalism is applied to existing transmission data originally obtained to measure the spin-dependent cross section near the 
~eV 
-wave resonance. Since these data were not optimized for P-odd/T-odd observables, the attainable sensitivity is intrinsically limited; nevertheless, they provide a useful test of the formalism on real experimental data. No statistically significant TRIV signal is observed. By analyzing the global 
structure in the parameter space, we obtain an upper limit of 
at the 90% confidence level. This corresponds to an upper limit on the resonance-averaged TRIV cross section of 
. These results validate the present theoretical framework and provide guidance for future dedicated TRIV searches in polarized neutron transmission experiments.
-containing porous hydrogel via freeze-crosslinking for efficiency and salt-robust dye DecolorizationSugita, Tsuyoshi; Ueda, Yuki; Nakabe, Rintaro; Mori, Masanobu*; Nankawa, Takuya; Sekine, Yurina
Journal of Photochemistry and Photobiology A; Chemistry, 473, p.116773_1 - 116773_9, 2026/04
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)We developed a WO-embedded hydrogel (WFG) by freeze-cross-linking that retained high activity even in the presence of coexisting salts. Confocal laser scanning microscope revealed interconnected channels < 200 
m. ensuring good water permeability, and contrast-matching small-angle neutron scattering showed that the secondary particle size of embedded WO (~300 nm) matched that in aqueous suspension. Under visible-light irradiation, WFG decolorized indigo carmine (INC) 1.5-fold increase in rate than suspended WO and 3.7-fold increase in rate than a WO-coated glass plate. Coexisting salts (NaNO, NaCl, Na
SO
, NaHPO) altered the decolorization efficiency; NaNO and NaSO enhanced, whereas Cl
and HPO suppressed the reaction, indicating that ionic strength and anion-species affect contact efficiency and charge transfer.
Kumada, Takayuki; Nakabe, Rintaro; Nakagawa, Hiroshi
Teion Kagaku, 84, p.13 - 17, 2026/03
Hiroi, Kosuke; Nakabe, Rintaro; Oku, Takayuki; Kumada, Takayuki; Motokawa, Ryuhei
Journal of Applied Crystallography, 59(1), p.69 - 79, 2026/02
Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)Ueda, Yuki; Kobayashi, Toru; Nakamura, Satoshi; Ban, Yasutoshi; Kaneta, Yui; Nabatame, Nozomi; Micheau, C.; Tokunaga, Kohei; Nakabe, Rintaro; Kaneko, Masashi*; et al.
Langmuir, 42(1), p.1613 - 1626, 2026/01
Times Cited Count：0 Percentile：0.00(Chemistry, Multidisciplinary)Understanding the structural factors governing the metal ions selectivity of solvent extraction systems is crucial for developing advanced processes for partitioning and transmutation of high-level radioactive waste. Here, we systematically investigated the effect of alkyl side-chain branching in nitrilotriacetamide (NTAamide) extractants on the extraction of lanthanum (La) and neodymium (Nd), chosen as representative lanthanides. Four extractants having each eight carbon atoms as one of the amide chains with identical molecular weights but different degrees of alkyl branching were examined. Distribution ratios were measured as a function of HNO concentration, and the local coordination structures of La and Nd were analyzed by extended X-ray absorption fine structure (EXAFS), while supramolecular aggregation in the organic phase was characterized by small-angle neutron scattering (SANS). EXAFS analysis revealed that the inner-sphere coordination environment of La and Nd was essentially unaffected by the degree of alkyl branching. In contrast, SANS results showed that extractants with fewer branched alkyl groups formed larger aggregates at low HNO concentrations, particularly in the case of Nd, where aggregation was found to facilitate extraction and prevent precipitation of poorly soluble complexes. These findings demonstrate that alkyl branching strongly influences supramolecular aggregation, which in turn governs extraction behavior. This work highlights the potential of nanoscale structural control as a new design concept for improving selectivity in lanthanide and actinide solvent extraction systems.
-odd/
-odd interactions on the 0.75 eV -wave resonance in 
+
forward transmission determined using a pulsed neutron beamNakabe, Rintaro*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Gudkov, V.*; Hirota, Katsuya*; Ide, Ikuo*; Ino, Takashi*; Ishikado, Motoyuki*; Kambara, Wataru*; et al.
Physical Review C, 109(4), p.L041602_1 - L041602_4, 2024/04
Times Cited Count：2 Percentile：12.20(Physics, Nuclear)-wave resonance of 
+
Okudaira, Takuya*; Nakabe, Rintaro*; Auton, C. J.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Gudkov, V.*; Ide, Ikuo*; Ino, Takashi*; Ishikado, Motoyuki*; Kambara, Wataru*; et al.
Physical Review C, 109(4), p.044606_1 - 044606_9, 2024/04
Times Cited Count：3 Percentile：54.38(Physics, Nuclear)Sugita, Tsuyoshi; Ueda, Yuki; Nakabe, Rintaro; Mori, Masanobu*; Nankawa, Takuya; Sekine, Yurina
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Hiroi, Kosuke; Kumada, Takayuki; Nakabe, Rintaro; Motokawa, Ryuhei; Oku, Takayuki
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+ 
Nakabe, Rintaro; Endo, Shunsuke; Kobayashi, Ryuju; Oku, Takayuki
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Sasaki, Miki; Nakabe, Rintaro; Kumada, Takayuki; Motokawa, Ryuhei
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LaGoto, Yu*; Ito, Yuki*; Ide, Ikuo*; Ino, Takashi*; Endo, Shunsuke; Oku, Takayuki; Okudaira, Takuya*; Okuizumi, Mao*; Kameda, Kento*; Kawamura, Shiori*; et al.
no journal, ,
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Nakabe, Rintaro*; Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Ino, Takashi*; Kawamura, Shiori*; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; Oku, Takayuki; Okudaira, Takuya*; et al.
no journal, ,
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Snow, W. M.*; Auton, C.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Ino, Takashi*; Goto, Yu*; Kawamura, Shiori*; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; et al.
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no abstracts in English
Kumada, Takayuki; Motokawa, Ryuhei; Nakabe, Rintaro; Hiroi, Kosuke; Oku, Takayuki; Iwase, Hiroki*
no journal, ,
Hiroi, Kosuke; Kumada, Takayuki; Nakabe, Rintaro; Motokawa, Ryuhei; Oku, Takayuki
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