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Journal Articles

A Preliminary result on time-reversal invariance violation in polarized neutron transmission through polarized $$^{139}$$La

Nakabe, 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

https://doi.org/10.7566/JPSCP.45.011066

We evaluate the time-reversal invariance violation using previous neutron transmission data with polarized neutrons propagating through a transversely polarized $$^{139}$$La. By incorporating precise spin observables and the scattering amplitudes into our analysis, we preliminarily constrained the time-reversal invariance violating cross section.

Journal Articles

Measurements of circular polarization from the 0.75-eV p-wave resonance of the $$^{139}$$La(n,$$gamma$$)$$^{140}$$La reaction

Endo, Shunsuke; Fujioka, Hiroyuki*; Goto, Yu*; Ino, Takashi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; Kobayashi, Ryuju; et al.

JPS Conference Proceedings (Internet), 45, p.011056_1 - 011056_8, 2026/06

https://doi.org/10.7566/JPSCP.45.011056

Journal Articles

First constraint on the P-odd/T-odd cross section in polarized neutron transmission through transversely polarized $$^{139}$$La

Nakabe, 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

https://doi.org/10.1093/ptep/ptag088
 Times Cited Count：0

We report the first constraint on time-reversal invariance violating (TRIV) effects in polarized neutron transmission through a transversely polarized $$^{139}$$La target. We formulate the transmission asymmetry within the density matrix formalism, explicitly incorporating the forward scattering amplitude of $$^{139}$$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 $$0.75$$~eV $$p$$-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 $$chi^2$$ structure in the parameter space, we obtain an upper limit of $$|W_T|<15~mathrm{eV}$$ at the 90% confidence level. This corresponds to an upper limit on the resonance-averaged TRIV cross section of $$|Deltasigma_{not{T}not{P}}|<8.3times10^2~mathrm{b}$$. These results validate the present theoretical framework and provide guidance for future dedicated TRIV searches in polarized neutron transmission experiments.

Journal Articles

Circular polarization measurement of $$gamma$$-rays emitted from $$^{32}$$S(n,$$gamma$$)$$^{33}$$S reaction with polarized neutrons

Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Iinuma, Masataka*; Iwamoto, Nobuyuki; Iwamoto, Osamu; Kameda, Kento*; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; et al.

EPJ Web of Conferences, 329, p.05003_1 - 05003_3, 2025/06

https://doi.org/10.1051/epjconf/202532905003
 Times Cited Count：0 Percentile：0.00(Physics, Nuclear)

no abstracts in English

Journal Articles

Development of a compact ${it in situ}$ $$^{3}$$He neutron spin filter at J-PARC

Takahashi, Shingo; Kiyanagi, Ryoji; Okudaira, Takuya*; Takada, Shusuke*; Kobayashi, Ryuju; Okuizumi, Mao; Ino, Takashi*; Asai, Kanta*; Tsuchikawa, Yusuke; Oikawa, Kenichi; et al.

Nuclear Instruments and Methods in Physics Research A, 1075, p.170410_1 - 170410_8, 2025/06

https://doi.org/10.1016/j.nima.2025.170410
 Times Cited Count：2 Percentile：51.17(Instruments & Instrumentation)

Journal Articles

Circular polarization measurement for individual gamma rays in capture reactions with intense pulsed neutrons

Endo, Shunsuke; Abe, Ryota*; Fujioka, Hiroyuki*; Ino, Takashi*; Iwamoto, Osamu; Iwamoto, Nobuyuki; Kawamura, Shiori*; Kimura, Atsushi; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; et al.

European Physical Journal A, 60(8), p.166_1 - 166_10, 2024/08

https://doi.org/10.1140/epja/s10050-024-01392-6
 Times Cited Count：5 Percentile：73.54(Physics, Nuclear)

Journal Articles

Spin dependence in the $$p$$-wave resonance of $$^{139}$$$overrightarrow{textrm{La}}$+$overrightarrow{n}$

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

https://doi.org/10.1103/PhysRevC.109.044606
 Times Cited Count：3 Percentile：42.78(Physics, Nuclear)

Journal Articles

High sensitivity of a future search for effects of $$P$$-odd/$$T$$-odd interactions on the 0.75 eV $$p$$-wave resonance in $$overrightarrow{n}$$+$$^{139}overrightarrow{textrm{La}}$$ forward transmission determined using a pulsed neutron beam

Nakabe, 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

https://doi.org/10.1103/PhysRevC.109.L041602
 Times Cited Count：2 Percentile：7.93(Physics, Nuclear)

Oral presentation

On the feasibility of time-reversal invariance violation in neutron transmission

Nakabe, Rintaro*; Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Ino, Takashi*; Kawamura, Shiori*; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; Oku, Takayuki; Okudaira, Takuya*; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of evaluation system for $$^{3}$$He spin filters at J-PARC

Kobayashi, Ryuju; Oku, Takayuki; 6 of others*

no journal, , 

Oral presentation

Overview of NOPTREX and determination of an upper limit of T-odd/P-odd cross section in $$vec{n}$$ + $$vec{^{139}rm{La}}$$

Nakabe, Rintaro; Endo, Shunsuke; Kobayashi, Ryuju; Oku, Takayuki

no journal, , 

no abstracts in English

Oral presentation

Spin determination for excited states of $$^{140}$$La by circular polarization measurement in the $$^{139}$$La(n,$$gamma$$)$$^{140}$$La reaction

Endo, Shunsuke; Okudaira, Takuya*; Okuizumi, Mao*; Kawamura, Shiori*; Kitaguchi, Masaaki*; Kimura, Atsushi; Kobayashi, Ryuju; Shima, Tatsushi*; Shimizu, Hirohiko*; Takada, Shusuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

None

Kobayashi, Ryuju; Oku, Takayuki; 8 of others*

no journal, , 

no abstracts in English

Oral presentation

None

Kobayashi, Ryuju; Oku, Takayuki; 5 of others*

no journal, , 

no abstracts in English

Oral presentation

Measurements of parity violation in neutron induced reactions

Snow, W. M.*; Auton, C.*; Endo, Shunsuke; Fujioka, Hiroyuki*; Ide, Ikuo*; Ino, Takashi*; Goto, Yu*; Kawamura, Shiori*; Kitaguchi, Masaaki*; Kobayashi, Ryuju*; et al.

no journal, , 

no abstracts in English

Oral presentation

A Measurement of the final-state dependence of the parity violation in a compound nucleus with $$^{139}$$La

Goto, Yu*; Ito, Yuki*; Ide, Ikuo*; Ino, Takashi*; Endo, Shunsuke; Oku, Takayuki; Okudaira, Takuya*; Okuizumi, Mao*; Kameda, Kento*; Kawamura, Shiori*; et al.

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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