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Journal Articles

Measurement of the angular distribution of $$gamma$$-rays after neutron capture by $$^{139}$$La for a T-violation search

Okudaira, Takuya; Shimizu, Hirohiko*; Kitaguchi, Masaaki*; Hirota, Katsuya*; Haddock, C. C.*; Ito, Ikuya*; Yamamoto, Tomoki*; Endo, Shunsuke*; Ishizaki, Kohei*; Sato, Takumi*; et al.

EPJ Web of Conferences, 219, p.09001_1 - 09001_6, 2019/12

Parity violating effects enhanced by up to 10$$^6$$ times have been observed in several neutron induced compound nuclei. There is a theoretical prediction that time reversal (T) violating effects can also be enhanced in these nuclei implying that T-violation can be searched for by making very sensitive measurements. However, the enhancement factor has not yet been measured in all nuclei. The angular distribution of the (n,$$gamma$$) reaction was measured with $$^{139}$$La by using a germanium detector assembly at J-PARC, and the enhancement factor was obtained. From the result, the measurement time to achieve the most sensitive T-violation search was estimated as 1.4 days, and a 40% polarized $$^{139}$$La target and a 70% polarized $$^3$$He spin filter whose thickness is 70 atm$$cdot$$cm are needed. Therefore high quality $$^3$$He spin filter is developed in JAEA. The measurement result of the (n,$$gamma$$) reaction at J-PARC and the development status of the $$^3$$He spin filter will be presented.

Journal Articles

Development of multi-colored neutron talbot-lau interferometer with absorption grating fabricated by imprinting method of metallic glass

Seki, Yoshichika; Shinohara, Takenao; Parker, J. D.*; Yashiro, Wataru*; Momose, Atsushi*; Kato, Kosuke*; Kato, Hidemi*; Sadeghilaridjani, M.*; Otake, Yoshie*; Kiyanagi, Yoshiaki*

Journal of the Physical Society of Japan, 86(4), p.044001_1 - 044001_5, 2017/03

 Times Cited Count:13 Percentile:75.09(Physics, Multidisciplinary)

For the effective phase imaging at pulsed neutron sources, we have designed and developed the multi-colored Talbot-Lau interferometer which works at several wavelengths. At the Energy Resolved Neutron Imaging System RADEN in J-PARC, we demonstrated its operation by observing the visibilities of moire fringes derived from different wavelengths (0.25, 0.50, and 0.75 nm). We also investigated the variation of moire fringes dependent on the wavelength resolution from 18% to 50% and showed the advantage of pulsed beams. At the central wavelength of 0.5 nm, we have succeeded in interferometric imaging for the samples of metal rods made of aluminum, lead, and copper. An absorption grating as an analyzer was fabricated by imprinting of metallic glass for the first time, and showed a clear moire fringe with the high visibility of 68% and a well-controlled shape in comparison with previous ones fabricated by oblique evaporation of gadolinium.

Journal Articles

Experimental evaluation of neutron absorption grating fabricated by oblique evaporation of gadolinium for phase imaging

Seki, Yoshichika; Shinohara, Takenao; Ueno, Wakana; Parker, J. D.*; Samoto, Tetsuo*; Yashiro, Wataru*; Momose, Atsushi*

Physics Procedia, 88, p.217 - 223, 2017/00

 Times Cited Count:8 Percentile:97.89

Journal Articles

Breeding of stress-tolerant variety series in ornamentals by ion beam irradiation

Okamura, Masachika*; Momose, Masayuki*; Watanabe, Satomi*; Shimizu, Akira*; Hase, Yoshihiro; Yokota, Yuichiro; Tanaka, Atsushi

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 82, 2007/02

no abstracts in English

Journal Articles

Advances of mutagenesis in flowers and their industrialization

Okamura, Masachika*; Tanaka, Atsushi; Momose, Masaki*; Umemoto, Naoyuki*; Silva, J.*; Toguri, Toshihiro*

Floriculture, Ornamental and Plant Biotechnology; Advances and Topical Issues, Vol.1, p.619 - 628, 2006/00

no abstracts in English

Oral presentation

Development of stress tolerant variety series in ornamentals by ion beam breeding

Okamura, Masachika*; Momose, Masaki*; Watanabe, Satomi*; Tanaka, Atsushi; Hase, Yoshihiro

no journal, , 

no abstracts in English

Oral presentation

Flower breeding by quantum beam technology and their commercialization

Okamura, Masachika*; Momose, Masaki*; Umemoto, Naoyuki*; Toguri, Toshihiro*; Tanaka, Atsushi; Hase, Yoshihiro; Yamaguchi, Hiroyasu*; Morishita, Toshikazu*

no journal, , 

no abstracts in English

Oral presentation

Radiation protection feature and research at Tokai reprocessing plant

Momose, Takumaro; Endo, Kuniaki; Ito, Yasuhisa; Yamashita, Tomoyuki; Namiki, Atsushi; Sanada, Yukihisa; Akiyama, Kiyomitsu; Takeishi, Minoru; Tago, Itaru; Furuta, Sadaaki

no journal, , 

The first reprocessing pilot plant in Japan (Tokai Reprocessing Plant; TRP) has been operated since 1977 at Nuclear Fuel Cycle Engineering Laboratories, JAEA. General radiation protection in TRP is performed with continuous monitoring and sampling methods. The continuous monitors measuring $$gamma$$-ray, neutron, particulate alpha and beta nuclides in the air are installed in the radiation controlled area as a central monitoring system to prevent from unnecessary exposure. Air and water effluents from the TRP are also monitored by continuous monitors or sampling methods to comply with regulations. In addition to this, environmental monitoring has been carried out to assess influences on public and environment by the plant operation. A feature of radiation protection and its recent relevant researches at TRP will be introduced in this presentation.

Oral presentation

Experience of radiation protection at the Tokai Reprocessing Plant; Dismantlement work of glove box for process solution analysis

Shioya, Satoshi; Hirayama, Tsutomu*; Ebashi, Tsutomu; Namiki, Atsushi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Radiation management for the protection of beta-ray dose in Tokai Reprocessing plant, 2; Basic parameter on the management

Shioya, Satoshi; Sakuyama, Mitsuhiro*; Adachi, Yasuyuki*; Sato, Kenichiro*; Sanada, Yukihisa; Namiki, Atsushi; Momose, Takumaro

no journal, , 

no abstracts in English

Oral presentation

Whole-body measurements for people living in Fukushima prefecture

Nakagawa, Takahiro; Takada, Chie; Kanai, Katsuta; Murayama, Takashi; Miyauchi, Hideaki; Suzuki, Takehiko; Sato, Yoshitaka; Ezaki, Hiroko; Imahashi, Atsushi; Isozaki, Kohei; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of pulsed neutron phase imaging at RADEN

Seki, Yoshichika; Shinohara, Takenao; Ueno, Wakana; Seeghilaridjani, M.*; Kato, Hidemi*; Samoto, Tetsuo*; Yashiro, Wataru*; Momose, Atsushi*

no journal, , 

no abstracts in English

Oral presentation

Fabrication of an absorption grating for neutron phase imaging using Gd-based metallic glass imprinting

Ueno, Wakana; Shinohara, Takenao; Seki, Yoshichika; Kai, Tetsuya; Parker, J. D.*; Sadeghilaridjani, M.*; Kato, Hidemi*; Yashiro, Wataru*; Momose, Atsushi*

no journal, , 

no abstracts in English

Oral presentation

Neutron Talbot-Lau interferometry at pulsed neutron imaging system "RADEN" in J-PARC

Seki, Yoshichika; Shinohara, Takenao; Ueno, Wakana; Parker, J. D.*; Yashiro, Wataru*; Momose, Atsushi*

no journal, , 

Oral presentation

Neutron phase imaging with Talbot-Lau interferometer

Seki, Yoshichika; Shinohara, Takenao; Parker, J. D.*; Matsumoto, Yoshihiro*; Hino, Masahiro*; Samoto, Tetsuo*; Yashiro, Wataru*; Momose, Atsushi*

no journal, , 

no abstracts in English

Oral presentation

Development of direct-type alpha dust monitor for in-situ measurement of airborne concentration during fuel debris retrieval and decommissioning of nuclear fuel cycle facilities

Tsubota, Yoichi; Honda, Fumiya; Nakagawa, Takahiro; Kawasaki, Takashi; Ikeda, Atsushi; Tamakuma, Yuki*; Tokonami, Shinji*; Momose, Takumaro

no journal, , 

A large number of radioactive aerosols, especially alpha particles, are expected to be generated during fuel debris retrieval on Fukushima - Daiichi (1F) site and decommissioning of nuclear fuel cycle facilities. For conventional alpha dust monitor, 1-channel of silicon surface barrier detector (SSBD) is often used as a detector which has not so high limit of count rates. Moreover, since radioactive aerosol collected on a filter paper are measured by a detector, it is difficult to calculate an airborne concentration at the sampling site because a conventional dust monitor measures an integrated radioactivity on a filter paper. In this work, we developed a prototype of alpha dust monitor aiming at an in-situ measurement of high concentration airborne alpha particles. The efficiency for U$$_{3}$$O$$_{8}$$ checking source was 80.8%. For high count rate test using 3 MBq of $$^{241}$$Am checking source, 2.1 $$times$$ 10$$^{7}$$ cpm was achieved which was more than 10 times higher compared to an conventional alpha dust monitor using SSBD. For follow-up test to the airborne concentration of alpha particles using radon chamber, counting rate of prototype alpha dust monitor was smoothly followed with respect to the radon concentration in a radon chamber.

Oral presentation

New designs of Talbot-Lau interferometer at pulsed neutron imaging system RADEN in J-PARC

Seki, Yoshichika; Shinohara, Takenao; Parker, J. D.*; Matsumoto, Yoshihiro*; Samoto, Tetsuo*; Yashiro, Wataru*; Momose, Atsushi*

no journal, , 

17 (Records 1-17 displayed on this page)
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