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Journal Articles

A Demonstration study of focusing geometry SANS using a magnetic neutron lens

Oku, Takayuki; Suzuki, Junichi; Sasao, Hajime*; Yamada, Satoru; Furusaka, Michihiro*; Adachi, Tomohiro*; Shinohara, Takenao*; Ikeda, Kazuaki*; Shimizu, Hirohiko

Physica B; Condensed Matter, 356(1-4), p.126 - 130, 2005/02

 Times Cited Count:10 Percentile:44.37(Physics, Condensed Matter)

We have developed a magnetic neutron lens (MNL) based on a sextupole magnet. A neutron beam, which is incident to the sextupole magnet, either converges or diverges depending on the neutron spin state. Small-angle neutron scattering in focusing geometry (FSANS) was proposed to improve the q-resolution and/or measuring efficiency. The MNL is considered to be the most suitable focusing device for FSANS experiments using a polarized neutron beam, since it focuses the polarized neutron beam free from neutron attenuation and scattering by substances. Recently, we have developed the MNLs with sufficiently large apertures and strong focusing power for FSANS experiments. In this study, we evaluate the focusing property of the MNLs for the polarized neutron beam, and performed FSANS experiments using the MNL. The obtained results are discussed.

Journal Articles

Feasibility study on application of a magnetic neutron lens to SANS experiments

Oku, Takayuki; Suzuki, Junichi; Sasao, Hajime*; Adachi, Tomohiro*; Shinohara, Takenao*; Ikeda, Kazuaki*; Morishima, Takahiro*; Sakai, Kenji*; Kiyanagi, Yoshiaki*; Furusaka, Michihiro*; et al.

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.116 - 119, 2004/08

 Times Cited Count:18 Percentile:75.95(Instruments & Instrumentation)

As a neutron has a magnetic dipole moment, it is accelerated in a magnetic field gradient. Thus, we can control a neutron trajectory free from neutron beam attenuation and scattering using the magnetic field gradient. A sextupole magnetic field functions as a neutron focusing and defocusing lens depending on the neutron spin state. The neutron focusing effect was experimentally verified using a 6-piece permanent sextupole magnet. For the application in practical neutron scattering experiments, a sextupole magnet with a sufficiently large aperture accompanied with strong focusing power is demanded. Recently, a superconducting sextupole magnet, a Halbach-type permanent sextupole magnet and a sextupole pulse electro-magnet have been developed in a project of the development and application of neutron optics. These magnets will be dedicated to practical uses in neutron scattering experiments. In this paper, current status of the development of the magnetic neutron lenses is reported, and their application in the neutron scattering experiments is discussed.

Journal Articles

Ion collection from photoionized plasma with a wire electrode in weak magnetic field

Adachi, Hajime; Tamura, Koji; Ogura, Koichi; Shibata, Takemasa

Japanese Journal of Applied Physics, 38(12A), p.6887 - 6889, 1999/12

 Times Cited Count:0 Percentile:0(Physics, Applied)

no abstracts in English

Journal Articles

Charge transfer cross sections for uranium

Tamura, Koji; Adachi, Hajime*; Ogura, Koichi; Oba, Hironori; Shibata, Takemasa

Japanese Journal of Applied Physics, Part 1, 38(11), p.6512 - 6516, 1999/11

 Times Cited Count:12 Percentile:51.93(Physics, Applied)

no abstracts in English

Journal Articles

Charge transfer cross sections for dysprosium and cerium

Tamura, Koji; Adachi, Hajime; Shibata, Takemasa

Japanese Journal of Applied Physics, Part 1, 38(5A), p.2973 - 2977, 1999/05

 Times Cited Count:6 Percentile:33.31(Physics, Applied)

no abstracts in English

Journal Articles

Secondary electron emission yield from uranium surface due to uranium ion bombardment

Tamura, Koji; ; Adachi, Hajime; Oba, Hironori; Shibata, Takemasa

Japanese Journal of Applied Physics, Part 1, 38(4A), p.2122 - 2123, 1999/04

 Times Cited Count:8 Percentile:40.72(Physics, Applied)

no abstracts in English

JAEA Reports

Charge transfer cross section for uranium

Adachi, Hajime; Tamura, Koji; ; Ogura, Koichi; Oba, Hironori; Shibata, Takemasa

JAERI-Research 99-029, 19 Pages, 1999/03

JAERI-Research-99-029.pdf:0.94MB

no abstracts in English

JAEA Reports

Secondary electron emission from uranium surface due to uranium ion bombardment

Tamura, Koji; ; Adachi, Hajime; Oba, Hironori; Shibata, Takemasa

JAERI-Research 98-073, 10 Pages, 1998/12

JAERI-Research-98-073.pdf:0.52MB

no abstracts in English

Journal Articles

Development of a compact atomic beam flux monitor based on surface ionization

Tamura, Koji; ; Adachi, Hajime; Shibata, Takemasa; Oba, Hironori

Japanese Journal of Applied Physics, Part 1, 37(12A), p.6651 - 6654, 1998/12

 Times Cited Count:0 Percentile:0(Physics, Applied)

no abstracts in English

JAEA Reports

Intensity distributions of ion beams produced by laser ion source

Adachi, Hajime; Tamura, Koji; ; Shibata, Takemasa

JAERI-Tech 98-029, 32 Pages, 1998/08

JAERI-Tech-98-029.pdf:1.32MB

no abstracts in English

JAEA Reports

Atomic beam velocities of rare earth metals produced by electron beam heating

; Tamura, Koji; Adachi, Hajime; Oba, Hironori; *; Shibata, Takemasa

JAERI-Tech 98-020, 17 Pages, 1998/06

JAERI-Tech-98-020.pdf:0.64MB

no abstracts in English

JAEA Reports

Charge transfer cross sections for dysprosium and cerium

Adachi, Hajime; Tamura, Koji; ; Shibata, Takemasa

JAERI-Research 98-030, 29 Pages, 1998/06

JAERI-Research-98-030.pdf:1.22MB

no abstracts in English

JAEA Reports

Measurements of atomic beam flux of rare earth elements by means of surface ionization

Tamura, Koji; Adachi, Hajime; Shibata, Takemasa

JAERI-Research 98-020, 13 Pages, 1998/03

JAERI-Research-98-020.pdf:0.66MB

no abstracts in English

JAEA Reports

Effects of magnetic field on photo-ionized ion collection with a wire electrode

Adachi, Hajime; Tamura, Koji; Ogura, Koichi; Shibata, Takemasa

JAERI-Research 98-014, 20 Pages, 1998/03

JAERI-Research-98-014.pdf:0.76MB

no abstracts in English

Journal Articles

Measurement of charge transfer cross sections of dysprosium and cerium

Tamura, Koji; Adachi, Hajime; ; Shibata, Takemasa

Proc. of 6th Workshop on Separation Phenomena in Liquids and Gases (SPG'98), p.219 - 230, 1998/00

no abstracts in English

Journal Articles

Measurements of atomic beams of rare earth elements by means of surface ionization

Tamura, Koji; Adachi, Hajime; Shibata, Takemasa

Shinku, 41(3), p.332 - 334, 1998/00

no abstracts in English

Oral presentation

Study on the generation process of radioactive particles emitted from Unit 1 of FDNPP

Ishii, Tatsuya*; Sueki, Keisuke*; Matsuo, Kazuki*; Kurosawa, Masanori*; Satou, Yukihiko; Kobata, Masaaki; Fukuda, Tatsuo; Yoshii, Kenji; Tanida, Hajime; Okane, Tetsuo; et al.

no journal, , 

Radioactive particles were released into the environment by the accident of Fukushima Daiichi Nuclear Power Plant (FDNPP). They have information to understand the inside of the reactor during the accident. Now, nobody knows the generation process of radioactive particles. In this study, we analyzed (1) elements of particles' cross section with SEM-EDS to reveal what is the material and (2) chemical states of elements on particles' surface with HAXPES. (1) Radioactive particles are composed of the two parts. One is the basic material and the other is the heavy elemental materials. We considered the basic material was soda-lime glass and the heavy elemental materials included lead glass. (2) HAXPES brought out that the chemical states of Cs on particles, surface was different in the Na-poor areas and the Na-rich areas. In the Na-poor areas, the chemical state of Cs showed CsFeSiO$$_4$$ mainly, but zero valence partly. In the Na-rich areas, the chemical state of Cs couldn't be identified. For above analyses, we can reveal the generation process of radioactive particles.

17 (Records 1-17 displayed on this page)
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