JOPSS - Search Results

Journal Articles

Electronic structures of ultra-thin silicon carbides deposited on graphite

Baba, Yuji; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Nath, K. G.

Applied Surface Science, 234(1-4), p.246 - 250, 2004/07

https://doi.org/10.1016/j.apsusc.2004.05.045

Times Cited Count：10 Percentile：46.03(Chemistry, Physical)

no abstracts in English

Journal Articles

Novel instrument system for discriminating secondary particles in high-spatial-resolution neutron detection

Yamagishi, Hideshi; Nakamura, Tatsuya; Soyama, Kazuhiko; Masaoka, Sei; Aizawa, Kazuya

Review of Scientific Instruments, 75(7), p.2340 - 2345, 2004/07

https://doi.org/10.1063/1.1765754

Times Cited Count：9 Percentile：45.30(Instruments & Instrumentation)

A new instrument system with the capability of secondary-particle discrimination (InSPaD) was studied for the development of two-dimensional neutron detectors (2D-ND) filled with helium-3 gas and with high spatial resolution. The InSPaD can discriminate between the tracks of a proton and a triton created in the nuclear reaction $^{3}$ He(,) by simply setting the level of discriminators appropriately in each signal channel, and the system exhibits a high spatial resolution, high counting rate, low background, and stability. The simulations of the 2D-ND equipped with the InSPaD revealed spatial resolutions of 0.46 mm in full width at half maximum for a 10% mixture of C $_{2}$ H $_{6}$ with helium-3 at 0.3 MPa. The results of neutron-detection experiments using a microstrip gas chamber, including the range of the secondary particles and the pulse-height distribution, agreed well with the simulated results, indicating the feasibility of the InSPaD.

JAEA Reports

Development of micro-strip gas chamber for neutron scattering; Development and simulation of encode board

Masaoka, Sei; Nakamura, Tatsuya; Yamagishi, Hideshi; Soyama, Kazuhiko

JAERI-Research 2003-012, 14 Pages, 2003/06

JAERI-Research-2003-012.pdf:1.58MB

A micro-strip gas chamber (MSGC) using helium-3 gas has been developing as a two-dimensional position sensitive neutron detector for neutron scattering experiments in a high-intensity proton accelerator facility. We have developed the encode board that have built-in FPGAs (Field-Programmable Gate Array). Logics of FPGAs can be freely programmed to carry out digital processing of signals from MSGC and information of the tracks of protons and tritons can be obtained by the encode board. Therefore, the position of neutron capture (more properly the centra of the track) can be calculated by a series of data handling system. As the result of the simulation of a neutron detection experiment, it has proved that the position resolution of less than 1.6 mm can be obtained by using this data handling system.

Journal Articles

A SrBPO $_{5}$ :Eu $^{2+}$ storage phosphor for neutron imaging

Sakasai, Kaoru; Katagiri, Masaki; To, Kentaro; Takahashi, Hiroyuki*; Nakazawa, Masaharu*; Kondo, Yasuhiro*

Applied Physics A, 74(Suppl.1), p.S1589 - S1591, 2002/12

https://doi.org/10.1007/s003390101255

Times Cited Count：30 Percentile：71.28(Materials Science, Multidisciplinary)

A phosphor material such as SrBPO $_{5}$ :Eu $^{2+}$ has been investigated for two-dimensional imaging for pulsed-neutron source. The authors found this phosphor itself shows photostimulated luminescence (PSL) by illumination of 635 nm laser light after neutron irradiation without adding any neutron sensitive materials such as Gd. The PSL intensity per neutron flux was proportional to E $^{-0.5}$ , where E is neutron energy. The neutron sensitivity was increased by using enriched boron instead of natural boron. The S $_{gamma}$ /S $_{n}$ ratio of this phosphor using enriched boron was better than that of a commercially available imaging plate, where S $_{gamma}$ and S $_{n}$ are gamma and neutron sensitivities, respectively.