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Journal Articles

Development of ZnS/ $^{6}$ LiF scintillating and MSGC neutron detectors in JAERI

Nakamura, Tatsuya; Katagiri, Masaki; Yamagishi, Hideshi; Tanaka, Hiroki; Sakasai, Kaoru; Soyama, Kazuhiko

Hamon, 15(1), p.67 - 73, 2005/01

https://doi.org/10.5611/hamon.15.67

Development of scintillating and gaseous neutron detectors in Japan Atomic Energy Research Institute is briefly described. In this paper, the performances of the developed 2-d neutron detectors, concerning ZnS/ $^{6}$ LiF scintillating detectors with wavelength shifting fiber read-out and micro-strip gas chambers with individual read-out, are presented.

Journal Articles

Development of a high-performance microstrip gas chamber with a capability of track discrimination for neutron detection

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

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.336 - 341, 2004/08

https://doi.org/10.1016/j.nima.2004.05.008

Times Cited Count：6 Percentile：40.37(Instruments & Instrumentation)

A microstrip gas chamber (MSGC) with a capability of track discrimination for neutron detection was developed whilst ensuring the stability of the MSGC and fulfilling the specifications required for detectors using in high-flux reactors and high-intensity pulsed-neutron sources. The developed two-dimensional detector system comprises a MSGC with individual signal channel read-outs and a new instrument system with a capability of secondary-particle discrimination (InSPaD). The InSPaD identifies the particles -proton and triton- created in the nuclear reaction $^{3}He + n rightarrow p + T$ by a simple, fast and cost-effective method using the difference in the track length, and it enables a small amount of heavy gas such as $C_{2}H_{6}$ with helium-3 to be used as the filling gas whilst achieving a high spatial resolution.

Journal Articles

Neutron detection by superconducting tunnel junctions on a Li $_{2}$ B $_{4}$ O $_{7}$ single-crystal absorber

Nakamura, Tatsuya; Katagiri, Masaki; Ukibe, Masahiro*; Ikeuchi, Takashi*; Okubo, Masataka*

Nuclear Instruments and Methods in Physics Research A, 520(1-3), p.67 - 69, 2004/03

https://doi.org/10.1016/j.nima.2003.11.222

Times Cited Count：28 Percentile：83.54(Instruments & Instrumentation)

We succeeded in detecting neutrons using superconducting tunnel junctions (STJs) fabricated on a single crystal of Li $_{2}$ B $_{4}$ O $_{7}$ . Neutrons are captured in the crystal by the nuclear reactions $^{6}$ Li + n T+ + 4.78 MeV and $^{10}$ B + n $^{7}$ Li + + 2.3 MeV, and generated phonons propagate in the absorber and are measured by the STJs. We selected a single crystal of Li $_{2}$ B $_{4}$ O $_{7}$ as the absorber material because of properties such as the large neutron cross-section of $^{6}$ Li and $^{10}$ B, low -ray sensitivity, short particle range in the substrate, and fast phonon velocity. Series-connected or multiple STJs on the crystal would enable two-dimensional neutron imaging with high detection efficiency, low gamma-ray background, and a high spatial resolution of a few microns. We demonstrate neutron detection by the STJs and show their X-ray response and neutron detection. The correlation in pulse heights between two junctions located 1.3mm apart clearly indicates the possibility of neutron imaging.