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Journal Articles

Development of a neutron-imaging detector based on pulse-height correlation between two superconducting tunnel junctions on a Li$$_{2}$$B$$_{4}$$O$$_{7}$$ crystal

Nakamura, Tatsuya; Katagiri, Masaki; Chen, Y. E.*; Ukibe, Masahiro*; Okubo, Masataka*

Nuclear Instruments and Methods in Physics Research A, 559(2), p.766 - 768, 2006/04

https://doi.org/10.1016/j.nima.2005.12.131
 Times Cited Count：13 Percentile：65.83(Instruments & Instrumentation)

We have been developing a position-sensitive neutron detector, which exhibits a high spatial resolution of the order of 10 microns and high detection efficiency. The analysis on the pulse-heights or on the time-delay between the STJs gives incident positions of the neutrons. In this paper, the response of the STJs/LBO neutron detector measured using a cold neutron beam is presented. The two STJs have the same size of 50 $$times$$ 50 $$mu$$ m$$^{2}$$ and their distance is 1.3 mm. The count intensity in the correlation map varied depending on the incident position of the neutron beam which gives an evidence for the position-sensitivity of the detector. These experimental results were qualitatively understood by a simple solid-angle model.

Journal Articles

Discrimination of neutrons and $$gamma$$ ray by a neutron detector comprising a superconducting tunnel junction on a single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$

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

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.402 - 404, 2004/08

https://doi.org/10.1016/j.nima.2004.05.020
 Times Cited Count：8 Percentile：48.81(Instruments & Instrumentation)

We evaluated the neutron-$$gamma$$-rays discrimination of the neutron detector comprising a superconducting tunnel junction (STJ) on the single crystal of Li$$_{2}$$B$$_{4}$$O$$_{7}$$. The neutron detector was irradiated with X-rays, $$gamma$$-rays and neutrons, and the signal pulses were analyzed including pulse height distributions and rise times. It was found that the most of the signal pulses for the neutron-events exhibited slower rise times than those for X-rays and $$gamma$$-rays. This indicated the capability of neutron-$$gamma$$-rays discrimination of the detector using the differences in the decay time of the signal current.

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：84.49(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 $$rightarrow$$ T+ $$alpha$$ + 4.78 MeV and $$^{10}$$B + n $$rightarrow$$ $$^{7}$$Li + $$alpha$$ + 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 $$gamma$$-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.

Journal Articles

Research of superconducting tunnel junction X-ray detectors with direct signal observation method using a fast current readout system

Kishimoto, Maki; Katagiri, Masaki; Nakamura, Tatsuya; Okubo, Masataka*; Ukibe, Masahiro*; Kurakado, M.*; Kanno, Ikuo*; Fukuda, Daiji*; Takahashi, Hiroyuki*; Kraus, H.*; et al.

Nuclear Instruments and Methods in Physics Research A, 444(1-2), p.124 - 128, 2000/04

https://doi.org/10.1016/S0168-9002(99)01343-1
 Times Cited Count：4 Percentile：36.74(Instruments & Instrumentation)

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