@article{5d3604fa459544278a9bc22247762955,
title = "A cold/ultracold neutron detector using fine-grained nuclear emulsion with spatial resolution less than 100 nm",
abstract = "A new type of cold/ultracold neutron detector that can realize a spatial resolution of less than 100 nm was developed using nuclear emulsion. The detector consists of a fine-grained nuclear emulsion coating and a 50-nm thick 10B 4C layer for the neutron conversion. The detector was exposed to cold and ultracold neutrons (UCNs) at the J-PARC. Detection efficiencies were measured as (0.163 ± 0.015 (stat) ± 0.013 (sys))% and (10.3 ± 1.3 (stat) ± 1.1 (sys))% for cold and ultracold neutrons consistently with the 10B content in the converter. Positions of individual neutrons can be determined by observing secondary particle tracks recorded in the nuclear emulsion. The spatial resolution of incident neutrons were found to be in the range of 11–99 nm in the angle region of tanθ≤ 1.9 , where θ is the angle between a recorded track and the normal direction of the converter layer. The achieved spatial resolution corresponds to the improvement of one or two orders of magnitude compared with conventional techniques and it is comparable with the wavelength of UCNs.",
author = "N. Naganawa and T. Ariga and S. Awano and M. Hino and K. Hirota and H. Kawahara and M. Kitaguchi and K. Mishima and Shimizu, {H. M.} and S. Tada and S. Tasaki and A. Umemoto",
note = "Funding Information: Acknowledgements We thank T. Naka, T. Asada, and S. Furuya for providing us fine-grained nuclear emulsion gels, and for their advice regarding their use. We are also grateful to A. Young, T. Ito, and C. Morris for performing test exposure experiments at Los Alamos National Laboratory and fruitful discussions and suggestions on the structure of our detector. Test exposures for previous types of this detector were done at Kyoto University Accelerator-driven Neutron Source with the assistance of M. Hirose and T. Nagae. This work was supported by a JSPS KAKENHI Grant number JP26800132. The experiment was approved by the Neutron Science Proposal Review Committee of J-PARC/MLF (Proposal nos. 2014B0270, 2015A0242, and 2016A0213) and the Neutron Scattering Program Advisory Committee of IMSS, KEK (Proposal no. 2014S03). Publisher Copyright: {\textcopyright} 2018, The Author(s).",
year = "2018",
month = nov,
day = "1",
doi = "10.1140/epjc/s10052-018-6395-7",
language = "English",
volume = "78",
journal = "European Physical Journal C",
issn = "1434-6044",
publisher = "Springer New York",
number = "11",
}