Slow Positron Facility



Total-Reflection High-Energy Positron Diffraction (TRHEPD)
  • Y. Motoyama, K. Yoshimi, I. Mochizuki, H. Iwamoto, H. Ichinos, T. Hoshi, "Data-analysis software framework 2DMAT and its application to experimental measurements for two-dimensional material structures", Comput. Phys. Commun. 280, 108465 (2022).
  • Y. Tsujikawa, M. Shouji, M. Hamada, T. Takeda, I. Mochizuki, T. Hyodo, I. Matsuda and A. Takayama, "Structure of χ3-Borophene studied by Total-reflection high-energy positron diffraction (TRHEPD)", Molecules 27, 4219 (2022).
  • Low-Energy Positron Diffraction (LEPD)
    • K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, T. Takahashi, M. Maekawa, A. Kawasuso, M. Kimura, and T. Hyodo, "Progress report on construction of a low-energy positron diffraction (LEPD) experiment station at KEK", JJAP Conf. Proc. 7, 011301-1-6 (2019).
    • K. Wada, T. Shirasawa, I. Mochizuki, M. Fujinami, M. Maekawa and A. Kawasuso, "Observation of Low-Energy Positron Diffraction Patterns with a Linac-Based Slow-Positron Beam", e-J. Surf. Sci. Nanotech. 16, 313-319 (2018).
    General-Purpose Station
    Positronium Time-of-Flight (Ps-TOF)
    • A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, Y Nagashima, and A. Ishida, "Positronium emission from GaN(0001) and AlN(0001) surfaces", J. Phys. B: At. Mol. Opt. Phys. 54, 205202 (2021).
    • A. Kawasuso, K. Wada, A. Miyashita, M. Maekawa, H. Iwamori, S. Iida and Y. Nagashima, "Positronium formation at 4H SiC(0001) surfaces" J. Phys.: Condens. Matter 33, 035006-1-7 (2021).
    • A. Kawasuso, M. Maekawa, A. Miyashita, K. Wada, T. Kaiwa, and Y. Nagashima, "Positronium formation at Si surfaces", Phys. Rev. B 97, 245303-1-8 (2018).
    • S. Iida, K Wada, I Mochizuki, T Tachibana, T Yamashita, T Hyodo, Y Nagashima, "Emission of low-energy positronium from alkali-metal coated single-crystal tungsten surfaces", J. Phys.: Condens. Matter 28, 475002-1-4 (2016).
    • H. Terabe, S. Iida, T. Yamashita, T. Tachibana, B. Barbiellini, K. Wada, I. Mochizuki, A. Yagishita, T. Hyodo, Y. Nagashima , "Increase in the positronium emission yield from polycrystalline tungsten surfaces by sodium coating", Surface Science 641, 68 (2015).
    • H. Terabe, S. Iida, K. Wada, T. Hyodo, A Yagishita, and Y. Nagashima, "Efficient emission of positronium atoms from an Na-coated polycrystalline tungsten surface", J. Phy.: Conf. Ser. 443, 012075 (2013).
    Transmission Positron Microscope
    • M. Matsuya, S. Jinno, T. Ootsuka, M. Inoue, T. Kurihara, M. Doyama, M. Inoue and M. Fujinami, "Development of a transmission positron microscope", Nucl. Instrum. Methods, A 645, 102 (2011).
    • T. Oka, S. jinno, and M. Fujinami, "Analytical methods using a positron microprobe", Anal. Sci. 25, 837 (2009).
    • A. Uedono, K. Ito, H. Nakamori, S. Ata, T. Ougizawa, K. Ito, Y. Kobayashi, X. Cao, T. Kurihara, N. Oshima, T. Ohdaira, R. Suzuki, T. Akahane, M. Doyama, K. Matsuya, S. Jinno and M. Fujinami, "Annihilation characteristics of positrons in free-standing thin metal and polymer films", Nucl. Instrum. Meth B, 266, 750 (2008).
    • M. Doyama, A. Kogure, M. Inoue, T. Kurihara, X. Cao, M. Matsuya, T. Yoshiie, Y. Hayashi, Q. Xu and M. Fujinami, "Transmission positron images using imaging plates", Appl. Surf. Sci. 255, 89 (2008).
    • M. Doyama, Y. Kogure, M. Inoue1, T. Kurihara, M. Matsuya, K. Tsuno, T. Yoshiie, and M. Fujinami, "Transmission positron images and microscopes", Phys. Stat. Sol. (c) 4, 3977 (2007).
    Beam Line
    • K. Wada, M. Maekawa, I. Mochizuki, T. Shidara, A. Kawasuso, M. Kimura, T. Hyodo, "A pulse stretcher for a LINAC-based pulsed slow-positron beam providing a quasi-continuous beam with an energy of 5.2 keV", Nuclear Inst. and Methods in Physics Research, A 975, 164161-1-7 (2020).
    • T. Hyodo, I. Mochizuki, K. Wada, N. Toge, T. Shidara, "Slow positron applications at Slow Positron Facility of Institute of Materials Structure Science, KEK", AIP Conference Proceedings 1970, 040004-1-10 (2018).
    • T. Hyodo, K. Wada, I. Mochizuki, M. Kimura1, N. Toge, T. Shidara, Y. Fukaya, M. Maekawa, A. Kawasuso, S. Iida, K. Michishio, Y. Nagashima, "Research progress at the Slow Positron Facility in the Institute of Materials Structure Science, KEK" J. Phys.: Conf. Ser. 791 (2017) 012003-1-8.
    • M. Maekawa, K. Wada, Y. Fukaya, A. Kawasuso, I. Mochizuki, T. Shidara, and T. Hyodo, "Brightness enhancement of a linac-based intense positron beam for total-reflection high-energy positron diffraction (TRHEPD)", Eur. Phys. J. D 68,165-1-6 (2014).
    • K. Wada, T. Hyodo, T. Kosuge, Y. Saito, M. Ikeda, S. Ohsawa, T. Shidara, K. Michishio, T. Tachibana, H. Terabe, R. H. Suzuki, Y. Nagashima, Y. Fukaya, M. Maekawa, I. Mochizuki, and A. Kawasuso, "New experiment stations at KEK Slow Positron Facility", J. Phys.: Conf. Ser. 443, 012082-1-6 (2013).
    • K. Wada, T. Hyodo, A. Yagishita, S. Ikeda. T. Ohsawa, T. Shidara,. MichishioT. TachibanaY. NagashimaY. FukayaM. MaekawaA. Kawasuso, "Increase in the beam intensity of the linac-based slow positron beam and its application at the Slow Positron Facility, KEK", Eur. Phys. J. D 66, 37-1-4 (2012).
    • T Hyodo, K Wada, A Yagishita, T Kosuge, Y Saito, T Kurihara, T Kikuchi, A Shirakawa, T Sanami, M Ikeda, S Ohsawa, K Kakihara and T Shidara, "KEK-IMSS Slow Positron Facility", J. Phys. Conf. Ser. 262, 012026-1-5 (2011).
    • M. Maekawa, K. Wada, A. Kawasuso, "Development a new positron source for spin-polarized positron beam generation", Nucl. Inst. Meth. Phys. Res. B 480, 49-55 (2020).
    • K. Yaji, S. Kim, I. Mochizuki, Y. Takeichi, Y. Ohtsubo, P. Le Fèvre, F. Bertran, A. Taleb-Ibrahimi, S. Shin and F. Komori, "One-dimensional metallic surface states of Pt-induced atomic nanowires on Ge (001)", J. Phys.: Condens. Matter 28, 284001-1-9 (2016).
    • F. Saito, T. Yotoriyama, I. Nishiyama, Y. Suzuki, A.Goto, Y. Nagashima and T. Hyodo, "Characterization of ion-irradiated poly-L-lactic acid using nano-cutting", Phys. Chem. Chem. Phys. 16, 26991 (2014).
    • K. Shibuya, T. Nakayama, H. Saito, and T. Hyodo, "Spin conversion and pick-off annihilation of ortho-positronium in gaseous xenon at elevated temperatures", Phys. Rev. A 88, 012511 (2013).
    • K. Wada and T. Hyodo, "A simple shape-free model for pore-size estimation with positron annihilation lifetime spectroscopy", J. Phys.: Conf. Ser. 443 012003 (2013).
    • K. Wada and T. Hyodo, "A simple shape-free model for pore-size estimation with positron annihilation lifetime spectroscopy", J. Phys.: Conf. Ser. 443 012003 (2013).
    • K. Wada, F. Saito, N. Shinohara, and T. Hyodo, "Pick-off quenching probability of ortho-positronium per collision with atoms and molecules", Eur. Phys. J. D, 66, 108 (2012).
    • K. Inoue, N. Suzuki, T. Hyodo, et al. "Delocalized positronium in BaF2", J. Phys. Soc. Jpn. 80, 054709 (2011).
    • K. Wada, F. Saito, and T. Hyodo, "Orthopositronium annihilation rates in gaseous halogenated methanes", Phys. Rev. A 81, 062719- (2010).

    • F. Saito, I. Nishiyama and T. Hyodo, "Cutting strength - A new indicator for the mechanical strength of materials", Mater. Lett. 66, 114 (2012).
    • F. Saito, Y. Nishiyama and T. Hyodo, "An improved method for the measurement of adhesion energy by using a nano-cutting machine", Surf. Coat. Tech. 205, 419 (2010).