Ultraslow Positive-Muon Generation by Laser Ionization of Thermal Muonium from Hot Tungsten at Primary Proton Beam

K. Nagamine; Y. Miyake; K. Shimomura; P. Birrer; J. P. Marangos; M. Iwasaki; P. Strasser; T. Kuga

doi:10.1103/PhysRevLett.74.4811

Ultraslow Positive-Muon Generation by Laser Ionization of Thermal Muonium from Hot Tungsten at Primary Proton Beam

K. Nagamine, Y. Miyake, K. Shimomura, P. Birrer, J. P. Marangos, M. Iwasaki, P. Strasser, and T. Kuga

Phys. Rev. Lett. 74, 4811 – Published 12 June 1995

Abstract

Thermal muonium (positive muon $μ^{+}$ and electron $e^{-}$ ) atoms were produced from the surface of a hot (2300 K) and high purity tungsten foil placed at the primary beam of 500 MeV pulsed protons. Resonant ionization $(1 s \to 2 p \to unbound)$ of the thermal muonium with pulsed laser sources was achieved with reference to thermal hydrogen isotopes (D and T) so as to produce a potentially intense ultraslow (as low as 0.2 eV) positive muon beam with an extremely narrow phase-space volume and high stopping density.

Received 27 September 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.4811

Authors & Affiliations

K. Nagamine^1,2, Y. Miyake¹, K. Shimomura¹, P. Birrer¹, J. P. Marangos^1,3, M. Iwasaki¹, P. Strasser^2,4, and T. Kuga⁵

¹Meson Science Laboratory, Faculty of Science, University of Tokyo (UT-MSL), Hongo, Bunkyo-ku, Tokyo 113, Japan
²Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01, Japan
³Blackett Laboratory, Imperial College of Science, Technology and Medicine, Prince Consort Road, London SW72BZ, United Kingdom
⁴Department of Quantum Engineering and System Science, Faculty of Engineering, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan
⁵Institute of Physics, College of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan