RIKEN-RAL Muon Group
20 Aug 2009



The RIKEN-RAL Muon Facility uses beams of positive and negative muons for a variety of condensed matter and molecular studies, together with atomic and nuclear physics investigations.


​​​​​​Diagram of the RIKEN-RAL Muon Facility at ISIS 



Main Contact

Other Contact

  • Dr Isao Watanabe
  • Dr Katsu Ishida
  • Dr Adrian Hillier

The RIKEN-RAL Muon facility (diagram, right)​ was constructed by RIKEN at Rutherford Appleton Laboratory in the UK through the RIKEN Nishina Centre for Accelerator Based Science. It is now owned and operated by ISIS in partnership with RIKEN and with a continuing user programme for Japanese researchers. 

The facility utilizes intense pulsed proton beam provided by the ISIS synchrotron accelerator. Thanks to a unique superconducting solenoid in our beam line, the facility produces a strong​ source of backward decay pulsed mu+ or mu- in the momentum range from 20 MeV/c​ to 120 MeV/c as well as surface mu+ at 30MeV/c. A pulsed magnetic kicker is used to split the double-pulsed structure of the muon beam, enabling us to execute two experimens simultaneously in different beam areas. Important research activities such as fundamental and applied science using muonic atoms and studies of condensed matter by muon spin rotation/relaxation/resonance are actively pursued.


RIKEN-RAL Muon Group members have a wide variety of expertise, in areas such as:

  • condensed matter and molecular physics
  • muon technique development
  • muon beamline and spectrometer design
  • low-energy muon production
  • muon catalysed fusion
  • atomic and nuclear physics studies using muons
  • elemental analysis using muons