K. Ninomiya

Development of elemental analysis by muonic X-ray measurement in J-PARC

Muon irradiation and muonic X-ray detection can be applied to non-destructive elemental analysis. In this study, in order to develop the elemental analysis by muonic X-ray measurement we constructed a new X-ray measuring system in J-PARC muon facility. We performed muon irradiation for Tempo-koban (Japanese old coin) for test experiment of elemental analysis. Muonic X-rays originating from muon transition in muonic silver and gold atoms were identified. The contents of Tempo-koban (Au:56%) was determined by muonic X-ray intensities.

J-PARC decay muon channel construction status

The new Muon Science Facility (MUSE) that is now under construction at J-PARC in the Materials and Life Science Facility (MLF) building will comprise four types of muon channels. In the first stage, a conventional superconducting decay muon channel (D-Line) was constructed, which can extract surface (positive) muons with an expected muon yield of 107/s and decay positive/negative muons up to 120 MeV/c, with an expected muon yield of a few 106/s at 60 MeV/c for both positive and negative muons. This channel will be used for various kinds of muon experiments like ?SR, muon catalyzed fusion and nondestructive elements analysis.

The Development of a Non-Destructive Analysis System with Negative Muon Beam for Industrial Devices at J-PARC MUSE

Motonobu Tampo1, Kouji Hamada1, Naritoshi Kawamura1, Makoto Inagaki2, Takashi U. Ito3, Kenji M. Kojima1, Kenya M. Kubo4, Kazuhiko Ninomiya2, Patrick Strasser1, Go Yoshida2 and Yasuhiro Miyake1 1Institute of Materials Structure Science, KEK, Tokai, Ibaraki 319-1195, Japan 2Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama Toyonaka, Osaka, 560-0043 Japan 3Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Naka, Ibaraki, 319-1195, Japan 4International Christian University, Mitaka, Tokyo, 181-8585, Japan

J-PARC muon facility, MUSE

The muon science facility (MUSE, abbreviation of MUon Science Establishment), along with the neutron, hadron, and neutrino facilities, is one of the experimental areas of the J-PARC project, which was approved for construction in a period from 2001 to 2008. The MUSE facility is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. Construction of the MLF building was started in the beginning of 2004, and was completed at the end of the 2006 fiscal year. For Phase 1, we managed to install one super-conducting decay/surface muon channel with a modest-acceptance (about 45 mSr) pion injector in the summer of 2008. Finally, on September 19th, 2008, the 20 mm thick edge-cooled, non-rotating graphite target, which is surrounded by a copper frame, was, for the first time, placed into the 3GeV proton beam obtained from the rapid cycling synchrotron (RCS). The nuclear reactions between the 3 GeV proton beam and the nucleus of carbon produce both positively (π+) and negatively (π−) charged pions. On September 26th, 2008, we finally succeeded to extract? surface muons (μ+), which are obtained from the decay of π+ near the surface of the pion production target in the proton beam line. First, we commissioned the secondary muon beam line optics by tuning the superconducting magnet, the quadrupole and bending magnets, and the DC separator in order to optimize the transport of the surface muon beam and to eliminate the e+ contamination. Then, on December 25th, 2008, we also succeeded in the extraction of the decay muons (μ+/μ-), which are obtained through the in-flight decay of π+/π−

JAEA-ASRC muon research at J-PARC MUSE

The Japan Atomic Energy Agency (JAEA)-Advanced Science Research Center (ASRC) has developed experimental equipment at the J-PARC MLF muon science facility (MUSE) for muon spin rotation/relaxation experiments. We have extracted part of the muon beam into a muon spectrometer constructed downstream from the Decay/Surface muon beam line. The current status of our project is discussed here.

Strongest Pulsed Muon Source at J-PARC MUSE

The muon science facility (MUSE, abbreviation of MUon Science Establishment ), along with the neutron, hadron, and neutrino facilities, is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. On the November, 2009 beam cycle, we achieved extraction of the world’s strongest pulsed muon beam at J‐PARC MUSE by beam tuning at the Decay‐Surface muon beam line (D‐line). Surface muons (μ+) as much as 1.8×106/s were extracted with the use of 120 kW of protons from the Rapid Cycle Synchrotron (RCS), which corresponds to 1.5×107/s surface muons when a future proton beam reached at the intensity of 1MW. These intensities, at the future 1 MW operation, will correspond to more than ten times those at the RIKEN‐RAL Muon facility.