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Neutron and Muon instruments

Neutron instruments

High-intensity pulsed neutron beams are generated 25 times per second in the neutron source of the MLF. As the wavelength of neutrons is inversely proportional to the speed, it can be determined by the time-of-flight (TOF) technique, the method to measure time between the neutron is generated and detected. At the neutron instruments in the MLF, by combining the high-intensified neutron beams generated from the neutron source and the sophisticated measurement technique using TOF, experiment that will contribute to the state-of-the-art science and technology is being conducted day and night.

There are 23 neutron beamlines in the MLF, and currently instruments are installed to 21 beamlines shown below.

» Details for neutron experiment

Muon instruments

The muon source in the MLF MUSE (MUon Science Establishment) generates pions (π±) and “surface muons*” (μ+) as pulsed particle beams 25 times per second (pulse width: 0.1µs or shorter) by irradiating the graphite target with the 3-GeV proton beam to induce nuclear reaction with carbon. The pions are supplied to D line, and the surface muons are to U line and S line. At D line, energy-tunable positive/negative muons, which are produced by decay of pions in the superconducting solenoid beamline, are extracted as secondary beams and transported to instruments. The positive muons at U line is further reduced in energy to 103-4 eV before delivery to instruments. In the MLF currently four instruments are serving for the Inter-University-Research Program at D1, D2, U1, and S1 experimental areas. (The one at U1 is under commissioning).

*Positive muons with kinetic energy 4 MeV or lower that are obtained from decay of positive pions stopping near the surface of the graphite target.

In the MLF currently 4 instruments are installed to 3 beamlines. (One of them is in commissioning)

» Details for muon experiment

Layout of Instruments & Features

BL01 BL02 BL03 BL04 BL05 BL06 BL08 BL09 BL10 BL11 BL12 BL14 BL15 BL16 BL17 BL18 BL19 BL20 BL21 BL22 BL23 U1 D2 D1 D1 D2 U1A BL23 BL22 BL21 BL20 BL19 BL18 BL17 BL16 BL15 BL14 BL12 BL11 BL10 BL08 BL06 BL05 BL04 BL03 BL02 BL01 BL09