Measurement of the spectral flux density of negative muons at very low energies

Measurement of the stopping power of Au and MgF2 for slow muons

“…We have performed a corresponding experiment in 1985 with the highest-intensity beam available at that time, beam/ZE1 at SIN, now PSI, at Villigen, Switzerland. This experiment was similar to a previous experiment [1]. Muons of 54 MeV energy with an energy spread of 12.5 MeV (FWHM) leave the last quadrupole of the channel, pass through a scintillation counter telescope and a degrader and enter a magnetic monochromator.…”

“…MgF2 has a gap of 11 eV [4]. S = S(T) was measured indirectly using the relation [1] n(T) S(T) = const,…”

“…As the capture predominantly takes place at very low energies (< 100 eV) [1] and the capture process with the succeeding X-ray emission gives a signal of the stop, the/z-capture process and the energy loss of very slow heavy particles in matter can be studied. This energy loss may be described by the collision of "fast" electrons forming a Fermi gas with the slowly moving heavy particle.…”