We consider a cosmic-ray muon model in which a "directly produced" muon component with the same slope as the primary spectrum is added to the conventional pion-derived muons. It is found to be consistent with recent burst measurements, horizontalair-shower data, atmospheric gamma-ray fluxes, and muon spectrograph measurements. It may also explain the anomalous mu-less air showers. The model req...

We consider a highly unconventional approach to generating muon and antimuon bunches for a neutrino factory or muon collider: electronpositron annihilation just above muon-antimuon threshold. This approach can produce low-emittance bunches at high energy, easing the muoncooling and acceleration challenges in such facilities. However, the small (< 1μb) useable production cross section means that...

An effective analytical method for calculating energy spectra of cosmic-ray muons at large depths of homogeneous media is developed. The method allows to include an arbitrary (decreasing) muon spectrum at the medium boundary and the energy dependence of both discrete (radiative and photonuclear) and continuous (ionization) muon energy losses, with resonable requirements for the high-energy beha...

We have investigated the low-temperature physical properties of BaTi2Sb2O and Ba1−xNaxTi2Sb2O (x=0.05, 0.1, 0.15, 0.2, 0.25, 0.3) by means of muon spin rotation (�SR) and SQUID magnetometry. Our measurements reveal the absence of magnetic ordering below TDW=58 K in the parent compound. Therefore the phase transition at this temperature observed by magnetometry is most likely due to the formatio...

Narrow muon bundles in underground detectors permit to study muoproduction reactions that take place in the surrounding rock. We analyze the relevance of a QED+QCD reaction, muoproduction of “open charm”. The contribution to double muon events is estimated to be 4% of the one due to QED “trident” process, for an ideal detector located under a rock depth of 3 km water equivalent, and an observat...

Resonance lines broadened by dipolar interactions are a common phenomenon. The best studied cases are the nuclear magnetic resonance lines, for which Van Vleck's [ 1 ] classic analysis gives expressions for the moments of the shape. Recently work on muon spin resonance [2,3] stimulated questions of whether the linewidth depended on the number n of sites over which the muon moved coherently. Yao...

Results of the experimental project using ne| ive muon spin rotation at Lawrence Berkeley Laboratory are reported. The following ave been discussed briefly, i) The bound muon g factors from the viewpoints of the relativistic and nuclear polarization effects, ii) Strange depolarization phenomena in terms of the difference between the muonic-atom probe and its equivalent nuclear probe iii) Applic...

Much of the April 2004 to do list relating to FFAGs for muon physics, from the workshop held in Vancouver B.C., has been accomplished; either between the workshops or at this meeting. Activities were focused mostly on the few-MeV electron model of a multi-GeV muon accelerator intended for a Neutrino Factory[1] or Muon Collider; the PRISM[2] FFAG for a lepton-flavour violation experiment was als...

In view of their physics goals, future neutrino factories from muon decay aim at an overall flux precision of O(1%) or better. We analytically study the QED radiative corrections to the neutrino differential distributions from muon decay. Kinematic uncertainties due to the divergence of the muon beam are considered as well. The resulting corrections to the neutrino flux turn out to be of order ...

There has been some concern about the unexpected paucity of cosmic high-energy muon neutrinos in detectors probing the energy region beyond 1 PeV. As a possible solution we consider the possibility that some exotic neutrino property is responsible for reducing the muon neutrino flux at high energies from distant sources; specifically, we consider (i) neutrino decay and (ii) neutrinos being pseu...