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Full-Text Articles in Physical Sciences and Mathematics
Study Of The Effect Of Relativistic Time Dilation On Cosmic Ray Muon Flux - Undergraduate Modern Physics Experiment, Nalini Easwar, Douglas A. Macintire
Study Of The Effect Of Relativistic Time Dilation On Cosmic Ray Muon Flux - Undergraduate Modern Physics Experiment, Nalini Easwar, Douglas A. Macintire
Physics: Faculty Publications
An experiment to study the effect of relativistic time dilation on secondary muon fluxes observed at different altitudes is described in this article. Muons, produced as secondary particles from the interaction of primary cosmic rays with the upper atmosphere, form a natural and abundant source of subatomic ``clocks'' moving at very high speeds. The measured muon flux on a mountain relative to that measured at sea level can be compared to predictions from calculations that take into account the relativistic time dilation in the muon frame. Situations under which such an experiment can be successfully performed are explored with a …
Systematic Variation Of Transport And Thermodynamic Properties With Degree Of Reduction In Nd1.85ce0.15cuo4-, Nathanael A. Fortune, K. Murata, M. Ishibashi, Y. Yokoyama, Y. Nishihara
Systematic Variation Of Transport And Thermodynamic Properties With Degree Of Reduction In Nd1.85ce0.15cuo4-, Nathanael A. Fortune, K. Murata, M. Ishibashi, Y. Yokoyama, Y. Nishihara
Physics: Faculty Publications
Superconductivity only occurs in Nd1.85Ce0.15CuO4- after heat treatment in a reducing at- mosphere; yet we find the oxygen loss during reduction to be remarkably small. To better understand the physical role of reduction, we have systematically varied the degree of reduction in a series of ceramic samples by varying the partial pressures of oxygen and argon in the reducing atmosphere, keeping the total pressure constant. We find that small increases in the degree of reduction strongly increase the apparent carrier density and the superconducting Meissner fraction. We also find that there is an optimal degree of reduction to produce a …