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Nathan L. Harshman 《International Journal of Theoretical Physics》2007,46(8):1929-1946
The notion that elementary systems correspond to irreducible representations of the Poincaré group is the starting point for
this paper, which then goes on to discuss how a semigroup for the time evolution of unstable states and resonances could emerge
from the underlying Poincaré symmetry. Important tools in this analysis are the Clebsch-Gordan coefficients for the Poincaré
group. 相似文献
10.
Dale R. Harshman 《Hyperfine Interactions》1986,32(1-4):847-863
The interactions of muonium (μ
+
e
−, Mu) with the surfaces of fine silica powders have been extensively studied using zero, longitudinal and transverse field
μSR techniques. These studies indicate diffusion and trapping behavior of the Mu atoms on the silica surface, which is strongly
influenced by the surface hydroxyl (OH) concentration. Specifically, the presence of the surface OH groups is observed to
inhibit the surface mobility of the Mu atoms at low temperatures. Information provided by zero and longitudinal field data
suggest a random anisotropic distortion of the Mu hyperfine interaction (RAHD) as the principal relaxation mechanism. A recently
developed RAHD spin relaxation theory is used to interpret these data. Additional investigations, using platinum loaded silica,
have yielded the first observed surface reaction of Mu.
Studies of the interactions of positive muons with surfaces have been also extended to single crystals, where low energy (<10
eV)μ
+ andMu
− ions are observed to be reemitted from some materials (e.g., the <100> surface of lithium fluoride). Future applications
of these emission phenomena toward the development of a slow847-3 (or Mu−) beam are considered. 相似文献