Scattering of p$μ$ muonic atoms in solid hydrogen

Details Scattering of p$μ$ muonic atoms in solid hydrogen Scattering of p$μ$ muonic atoms in solid hydrogen

2002-12-06

arxiv.org/abs/nucl-ex/0212005v2

Physics

Nuclear Physics

Nuclear Experiment

revtex4, 15 pages, 19 figures, 6 tables, submitted to PRA, revised

Scientific paper

10.1103/PhysRevA.68.062502

We present the results of experimental and theoretical study of the scattering of low energy p$\mu$ atoms in solid hydrogen cooled to 3 K. The resulting emission of low energy p$\mu$ atoms from the hydrogen layer into the adjacent vacuum was much higher than that predicted by calculations which ignored the solid nature of the hydrogen. New differential scattering cross sections have been calculated for the collisions of p$\mu$ atoms on solid hydrogen to acount for its quantum crystalline nature. Analysis of the experimental data performed using such cross sections shows the important role of the coherent scattering in p$\mu$ atom diffusion. For p$\mu$ energies lower than the Bragg cutoff limit (2 meV) the elastic Bragg scattering vanishes which makes the total scattering cross section fall by several orders of magnitude, and thus the hydrogen target becomes transparent allowing the emission of cold p$\mu$ atoms to occur.

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