/ Experiment-Nucl nucl-ex/0312018

Experimental study of mu atomic and mu molecular processes in pure helium and deuterium helium mixtures

Bystritsky, V.M. (Fribourg U.) ; Boreiko, V.F. (Fribourg U.) ; Czaplinski, W. (Fribourg U.) ; Filipowicz, M. (Fribourg U.) ; Gerasimov, V.V. (Fribourg U.) ; Huot, O. (Fribourg U.) ; Knowles, P.E. (Fribourg U.) ; Mulhauser, F. (Fribourg U.) ; Pavlov, V.N. (Fribourg U.) ; Popov, N.P. (Fribourg U.) ; Schaller, L.A. (Fribourg U.) ; Schneuwly, H. (Fribourg U.) ; Sandukovsky, V.G. (Fribourg U.) ; Stolupin, V.A. (Fribourg U.) ; Volnykh, V.P. (Fribourg U.) ; Wozniak, J. (Fribourg U.)

Pages: 15

Abstract: We present experimental results of $\mu$--atomic and $\mu$--molecular processes induced by negative muons in pure helium and helium--deuterium mixtures. The experiment was performed at the Paul Scherrer Institute (Switzerland). We measured muonic x--ray $K$ series transitions relative intensities in $(\mu{}^{3,4}\mathrm{He})^*$ atoms in pure helium as well as in helium--deuterium mixture. The muon stopping powers ratio between helium and deuterium atoms and the $d \mu{}^3 \mathrm{He}$ radiative decay probability of for two different helium densities in $\mathrm{D}_2 + {}^3\mathrm{He}$ mixture were also determined. Finally, the $\mathrm{q}_{1s}^{\mathrm{He}}$ probability for a $d\mu$ atom formed in an excited state to reach the ground state was measured and compared with theoretical calculations using a simple cascade model.

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 Record created 2010-10-28, last modified 2014-01-30

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