First observation of spin flip in dμ-atoms via formation and back decay of ddμ molecules |
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| Authors: | N.I. Voropaev D.V. Balin W.N. Breunlich T. Case K.M. Crowe H. Daniel V.A. Ganzha B. Gartner F.J. Hartmann P. Kammel S.M. Kozlov B. Lauss E.M. Maev V.E. Markushin Yu.A. Misko M. Mühlbauer C. Petitjean G.E. Petrov W. Prymas G.N. Schapkin W. Schott G.G. Semenchuk Yu.V. Smirenin V.A. Trofimov A.A. Vasiliev A.A. Vorobyov J. Zmeskal |
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| Affiliation: | (1) Petersburg Nuclear Physics Institute (PNPI), Gatchina, 188350, Russia;(2) Austrian Academy of Sciences, A-1090 Vienna, Austria;(3) University of California and LBNL, Berkeley, CA 94720, USA;(4) Technical University of Munich (TUM), D-85747 Garching, Germany;(5) Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland |
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| Abstract: | We present the results of precision measurements of dμ spin-flip rates in pure D2, in pure HD gas, and in the non-equilibrium and equilibrium H2+D2 gas mixtures. The experiments were performed at PSI in 1994-1996 using the high pressure ionization chamber from Gatchina as a 100% efficient detector of the charged fusion products. The measurements have been carried out in the temperature range 28-300 K, at gas density of 5% of LHD. In pure deuterium, the measured temperature dependence of the spin-flip rate allowed us to separate the two components (resonant and non-resonant) of the spin-flip processes. From the experiments in H/D mixtures we have measured the non-resonant spin-flip rate in collisions of dμ-atoms with HD molecules. Comparison with the theory revealed considerable disagreement in the case of non-resonant spin-flip in collisions of the dμ-atoms with D2 molecules. This revised version was published online in August 2006 with corrections to the Cover Date. |
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