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Muon transfer from protium to helium isotopes at low temperature |
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| Authors: | S Tresch P Ackerbauer M Augsburger WH Breunlich M Cargnelli D Chatellard J-P Egger T von Egidy B Gartner FJ Hartmann R Jacot-Guillarmod E Jeannet R King B Lauss J Marton M Mühlbauer F Mulhauser C Petitjean C Piller W Prymas LA Schaller L Schellenberg H Schneuwly W Schott Y-A Thalmann A Werthmüller J Zmeskal |
| Institution: | (1) Institut de Physique, Université de Fribourg, Pérolles, CH-1700 Fribourg, Switzerland;(2) Institute for Medium Energy Physics of Austrian Academy of Science, A-1090 Wien, Austria;(3) Institut de Physique de l' Université, CH-2000 Neuchatel, Switzerland;(4) Physik Department, TU München, D-85747 Garching, Germany;(5) Paul Scherrer Institut, CH-5232 Villigen, Switzerland |
| Abstract: | The transfer reaction of negative muons from muonic protium to 3 and 4 in binary and triple gas mixtures was studied. In the binary mixtures the transfer rates to the two helium isotopes were determined from the time distribution of the 7-keV X-rays of the intermediate muonic molecule (pµHe)*. The experimental transfer rate to 4 is in good agreement with theoretical predictions, whereas the rate to 3 is a factor 2 to 3 smaller than the predicted ones. Radiative branching ratios of the (pµHe)8 molecular decay were obtained. Muon transfer from excited states of muonic protium gives the main contribution to the total intensity of the µHe Lyman series in the binary mixtures. Values of q 1s He are determined. |
| Keywords: | exotic atoms transfer rates protium q 1s He |
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