Details

Autor(en) / Beteiligte

• Augsburger, M.
• Ackerbauer, P.
• Breunlich, W. H.
• Cargnelli, M.
• Chatellard, D.
• Egger, J.-P.
• Gartner, B.
• Hartmann, F. J.
• Huot, O.
• Jacot-Guillarmod, R.
• Kammel, P.
• King, R.
• Knowles, P.
• Kosak, A.
• Lauss, B.
• Marton, J.
• Mühlbauer, M.
• Mulhauser, F.
• Petitjean, C.
• Prymas, W.
• Schaller, L. A.
• Schellenberg, L.
• Schneuwly, H.
• Tresch, S.
• von Egidy, T.
• Zmeskal, J.

Titel

Muon transfer from deuterium to helium

Ist Teil von

• Physical review. A, Atomic, molecular, and optical physics, 2003-08, Vol.68 (2), Article 022712

Ort / Verlag

United States

Erscheinungsjahr

2003

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We report on an experiment at the Paul Scherrer Institute, Villigen, Switzerland measuring x rays from muon transfer from deuterium to helium. Both the ground-state transfer via the exotic (d{mu}{sup 3,4}He){sup *} molecules and the excited-state transfer from ({mu}d){sup *} were measured. The use of charge-coupled device detectors allowed x rays from 1.5 keV to 11 keV to be detected with sufficient energy resolution to separate the transitions to different final states in both deuterium and helium. The x-ray peaks of the (d{mu}{sup 3}He){sup *} and (d{mu}{sup 4}He){sup *} molecules were measured with good statistics. For the D{sub 2}+{sup 3}He mixture, the peak has its maximum at E{sub d{mu}}{sub {sup 3}He}=6768{+-}12 eV with full width at half maximum (FWHM) {gamma}{sub d{mu}}{sub {sup 3}He}=863{+-}10 eV. Furthermore, the radiative branching ratio was found to be {kappa}{sub d{mu}}{sub {sup 3}He}=0.301{+-}0.061. For the D{sub 2}+{sup 4}He mixture, the maximum of the peak lies at E{sub d{mu}}{sub {sup 4}He}=6831{+-}8 eV and the FWHM is {gamma}{sub d{mu}}{sub {sup 4}He}=856{+-}10 eV. The radiative branching ratio is {kappa}{sub d{mu}}{sub {sup 4}He}=0.636{+-}0.097. The excited-state transfer is limited by the probability to reach the deuterium ground state, q{sub 1s}. This coefficient was determined for both mixtures: q{sub 1s}{sup {sup 3}He}=68.9{+-}2.7% and q{sub 1s}{sup {sup 4}He}=90.1{+-}1.5%.