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27 April 2024

» arxiv » nucl-ex/0302023

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Muon transfer from deuterium to helium
M. Augsburger ; P. Ackerbauer ; W.H. Breunlich ; M. Cargnelli ; D. Chatellard ; J.-P. Egger ; B. Gartner ; F.J. Hartmann ; O. Huot ; R. Jacot-Guillarmod ; P. Kammel ; R. King ; P. Knowles ; A. Kosak ; B. Lauss ; J. Marton ; M. Muehlbauer ; F. Mulhauser ; C. Petitjean ; W. Prymas ; L.A. Schaller ; L. Schellenberg ; H. Schneuwly ; S. Tresch ; T. von Egidy ; J. Zmeskal ;
Date:	19 Feb 2003
Journal:	Phys.Rev. A68 (2003) 022712
Subject:	nucl-ex
Abstract:	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 dmu3,4He* molecules and the excited state transfer from mud* were measured. The use of CCD 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 dmu3He* and dmu4He* molecules were measured with good statistics. For the D2+3He mixture, the peak has its maximum at E_dmu3He = 6768 +- 12 eV with FWHM Gamma_dmu3He = 863 +- 10 eV. Furthermore the radiative branching ratio was found to be kappa_dmu3He = 0.301 +- 0.061. For the D_2+4He mixture, the maximum of the peak lies at E_dmu4He = 6831 +- 8 eV and the FWHM is Gamma_dmu4He = 856 +- 10 eV. The radiative branching ratio is kappa_dmu4He = 0.636 +- 0.097. The excited state transfer is limited by the probability to reach the deuterium ground state, q_1s. This coefficient was determined for both mixtures: q^3He_1s = 68.9 +- 2.7% and q^4He_1s = 90.1 +- 1.5.
Source:	arXiv, nucl-ex/0302023
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