Diepold, Marc Amaro, Fernando D. Antognini, Aldo Biraben, François Cardoso, João M. R. Covita, Daniel S. Dax, Andreas Dhawan, Satish Fernandes, Luis M. P. Giesen, Adolf Gouvea, Andrea L. Graf, Thomas Hänsch, Theodor W. Indelicato, Paul Julien, Lucile Kao, Cheng-Yang Knowles, Paul E. Kottmann, Franz Bigot, Eric-Olivier Le Liu, Yi-Wei Lopes, José A. M. Ludhova, Livia Monteiro, Cristina M. B. Mulhauser, Françoise Nebel, Tobias Nez, François Rabinowitz, Paul Santos, Joaquim M. F. dos Schaller, Lukas A. Schuhmann, Karsten Schwob, Catherine Taqqu, David Veloso, João F. C. A. Vogelsang, Jan Pohl, Randolf CREMA Collaboration-,- 2013-10-31 Radiative deexcitation (RD) of the metastable 2<i>S</i> state of muonic hydrogen and deuterium atoms has been observed. In muonic hydrogen, we improve the precision on lifetime and population (formation probability) values for the short-lived <i>μ</i><i>p</i>(2<i>S</i>) component, and give an upper limit for RD of long-lived <i>μ</i><i>p</i>(2<i>S</i>) atoms. In muonic deuterium at 1 hPa, 3.1±0.3% of all stopped muons form <i>μ</i><i>d</i>(2<i>S</i>) atoms. The short-lived 2<i>S</i> component has a population of 1.35 _−0.33^+0.57% and a lifetime of <i>τ</i>_2<i>S</i>^short(<i>μ</i><i>d</i>)=138 ₋₃₄⁺³² ns. We see evidence for RD of long-lived <i>μ</i><i>d</i>(2<i>S</i>) with a lifetime of <i>τ</i>_2<i>S</i>^long(<i>μ</i><i>d</i>)=1.15 _−0.53^+0.75<i>μ</i>s. This is interpreted as formation and decay of excited muonic molecules. application/pdf https://folia.unifr.ch/global/documents/303303 https://folia.unifr.ch/documents/303303/files/kno_lps.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevA.88.042520 info:eu-repo/semantics/openAccess License undefined Physical Review A. - 2013, vol. 88, no. 4, p. 042520 info:eu-repo/classification/udc/53 Lifetime and population of the 2S state in muonic hydrogen and deuterium http://purl.org/coar/resource_type/c_6501