Faculté des sciences

Muonic hydrogen cascade time and lifetime of the short-lived 2S

Ludhova, Livia ; Amaro, F. D. ; Antognini, A. ; Biraben, F. ; Cardoso, J. M. R. ; Conde, C. A. N. ; Dax, A. ; Dhawan, S. ; Fernandes, L. M. P. ; Hänsch, T. W. ; Hughes, V. W. ; Indelicato, P. ; Julien, L. ; Knowles, Paul E. ; Kottmann, F. ; Liu, Y.-W. ; Lopes, J. A. M. ; Monteiro, C. M. B. ; Mulhauser, Françoise ; Nez, F. ; Pohl, R. ; Rabinowitz, P. ; Santos, J. M. F. dos ; Schaller, Lukas A. ; Schwob, C. ; Taqqu, D. ; Veloso, J. F. C. A.

In: Physical Review A, 2007, vol. 75, p. 040501(R)

Metastable 2S muonic-hydrogen atoms undergo collisional 2S quenching, with rates which depend strongly on whether the µp kinetic energy is above or below the 2S -P energy threshold. Above threshold, collisional 2S -P excitation followed by fast radiative 2P -S deexcitation is allowed. The corresponding short-lived... Plus

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    Summary
    Metastable 2S muonic-hydrogen atoms undergo collisional 2S quenching, with rates which depend strongly on whether the µp kinetic energy is above or below the 2S -< 2P energy threshold. Above threshold, collisional 2S -< 2P excitation followed by fast radiative 2P -< 1S deexcitation is allowed. The corresponding short-lived µp(2S) component was measured at 0.6 hPa H₂ room-temperature gas pressure, with lifetime ***Missing image substitution*** 2Sshort=165 -29+38 ns (i.e., ***Missing image substitution*** 2Squench=7.9 -1.6+1.8×10¹² s⁻¹ at liquid-hydrogen density) and population ε 2Sshort=1.70 -0.56+0.80% (per µp atom). In addition, a value of the µp cascade time, T casmu p=(37±5) ns, was found.