dorsal/arxiv
View SchemaMuonic hydrogen cascade time and lifetime of the short-lived $2S$ state
| Authors | L. Ludhova, F. D. Amaro, A. Antognini, F. Biraben, J. M. R. Cardoso, C. A. N. Conde, A. Dax, S. Dhawan, L. M. P. Fernandes, T. W. Haensch, V. W. Hughes, P. Indelicato, L. Julien, P. E. Knowles, F. Kottmann, Y. -W. Liu, J. A. M. Lopes, C. M. B. Monteiro, F. Mulhauser, F. Nez, R. Pohl, P. Rabinowitz, J. M. F. dos Santos, L. A. Schaller, C. Schwob, D. Taqqu, J. F. C. A. Veloso |
|---|---|
| Categories | |
| ArXiv ID | physics/0611121 |
| URL | https://arxiv.org/abs/physics/0611121 |
| DOI | 10.1103/PhysRevA.75.040501 |
Abstract
Metastable ${2S}$ muonic-hydrogen atoms undergo collisional ${2S}$-quenching, with rates which depend strongly on whether the $\mu p$ kinetic energy is above or below the ${2S}\to {2P}$ energy threshold. Above threshold, collisional ${2S} \to {2P}$ excitation followed by fast radiative ${2P} \to {1S}$ deexcitation is allowed. The corresponding short-lived $\mu p ({2S})$ component was measured at 0.6 hPa $\mathrm{H}_2$ room temperature gas pressure, with lifetime $\tau_{2S}^\mathrm{short} = 165 ^{+38}_{-29}$ ns (i.e., $\lambda_{2S}^\mathrm{quench} = 7.9 ^{+1.8}_{-1.6} \times 10^{12} \mathrm{s}^{-1}$ at liquid-hydrogen density) and population $\epsilon_{2S}^\mathrm{short} = 1.70^{+0.80}_{-0.56}$ % (per $\mu p$ atom). In addition, a value of the $\mu p$ cascade time, $T_\mathrm{cas}^{\mu p} = (37\pm5)$ ns, was found.
{
"annotation_id": "9810338b-940f-4842-82f5-53310a05b10a",
"date_created": "2026-03-02T18:01:14.744000Z",
"date_modified": "2026-03-02T18:01:14.744000Z",
"file_hash": "dcd38a6a3647f3a02673fcaa6876b500d69c4faf98ecb0fb3bf42b8c5fe82667",
"private": false,
"record": {
"abstract": "Metastable ${2S}$ muonic-hydrogen atoms undergo collisional ${2S}$-quenching,\nwith rates which depend strongly on whether the $\\mu p$ kinetic energy is above\nor below the ${2S}\\to {2P}$ energy threshold. Above threshold, collisional\n${2S} \\to {2P}$ excitation followed by fast radiative ${2P} \\to {1S}$\ndeexcitation is allowed. The corresponding short-lived $\\mu p ({2S})$ component\nwas measured at 0.6 hPa $\\mathrm{H}_2$ room temperature gas pressure, with\nlifetime $\\tau_{2S}^\\mathrm{short} = 165 ^{+38}_{-29}$ ns (i.e.,\n$\\lambda_{2S}^\\mathrm{quench} = 7.9 ^{+1.8}_{-1.6} \\times 10^{12}\n\\mathrm{s}^{-1}$ at liquid-hydrogen density) and population\n$\\epsilon_{2S}^\\mathrm{short} = 1.70^{+0.80}_{-0.56}$ % (per $\\mu p$ atom). In\naddition, a value of the $\\mu p$ cascade time, $T_\\mathrm{cas}^{\\mu p} =\n(37\\pm5)$ ns, was found.",
"arxiv_id": "physics/0611121",
"authors": [
"L. Ludhova",
"F. D. Amaro",
"A. Antognini",
"F. Biraben",
"J. M. R. Cardoso",
"C. A. N. Conde",
"A. Dax",
"S. Dhawan",
"L. M. P. Fernandes",
"T. W. Haensch",
"V. W. Hughes",
"P. Indelicato",
"L. Julien",
"P. E. Knowles",
"F. Kottmann",
"Y. -W. Liu",
"J. A. M. Lopes",
"C. M. B. Monteiro",
"F. Mulhauser",
"F. Nez",
"R. Pohl",
"P. Rabinowitz",
"J. M. F. dos Santos",
"L. A. Schaller",
"C. Schwob",
"D. Taqqu",
"J. F. C. A. Veloso"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.75.040501",
"title": "Muonic hydrogen cascade time and lifetime of the short-lived $2S$ state",
"url": "https://arxiv.org/abs/physics/0611121"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "8df8d297-9da8-4aa8-b1cd-79d2fc688520",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}