Thermal muonium in vacuo from silica aerogels

Schwarz, Winfried H.; Ebert, Volker; Geerds, H.; Jungmann, Klaus-Peter; Kirches, S; Koppe, S; Maas, F. E.; Mundinger, H. J.; Putlitz, G. zu; Rosenkranz, J.; Schäfer, Wolfgang; Schiff, G.; Zhang, Z.; Boshier, M. G.; Hughes, V. W.

doi:10.1016/s0022-3093(05)80465-x

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…70 For typical µ + beam momentum bite ∆p/p = 5 % typical average yields of up to 2-5 % have been achieved in precision experiments. 71 For this the targets had to be replaced twice a week. 33 SiO 2 powder targets have been employed for a number of precision experiments on M, including searches for MM conversion 33,72 and laser spectroscopic measurements of ∆ν 1s2s .…”

Section: Muonium Productionmentioning

confidence: 99%

“…[73][74][75][76] (v) M atoms have been produced in SiO 2 aerogel targets. 71 A fraction of the atoms has been observed to leave the SiO 2 aerogel into the surrounding vacuum, if the stopping of the µ + beam occurs close to the target surface. The yield of M in vacuum has been found to increase for an increased area of the SiO 2 target surface.…”

Section: Muonium Productionmentioning

confidence: 99%

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Precision Muonium Spectroscopy

Jungmann

2016

J. Phys. Soc. Jpn.

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The muonium atom is the purely leptonic bound state of a positive muon and an electron. It has a lifetime of 2.2 $\mu$s. The absence of any known internal structure provides for precision experiments to test fundamental physics theories and to determine accurate values of fundamental constants. In particular groun dstate hyperfine structure transitions can be measured by microwave spectroscopy to deliver the muon magnetic moment. The frequency of the 1s-2s transition in the hydrogen-like atom can be determined with laser spectroscopy to obtain the muon mass. With such measurements fundamental physical interactions, in particular Quantum Electrodynamics, can also be tested at highest precision. The results are important input parameters for experiments on the muon magnetic anomaly. The simplicity of the atom enables further precise experiments, such as a search for muonium-antimuonium conversion for testing charged lepton number conservation and searches for possible antigravity of muons and dark matter.Comment: accepted for JPS

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Section: Muonium Productionmentioning

confidence: 99%

Section: Muonium Productionmentioning

confidence: 99%

Precision Muonium Spectroscopy

Jungmann

2016

J. Phys. Soc. Jpn.

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“…For aging, the obtained alcogel was placed into the mixture ratio of 1:1, of water/isopropanol and incubated at 50˚C for 24 h. In order to prevent the reverse reaction during the modification, the isopropanol into the alcogel was replaced by hexane as a nonpolar solvent. For this, the alcogel was maintained in the hexane solution at 36˚C for 48 h [24]. The modification was Fig.…”

Section: Preparation and Modification Of The Adsorbentmentioning

confidence: 99%

Removal of copper (II) and nickel (II) from aqueous media using silica aerogel modified with amino propyl triethoxysilane as an adsorbent: equilibrium, kinetic, and isotherms study

Faghihian

Nourmoradi

Maryam

2014

Desalination and Water Treatment

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A B S T R A C TThis study focused on the adsorption of copper (II) and nickel (II) from aqueous solutions onto silica aerogel modified with amino propyl triethoxysilane as a compound containing amino functional group. The batch experiments were conducted at various conditions including contact time, pH, adsorbent dose, and adsorbate content. The results showed that the equilibrium time occurred within 5 h for Ni(II) and 24 h for Cu(II) and the maximum adsorption capacity for both the ions happened at a pH of 6. The kinetic and isotherm adsorption of the modified silica aerogel fitted well to pseudo-second order model and Langmuir model, respectively. The Langmuir isotherm model results showed that the maximum adsorption capacity (Q m ) of the modified adsorbent was 47.6 mg/g for Cu(II) and 27.7 mg/g for Ni(II). Experimental data analysis by Dubinin-Radushkevich isotherm also illustrated that the metals adsorption onto the sorbent was physical in nature. With regard to the sorption capacity obtained by the modified silica aerogel, it can be considered as an efficient sorbent in the removal of the metal ions.

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“…Actually, there was a report of a measurement with silica aerogels in 1992 [22] but the efficiency was typically several times smaller than with silica powder. It is suspected that the network of grains is destroyed during the drying process of the aerogel and that may have prevented diffusion of muonium.…”

Section: Muonium Production Developmentmentioning

confidence: 99%