ZIB

1

Electronic Resource

Frictional cooling: Latest experimental results (1996)

Mühlbauer, M. ; Brunnhuber, A. ; Daniel, H. ; [et al.]

Springer

Hyperfine interactions 101-102 (1996), S. 607-612

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ISSN: 1572-9540

Keywords: beam cooling ; slow muon production ; accelerators

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Frictional cooling — that is cooling a beam of very low-energetic charged particles by moderation in matter and simultaneous acceleration in an electrostatic field — has been shown to be feasible during our experiments in 1994/1995 at PSI. In agreement with our previous closed-form and Monte Carlo calculations we found a significant increase in spectral density and a decrease in the angular spread in the case of a beam of negative muons.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02227673

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2

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Muon transfer from ground state deuterium to helium nuclei and its temperature dependence (1999)

Gartner, B. ; Ackerbauer, P. ; Augsburger, M. ; [et al.]

Springer

Hyperfine interactions 119 (1999), S. 103-108

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ISSN: 1572-9540

Keywords: muon transfer ; exotic atom ; muonic molecule

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The energy and time distributions of the decay X-rays of excited, metastable, molecular (dµHe)*-resonances were measured. The comparison of the observed energy spectra with calculated ones suggests that decay from the rotational state J = 1 dominates at the investigated conditions. The muon transfer rates from ground state deuterium to the helium isotopes 3He and 4He at low temperatures were determined from the time distributions of these spectra. Additionally, the temperature dependence of the muon transfer rate was clearly established in deuterium / 4He mixtures.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1012614804343

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3

Electronic Resource

Muon transfer from protium to helium isotopes at low temperature (1999)

Tresch, S. ; Ackerbauer, P. ; Augsburger, M. ; [et al.]

Springer

Hyperfine interactions 119 (1999), S. 109-114

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ISSN: 1572-9540

Keywords: exotic atoms ; transfer rates ; protium ; q 1s He

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The transfer reaction of negative muons from muonic protium to 3 and 4 in binary and triple gas mixtures was studied. In the binary mixtures the transfer rates to the two helium isotopes were determined from the time distribution of the 7-keV X-rays of the intermediate muonic molecule (pµHe)*. The experimental transfer rate to 4 is in good agreement with theoretical predictions, whereas the rate to 3 is a factor 2 to 3 smaller than the predicted ones. Radiative branching ratios of the (pµHe)8 molecular decay were obtained. Muon transfer from excited states of muonic protium gives the main contribution to the total intensity of the µHe Lyman series in the binary mixtures. Values of q 1s He are determined.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1012666821181

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4

Electronic Resource

Kinetic energies of exotic H atoms at formation and cascade (1999)

Kottmann, F. ; Daniel, H. ; Hartmann, F.J. ; [et al.]

Springer

Hyperfine interactions 119 (1999), S. 3-10

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ISSN: 1572-9540

Keywords: exotic atom ; cascade

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The complex balance of processes occurring at the cascade of exotic H-atoms is usually described by the so-called standard cascade model, but this model neglects variations of the kinetic energy T of the exotic atom during the cascade which are crucial for the analysis of several important experiments. New experimental results on T µp at H2 pressures between 0.063 and 4 hPa demonstrate the importance of acceleration due to Coulomb de-excitation processes at highly excited µp levels n 〉 9. The data at the lowest density are sensitive to the initial values of the kinetic energy and n-levels at the moment of atomic capture. From the measured low-energy tail of the T µp-distribution it can be concluded that a considerable part of the µp(2s) atoms is metastable at pressures of a few hPa.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1012651231659

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5

Electronic Resource

Frictional cooling: Experimental results (1999)

Mühlbauer, M. ; Daniel, H. ; Hartmann, F.J. ; [et al.]

Springer

Hyperfine interactions 119 (1999), S. 305-310

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ISSN: 1572-9540

Keywords: beam cooling ; slow muon production ; accelerators

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The classical methods used in beam cooling are hard to be adapted for a beam of short-lived elementary particles. A novel method, the so-called frictional cooling – that is cooling a beam of low-energy charged particles by moderation in matter and acceleration in an electrostatic field – has been shown to be feasible. In our experiments performed in 1994/1995 a beam of short-lived particles was cooled for the first time ever. Utilizing frictional cooling on a beam of slow negative muons we observed increase in phase space density by about one order of magnitude.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1012624501134

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6

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Muon catalyzed fusion in deuterium gas (1999)

Petitjean, C. ; Balin, D.V. ; Breunlich, W.H. ; [et al.]

Springer

Hyperfine interactions 118 (1999), S. 127-133

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ISSN: 1572-9540

Keywords: exotic atom ; muonic molecule

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We present the results of an experiment performed at PSI to investigate muon catalyzed fusion in pure deuterium gas of 5% density (LHD) at temperatures ranging from 28 K to 350 K. Using a new high pressure ionization chamber the reactions dd → n + 3He and dd → p+t were observed with 100% detection efficiency. The rates of dμd formation were measured with the absolute precision of 1% and the μd spin-flip rates with 0.5%. The temperature dependence of molecular formation and spin-flip rates display pronounced resonance structures. A preliminary fit based on the Vesman mechanism of resonant muonic molecule formation was carried out yielding a dd fusion rate of 3.5·108 s-1 and a hfs splitting energy $$\delta \varepsilon _{d\mu d} $$ of 24.3 meV, both in good agreement with the theory.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1012644821665

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