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Kravtsov, Andrey V.; Михайлов, А. И.; Михайлов, И. В.; Ponomarev, L. I.

doi:10.1023/a:1020854901941

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…According to our knowledge, a fully quantum mechanical calculations of the cross sections of the chargeexchange process and the external Auger reaction with the formation and subsequent decomposition of the intermediate molecular complex is currently lacking. Estimates of the cross sections (rates) of these processes (e.g., see [26,27,54] and references therein) allow us to conclude that their role in the kinetics of atomic cascade is insignificant in comparison with the direct Coulomb de-excitation and Auger ionization of the target atom. Thus, the above mentioned processes are not taken into account in the present version of the ESCM.…”

Section: Cascade Processesmentioning

confidence: 99%

Isotopic effects in scattering and kinetics of the atomic cascade of excited μ−p and μ−d atoms

Popov

Pomerantsev

2017

Phys. Rev. A

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The isotopic effects in the scattering and the kinetics of the atomic cascade of excited µ − p and µ − d atoms The quantum-mechanical calculations of the differential and integrated cross sections of the elastic scattering, Stark transitions, and Coulomb de-excitation at collisions of excited µ − p and µ − d atoms with hydrogen isotope atoms in the ground state are performed. The scattering processes are treated in a unified manner in the framework of the close-coupling approach. The used basis includes both open and closed channels corresponding to all exotic atom states with principal quantum numbers from n = 1 up to nmax = 20. The energy shifts of ns states due to electron vacuum polarization and finite nuclear size are taken into account. The kinetics of atomic cascade of µ − p and µ − d atoms are studied in a wide range of relative target densities (ϕ = 10 −8 − 1) within the improved version of the extended cascade model, in which the results of the numerical quantum-mechanical calculations of the cross sections for quantum numbers and kinetic energies of muonic atoms, that are of interest for the detailed cascade calculations, are used as input data. Initial (n, l, E)-distributions of muonic atoms at the instant of their formation and the target motion are taken into account explicitly in present cascade calculations. The comparison of the calculated cross sections, the kinetic energy distributions of muonic atoms at the instant of their np → 1s radiative transitions as well as the absolute and relative x-ray yields for both muonic hydrogen and muonic deuterium reveals the isotopic effects, which, in principal, may be observed experimentally. The present results are mainly in very good agreement with experimental data available in the literature.PACS numbers: I. INTRODUCTIONThe muonic and hadronic hydrogen-like atoms (µ) are formed in highly-excited states, when a heavy negatively charged particle (µ − , π − , K − , etc.) is slowed down in the gaseous or liquid hydrogen target and captured on the atomic orbit. After the exotic atom formation, its initial distributions in quantum numbers and kinetic energy are changed during the so-called atomic cascade through a number of processes: radiative and Stark transitions, elastic scattering, external Auger effect, Coulomb de-excitation (CD), weak decay, and strong absorption in the case of hadronic atoms.The general features of these exotic atoms are similar to ones of ordinary hydrogen atoms, because their level structure is mainly determined by the static Coulomb interaction. However, due to significant differences of exotic particle and electron masses, the distance scale in the exotic atom case is much smaller, while the energy scale is much larger in comparison with the usual atomic scale. These scale effects make possible to realize the processes of external Auger effect and CD and open additional opportunities for study of the quantum electrodynamics, weak or strong interactions (in the case of hadronic atoms), and scattering processes in collisions of the...

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Section: Cascade Processesmentioning

confidence: 99%

Isotopic effects in scattering and kinetics of the atomic cascade of excited μ−p and μ−d atoms

Popov

Pomerantsev

2017

Phys. Rev. A

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“…The ®standard¯cascade model, in which initial µ-atom energies are distributed around E 0 = (1 − 2) eV, is apparently valid only at very low densities ϕ ≤ 10 −3 LHD. Now it is known that during the cascade muonic atoms can be both thermalized and accelerated getting the energy of even tens of eV (see, for example, [32,33,34]). However, till now the problem of knowing the initial energy distribution of muonic atoms after the cascade has not been solved deˇnitely.…”

Section: General Description Of the Processmentioning

confidence: 99%

“…First of all, for this purpose it is necessary to express q 1S as a function of C t and ϕ. Taking into account general expression (1) and the theoretical predictions [32,34,66] as well as experimental results [17,35], the parametrization of q 1S was chosen in the form…”

Section: The Effective Mcf Parametersmentioning

confidence: 99%

Experimental investigation of muon-catalyzed dt fusion in wide ranges of D/T mixture conditions

Bom

Demin

Демин

et al. 2005

J. Exp. Theor. Phys.

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¡Ñ¥¤¨´¥´´µ£µ ˆ´¸É¨ÉÊÉ Ÿ¤¥•´ÒÌ ˆ¸¸²¥¤µ¢ ´¨°. "Ê¡´ , 2004 Bom V. R. et al. E15-2004-132 Experimental Investigation of Muon-Catalyzed dt Fusion in Wide Ranges of D/T Mixture Conditions A vast program of the experimental investigation of muon-catalyzed dt fusion was performed at the JINR Phasotron. Parameters of the dt cycle were obtained in a wide range of D/T mixture conditions: temperatures of 20 ÷ 800 K, densities of 0.2 ÷ 1.2 LHD and tritium concentrations of 15 ÷ 86%. The results obtained are summarized.The investigation has been performed at the Dzhelepov Laboratory of Nuclear Problems, JINR.

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Calculations of the cascade characteristics for hadronic hydrogen atoms based on a quantum-classical approach

Faǐfman¹,

Men’shikov²

2009

Exa/Leap 2008

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Cited by 9 publications

References 3 publications

Isotopic effects in scattering and kinetics of the atomic cascade of excited μ−p and μ−d atoms

Isotopic effects in scattering and kinetics of the atomic cascade of excited μ−p and μ−d atoms

Experimental investigation of muon-catalyzed dt fusion in wide ranges of D/T mixture conditions

Calculations of the cascade characteristics for hadronic hydrogen atoms based on a quantum-classical approach

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