Observation of a Peak Structure in Positron Spectra from U+Cm Collisions

Schweppe, John E.; Gruppe, A.; Bethge, Κ.; Bokemeyer, H.; Cowan, T. E.; Folger, H.; Greenberg, Jay; Grein, H.; Ito, S.; Schüle, Roland; Schwalm, D.; Stiebing, K. E.; Trautmann, Ν.; Vincent, P.; Waldschmidt, M.

doi:10.1103/physrevlett.51.2261

Cited by 339 publications

(116 citation statements)

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“…Such systems are of general interest theoretically [22,23]. During the passage of particles through matter most of these exotic hadronic systems are formed, albeit, their low mean lives [20,24,25]. One can consider the background to mimic a plasma.…”

Section: Introductionmentioning

confidence: 99%

The influence of Debye plasma on the ground state energies of exotic systems

Sil

Pawlak²,

Mukherjee

et al. 2008

Journal of Quantitative Spectroscopy and Radiative Transfer

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The effect of plasma environment on the ground state energies of exotic systems ppµ, ddµ and ttµ has been analyzed within a generalized three-body formalism using multi-term correlated basis sets. The Debye screening model of the plasma has been adopted for such a study. The binding energies of p with pµ, d with dµ and t with tµ have been estimated for a range of values of the Debye screening parameters. The systems tend towards instability for increased screening. The effect of particle correlation has been investigated in detail and is found to play important role for the stability in these systems.

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Section: Introductionmentioning

confidence: 99%

The influence of Debye plasma on the ground state energies of exotic systems

Sil

Pawlak²,

Mukherjee

et al. 2008

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…However, since the atom with Z 137 can be created for only a short time in heavy ion collision experiment, it is difficult to observe the phenomena experimentally at the quantitive level [3,4].…”

Section: Jhep02(2016)092mentioning

confidence: 99%

Bosonization approach for “atomic collapse” in graphene

Kagimura

Onogi

2016

J. High Energ. Phys.

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Abstract:We study quantum electrodynamics with 2+1 dimensional massless Dirac fermion around a Coulomb impurity. Around a large charge with atomic number Z > 137, the QED vacuum is expected to collapse due to the strong Coulombic force. While the relativistic quantum mechanics fails to make reliable predictions for the fate of the vacuum, the heavy ion collision experiment also does not give clear understanding of this system. Recently, the "atomic collapse" resonances were observed on graphene where an artificial nuclei can be made. In this paper, we present our nonperturbative study of the vacuum structure of the quasiparticles in graphene with a charge impurity which contains multi-body effect using bosonization method.

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“…Under this assumption, which will be justified by the consistency of the final results, the positron differential cross section resulting from the decay of such a particle can be written as do dN dE " C cl dE (2) where E is the total positron energy and dN/dE is the energy distribution of the emitted positrons. The characteristic heavy-ion cross section for positron production, a c i, sets the scale for the yield in Eq.…”

Section: Decay Mechanismmentioning

confidence: 99%

“…The spectra of positrons emitted from the center of mass of the heavy-ion system have been experimentally studied; in particular, some sharp lines were identified. 2 Numerical methods have been developed to solve the timedependent Dirac equation in the presence of strong electromagnetic fields, 1 ' 3 and it has been shown that if a small fraction of the collisions leads to a nuclear reaction with a very long time delay, then one would expect to see such peaks. A possible mechanism to obtain such a delay time has been advanced by Greiner and co-workers.…”

Section: Introductionmentioning

confidence: 99%