The experimental results of the activation spectra, dose rate
measurements, and the residual nuclide production cross sections
obtained after the irradiation of the NatCu and
59Co targets by 12C ion ...beams at ITEP and
GSI are presented in this paper. These results are compared with
simulations by the CASCADE and LAQGSM codes.
Interaction of heavy ions with plasmas Jacoby, J.; Bickes, Ch; Flierl, H.-P. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
07/1996, Letnik:
115, Številka:
1
Journal Article
Recenzirano
Intense heavy ion beams have been used in recent years to study the properties of matter under extreme conditions. The intense heavy ion beams of the radio frequency accelerator MAXILAC at GSI were ...used at ion energies of 45 keV/u to produce the first heavy ion driven plasma and to study the hydrodynamic reactions of this plasma. Similar experiments at 300 MeV/u ion energy using the heavy ion synchrotron SIS have now proven to be successful. The understanding and modelling of ion beam driven plasmas requires a precise knowledge of the stopping power in a plasma. Thus, in parallel to the ion beam driven plasmas, the stopping power of a fully ionized hydrogen plasma has been investigated experimentally testing an ion energy range of 45 keV/u to 10 MeV/u at plasma densities from 10
16 to 10
19 cm
−3. The stoppping power experiments revealed the principle of new stopping behavior of ions in a plasma. In comparison to cold, non-ionized matter an increased stopping in hydrogen plasma up to a factor 35 has been observed.
Plasma targets for measuring energy loss and charge state distribution of heavy ions in non-ideal Ar-plasmas
(
Γ
-parameters 0.55–1.5) have been developed and the interaction with several ion ...species, C, Ar, Xe at
5.9
MeV
/
u
, was studied. Here the results for
5.9
MeV
/
u
C-ions are presented which have been understood just recently by considering the gas dynamics in the target due to the special configuration with the gap interaction zone for the plasma, which can be also simulated by the VarJet code.
The paper presents the results of precision measurements of the total stopping range and energy deposition function of
238U ions with specific energies
E
=
500 and 950
MeV/u in stainless steel and ...copper targets. The experiment was performed at the SIS-18 facility (GSI Darmstadt) in the experimental area Cave A in September 2004–May 2005.
The measured energy deposition profiles are compared with calculations using the codes ATIMA, PHITS, SHIELD and SRIM.
Using a full-potential linear-muffin-tin-orbital-method, changes of the valence electron density of CuCl due to TO(Γ)-phonon elongation are discussed. At the X-point, the complete phonon spectrum of ...CuCl, CuBr, and CuI has been determined and compared with the experiment.
Energy loss of heavy ions in a plasma target Hoffmann, DH; Weyrich, K; Wahl, H ...
Physical review. A, Atomic, molecular, and optical physics,
08/1990, Letnik:
42, Številka:
4
Journal Article
The public: definitions and perceptions The public is a difficult concept to grasp. It exhibits contradictory meanings: a collective abstract entity that is based on a “togetherness” founded on the ...exercise of reason; a cumulative heterogeneous phenomenon formed into an audience by certain kinds of specialised proceedings; or, another possibility, the driving force of action aimed at modifying something of the individuals that one wishes to reach. In all these cases, it is not a self-defined social collective. However, we constantly speak of the public's point of view. Can we really contemplate a situation in which the public could be thought of as a potential enunciator of a point of view? Or at least as an interlocutor in communication with the institutions of which it is the public? This article describes the division between the status of the members of the public engaged in interpersonal communications with representatives of the institution and the status of the public as a collective abstract entity engaged in a “communication” with the institution.
"Frozen" phonon calculations based on Density-Functional-Theory were performed for BaTiO
3
and SrTiO
3
with a full potential version of the linear-muffin-tin-orbital method. It was demonstrated that ...the ferroelectric instability in perovskites is the result of a delicate balance between forces produced by bonding and nonbonding states. Calculations of the electric field gradient at finite temperatures and its comparison to recent NMR-measurements in the tetragonal phase of BaTiO
3
allow conclusions about the displacement-displacement correlation function.
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