HOW TO CALIBRATE THE TIME SCALE OF EMISSION OF INTERMEDIATE MASS FRAGMENTS

2005 ◽  
Vol 14 (03) ◽  
pp. 353-357 ◽  
Author(s):  
J. WILCZYŃSKI ◽  
E. DE FILIPPO ◽  
A. PAGANO ◽  
F. AMORINI ◽  
A. ANZALONE ◽  
...  
Keyword(s):  
Experimental Data ◽  
Time Scale ◽  
Time Sequence ◽  
Intermediate Mass ◽  
Intermediate Energies

In order to obtain information on the time sequence and time scale of the production of intermediate mass fragments (IMF) in nucleus-nucleus collisions at intermediate energies it is proposed to analyze correlations between relative velocities of IMF's with respect to projectile-like fragments (PLF) and target-like fragments (TLF). Experimental data on the production of IMF's in the 124 Sn +64 Ni reaction, taken with the CHIMERA multidetector array at 35 MeV/nucleon, have been analyzed with the proposed method.

Time sequence and time scale of intermediate mass fragment emission

2005 ◽  
Vol 71 (4) ◽  
Author(s):  
E. De Filippo ◽  
A. Pagano ◽  
J. Wilczyński ◽  
F. Amorini ◽  
A. Anzalone ◽  
...  
Keyword(s):  
Time Scale ◽  
Time Sequence ◽  
Intermediate Mass ◽  
Mass Fragment ◽  
Intermediate Mass Fragment

The study of the refractive scattering of 6Li and 6He on carbon target with the S-matrix approach

2021 ◽  
Vol 36 (36) ◽  
Author(s):  
Liyuan Hu ◽  
Yushou Song ◽  
Yingwei Hou ◽  
Huilan Liu ◽  
Gongming Yu
Keyword(s):  
Experimental Data ◽  
Elastic Scattering ◽  
Forward Direction ◽  
Matrix Approach ◽  
Carbon Target ◽  
Intermediate Energies ◽  
S Matrix ◽  
Bombarding Energy

In this paper, the S-matrix parametrization is adopted to analyze the refractive scattering of [Formula: see text] at intermediate energies systematically and that of [Formula: see text] at 230 MeV. For [Formula: see text], the experimental data containing the Fraunhofer oscillations and the rainbow falloff are reproduced very well by adjusting parameters. The S-matrix parameters and the rainbow angles show evident tendencies as the bombarding energy increases, which are comparable with those of [Formula: see text] elastic scattering on carbon target. For [Formula: see text], the experimental data in the forward direction are reproduced successfully by slightly adjusting the parameters used in the calculation of [Formula: see text] at 210 MeV. The calculated results show that the [Formula: see text] scattering exhibits a comparable transparency with that of [Formula: see text] at intermediate energies.

NEUTRON ENRICHMENT OF THE NECK-ORIGINATED INTERMEDIATE MASS FRAGMENTS IN PREDICTIONS OF THE QMD MODEL

2012 ◽  
Vol 21 (05) ◽  
pp. 1250033 ◽  
Author(s):  
I. SKWIRA-CHALOT ◽  
T. CAP ◽  
K. SIWEK-WILCZYŃSKA ◽  
J. WILCZYŃSKI
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Density Dependence ◽  
Symmetry Energy ◽  
Isotopic Ratios ◽  
Energy Term ◽  
Intermediate Mass ◽  
Asymmetry Energy ◽  
The Asymmetry ◽  
Comparison With Experimental Data

The effect of neutron enrichment of the neck formed during reseparation of two colliding nuclei was studied with the aim to infer an information on the density dependence of the asymmetry energy term in the equation of state. By using a version of the QMD model of Łukasik it is shown that the neutrons-to-protons ratio of the intermediate mass fragments (IMF) emitted from the neck, 〈N/Z〉, is not a sufficiently sensitive observable to discriminate between different assumptions regarding the symmetry term of the equation of state. As an alternative, isotopic ratios of selected pairs of isotopes turned out to be useful observables more sensitive to the assumed form of the symmetry term of the equation of state. A comparison with experimental data on isotopic ratios for beryllium and boron IMFs from the 124 Sn + 64 Ni reaction at 35 MeV/nucleon tentatively suggests that the ASY-SOFT option of the symmetry energy term in EOS is preferred.

scholarly journals THE ISOSPIN DISTRIBUTION OF FRAGMENTS IN REACTIONS 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru, and 96Zr + 96Zr AT BEAM ENERGY 400 AMeV

2002 ◽  
Vol 17 (07) ◽  
pp. 375-385 ◽  
Author(s):  
QINGFENG LI ◽  
ZHUXIA LI
Keyword(s):  
Time Evolution ◽  
Beam Energy ◽  
Charged Particles ◽  
Coulomb Force ◽  
Nuclear Potential ◽  
Intermediate Mass ◽  
Intermediate Energies ◽  
Dependent Part ◽  
Dynamical Balance ◽  
Light Charged Particles

The isospin distribution of particles and fragments in collisions 96Ru + 96Ru, 96Ru + 96Zr, 96Zr + 96Ru and 96Zr + 96Zr at beam energy 400 AMeV is studied with isospin-dependent QMD model. We find that the rapidity distribution of differential neutron–proton counting in neutron rich nucleus–nucleus collisions at intermediate energies is sensitive to the isospin-dependent part of nuclear potential. The study of the N/Z ratio of nucleons, light charged particles (LCP) and intermediate mass fragments (IMF) shows that the isospin-dependent part of nuclear potential drives IMF to be more isospin symmetric and emitted nucleons to be more neutron rich. From the study of the time evolution of the isospin distribution in emitted nucleons, LCP and IMF we find that neutrons diffuse much faster than protons at the beginning and the final isospin distribution is a result of dynamical balance of symmetry potential and Coulomb force under the charge conservation.

scholarly journals THE ISOSPIN DIFFUSION IN 58Ni-INDUCED REACTIONS AT INTERMEDIATE ENERGIES

2010 ◽  
Vol 19 (08n09) ◽  
pp. 1534-1544 ◽  
Author(s):  
◽  
E. GALICHET ◽  
M. F. RIVET ◽  
B. BORDERIE ◽  
M. COLONNA ◽  
...  
Keyword(s):  
Experimental Data ◽  
Symmetry Energy ◽  
Incident Energy ◽  
Transport Model ◽  
Dissipated Energy ◽  
Equilibration Time ◽  
Nuclear Density ◽  
Energy Term ◽  
Intermediate Energies ◽  
Potential Part

Isospin diffusion is probed as a function of the dissipated energy by studying two systems 58 Ni +58 Ni and 58 Ni +197 Au , over the incident energy range 52-74A MeV. Experimental data are compared with the results of a microscopic transport model with two different parameterizations of the symmetry energy term. A better overall agreement between data and simulations is obtained when using a symmetry term with a potential part linearly increasing with nuclear density. The isospin equilibration time at 52 A MeV is estimated to 130 ± 10 fm/c.

scholarly journals AN INFRARED ORIGIN OF LEPTONIC MIXING AND ITS TEST AT DEEPCORE

2011 ◽  
Vol 26 (27n28) ◽  
pp. 4739-4753 ◽  
Author(s):  
F. TERRANOVA
Keyword(s):  
Experimental Data ◽  
Time Scale ◽  
Energy Scale ◽  
Low Energy ◽  
Short Time Scale ◽  
Mixing Angles ◽  
Ice Cube ◽  
Energy Behavior ◽  
Current Experimental Data ◽  
Short Time

Fermion mixing is generally believed to be a low-energy manifestation of an underlying theory whose energy scale is much larger than the electroweak scale. In this paper we investigate the possibility that the parameters describing lepton mixing actually arise from the low-energy behavior of the neutrino interacting fields. In particular, we conjecture that the measured value of the mixing angles for a given process depends on the number of unobservable flavor states at the energy of the process. We provide a covariant implementation of such conjecture, draw its consequences in a two-neutrino family approximation and compare these findings with current experimental data. Finally we show that this infrared origin of mixing will be manifest at the Ice Cube DeepCore array, which measures atmospheric oscillations at energies much larger than the tau lepton mass; it will hence be experimentally tested in a short time scale.

A Mixed-Time-Scale SGS Model With Fixed Model-Parameters for Practical LES

2005 ◽  
Vol 127 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Masahide Inagaki ◽  
Tsuguo Kondoh ◽  
Yasutaka Nagano
Keyword(s):  
Experimental Data ◽  
Time Scale ◽  
Bluff Body ◽  
Present Model ◽  
Plane Channel ◽  
Wall Turbulence ◽  
Model Parameters ◽  
Complex Flow ◽  
Smagorinsky Model ◽  
Fixed Model

A new subgrid-scale (SGS) model for practical large eddy simulation (LES) is proposed. The model is constructed with the concept of mixed time-scale, which makes it possible to use fixed model-parameters and to dispense with the distance from the wall. The model performance is tested in plane channel flows, and the results show that this model is able to account for near-wall turbulence without an explicit damping function as in the dynamic Smagorinsky model. The model is also evaluated in a backward-facing step flow and in a flow around a circular cylinder. The calculated results using the consistent model-parameters show good agreement with experimental data, while the results obtained using the dynamic Smagorinsky model show less accuracy and less computational stability. Furthermore, to confirm the validity of the present model in practical applications, the three-dimensional complex flow around a bluff body (Ahmed et al., SAE paper no. 840300) is also calculated with the model. The agreement between the calculated results and the experimental data is quite satisfactory. These results suggest that the present model is a refined SGS model suited for practical LES to compute flows in a complicated geometry.

scholarly journals Dosimetric Optimization of a Laser-Driven Irradiation Facility Using the G4-ELIMED Application

2021 ◽  
Vol 11 (21) ◽  
pp. 9823
Author(s):  
Sergio Mingo Barba ◽  
Francesco Schillaci ◽  
Roberto Catalano ◽  
Giada Petringa ◽  
Daniele Margarone ◽  
...  
Keyword(s):  
Experimental Data ◽  
Laser Plasma ◽  
Irradiation Time ◽  
Transmission Efficiency ◽  
Ion Beams ◽  
Proton Beams ◽  
Short Irradiation Time ◽  
Intermediate Energies ◽  
Proton Source ◽  
Sample Irradiation

ELIMED has been developed and installed at ELI beamlines as a part of the ELIMAIA beamline to transport, monitor, and use laser-driven ion beams suitable for multidisciplinary applications, including biomedical ones. This paper aims to investigate the feasibility to perform radiobiological experiments using laser-accelerated proton beams with intermediate energies (up to 30 MeV). To reach this goal, we simulate a proton source based on experimental data like the ones expected to be available in the first phase of ELIMED commissioning by using the G4-ELIMED application (an application based on the Geant4 toolkit that simulates the full ELIMED beamline). This allows the study of transmission efficiency and the final characteristics of the proton beam at the sample irradiation point. The Energy Selector System is used as an active energy modulator to obtain the desired beam features in a relatively short irradiation time (around 6 min). Furthermore, we demonstrate the capability of the beamline to filter out other ion contaminants, typically co-accelerated in a laser-plasma environment. These results can be considered as a detailed feasibility study for the use of ELIMED for various user applications such as radiobiological experiments with ultrahigh dose rate proton beams.

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