FRAGMENTATION OF RADIOACTIVE BEAMS FOR TAILORING FISSION TRANSIENTS

2009 ◽  
Vol 18 (10) ◽  
pp. 2150-2154 ◽  
Author(s):  
C. Schmitt ◽  
A. KELIĆ ◽  
K.-H. SCHMIDT ◽  
A. HEINZ ◽  
B. JURADO ◽  
...  
Keyword(s):  
Experimental Approach ◽  
Initial Conditions ◽  
Nuclear Charge ◽  
Nuclear Fission ◽  
Heavy Ion ◽  
Transient Effects ◽  
Radioactive Beams ◽  
Nuclear Charge Distribution ◽  
Dissipative Effects ◽  
First Time

A novel experimental approach for studying dissipative effects in nuclear fission has been developed at GSI, Darmstadt. Fragmentation of radioactive heavy-ion beams is employed to prepare fissile nuclei in well-defined initial conditions and the fission-fragment nuclear charge distribution is used for investigating pre-saddle dynamics in detail. The undeniable manifestation of transient effects at high temperature is demonstrated and the influence of the initial deformation is clearly evidenced for the first time.

MODELLING OF DISSIPATION IN NUCLEAR FISSION

2004 ◽  
Vol 13 (01) ◽  
pp. 97-101
Author(s):  
C. SCHMITT ◽  
B. JURADO ◽  
A. R. JUNGHANS ◽  
K.-H. SCHMIDT ◽  
J. BENLLIURE
Keyword(s):  
Experimental Approach ◽  
Nuclear Fission ◽  
Heavy Ion ◽  
Analytical Approximation ◽  
Time Dependent ◽  
Relativistic Energy ◽  
Transient Effects ◽  
Ion Collisions ◽  
Relaxation Effects ◽  
Nuclear Dissipation

Peripheral heavy-ion collisions at relativistic energy are proposed as a new experimental approach dedicated to nuclear dissipation studies and, in particular, to investigate transient effects which are responsible for the inhibition of fission at the beginning of the process. To extract reliable information from the data, an analytical approximation of the time-dependent fission decay width is used in connection with new experimental signatures of relaxation effects.

Isotope shifts and hyperfine structure in the atomic spectrum of palladium

1976 ◽  
Vol 351 (1665) ◽  
pp. 267-275 ◽  
Keyword(s):  
High Resolution ◽  
Hyperfine Structure ◽  
Nuclear Charge ◽  
Digital Recording ◽  
Mean Square ◽  
Atomic Spectrum ◽  
Nuclear Charge Distribution ◽  
Change In The Mean ◽  
The Mean ◽  
First Time

The lines λ340.5 nm, λ357.1 nm, and λ677.4 nm of the arc spectrum of palladium have been studied under high resolution by means of digital recording interferometry. The even-even shifts are claimed to be more accurate than previously published work; the relative shifts determined in λ357.1 nm are 102 Pd - 104 Pd, 1.03(2); 104 Pd - 106 Pd, 1.00; 106 Pd - 108 Pd, 1.02(1); 108 Pd - 110 Pd, 0.92(2); 104 Pd - 105 Pd, 0.23(1). An odd-even shift has been measured for the first time in this element, and shows appreciable staggering. The relative shift 102 Pd - 104 Pd has been found to be substantially greater than the values reported in the literature. Values of the change in the mean square radius of the nuclear charge distribution have been deduced from the measurements, all to an accuracy of Ŧ15% ; these are: 102 Pd - 104 Pd, 0.176 fm 2 ; 104 Pd - 106 Pd, 0.170 fm 2 ; 106 Pd - 108 Pd, 0.173 fm 2 ; 108 Pd - 110 Pd, 0.153 fm 2 .

Isotope shift and hyperfine structure in the atomic spectrum of tin

1973 ◽  
Vol 332 (1588) ◽  
pp. 129-138 ◽  
Keyword(s):  
Stable Isotopes ◽  
Hyperfine Structure ◽  
Nuclear Charge ◽  
Light Sources ◽  
Atomic Spectrum ◽  
Nuclear Charge Distribution ◽  
Fabry Perot ◽  
Self Consistent ◽  
Structure Constants ◽  
Good Agreement

Three lines in the atomic spectrum of tin, λ 3262 Å, λ 3283 Å and λ 6454Å have been studied in emission under high resolution with the use of light sources containing enriched isotopic samples. Results are reported for isotope shifts in these lines for the abundant stable isotopes ( A ≽ 116). Pressure-scanned Fabry–Perot etalons provided the necessary resolution; the spectrograms for λ 6454 Å were recorded and analysed by digital techniques, and for this line hyperfine structure constants required in the interpretation of the data were also evaluated. The results for the three lines are not in good agreement with earlier work, but are shown to be self-consistent by means of a King plot. Their interpretation in terms of the nuclear charge distribution is considered in the following paper.

scholarly journals Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions

2006 ◽  
Vol 636 (6) ◽  
pp. 299-304 ◽  
Author(s):  
Tetsufumi Hirano ◽  
Ulrich Heinz ◽  
Dmitri Kharzeev ◽  
Roy Lacey ◽  
Yasushi Nara
Keyword(s):  
Heavy Ion Collisions ◽  
Elliptic Flow ◽  
Heavy Ion ◽  
Ion Collisions ◽  
Dissipative Effects ◽  
Ultrarelativistic Heavy Ion Collisions

Experimental and Numerical Investigation Into the Effects of Initial Conditions on a Three Degree of Freedom Capsize Model

2006 ◽  
Vol 50 (01) ◽  
pp. 63-84
Author(s):  
Young-Woo Lee ◽  
Leigh McCue ◽  
Michael Obar ◽  
Armin Troesch
Keyword(s):  
Numerical Model ◽  
Numerical Investigation ◽  
Initial Conditions ◽  
Degree Of Freedom ◽  
Transient Effects ◽  
Ultimate State ◽  
Extreme Behavior ◽  
Three Degree Of Freedom ◽  
Physical Phenomena ◽  
Ship Capsizing

The dynamics and hydrodynamics of ship capsizing include strong nonlinearities, transient effects, and physical phenomena that have not been fully identified or studied. This paper presents a study of some of the various mechanisms associated with this extreme behavior. A quasi-nonlinear three degree of freedom numerical model is employed to examine the effects of initial conditions on the ultimate state of a box barge model. The numerical results are then used to provide structure and understanding to otherwise seemingly inconsistent and ambiguous experiments.

Mu-Mesonic X-Rays and the Shape of the Nuclear Charge Distribution

1954 ◽  
Vol 94 (6) ◽  
pp. 1617-1629 ◽  
Author(s):  
David L. Hill ◽  
Kenneth W. Ford
Keyword(s):  
Charge Distribution ◽  
Nuclear Charge ◽  
X Rays ◽  
Nuclear Charge Distribution

scholarly journals Study of the influence of initial-state fluctuations on hydrodynamic simulations

2020 ◽  
Vol 245 ◽  
pp. 06005
Author(s):  
Marcin Słodkowski ◽  
Patryk Gawryszewski ◽  
Dominik Setniewski
Keyword(s):  
Initial Conditions ◽  
Graphics Processing Unit ◽  
Heavy Ion ◽  
Processing Unit ◽  
Initial State ◽  
Final State ◽  
Hydrodynamic Simulation ◽  
Hydrodynamic Simulations ◽  
Cartesian Coordinate ◽  
Ion Collision

In this work, we are focusing on assessing the contribution of the initial-state fluctuations of heavy ion collision in the hydrodynamic simulations. We are trying to answer the question of whether the hydrodynamic simulation retains the same level of fluctuation in the final-state as for the initial stage. In another scenario, the hydrodynamic simulations of the fluctuation drowns in the final distribution of expanding matter. For this purpose, we prepared sufficient relativistic hydrodynamic program to study A+A interaction which allows analysing initial-state fluctuations in the bulk nuclear matter. For such an assumption, it is better to use high spatial resolution. Therefore, we applied the (3+1) dimensional Cartesian coordinate system. We implemented our program using parallel computing on graphics cards processors - Graphics Processing Unit (GPU). Simulations were carried out with various levels of fluctuation in initial conditions using the average method of events coming from UrQMD models. Energy density distributions were analysed and the contribution of fluctuations in initial conditions was assessed in the hydrodynamic simulation.

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