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Related topics

 


FRIB Estimated Rates

The projected intensities of beams at FRIB are online at Link


Some tools for COSY and LISE++ from Mauricio Portillo

*  COSY to MOCADI map conversion and command builder
*  COSY to LISE++ map conversion
*  COSY generator of LISE++ extended type blocks
*  Convert LISE++ Monte Carlo output to ROOT ntuple

Link


Transport Integral: A method to calculate the time evolution
of phase-space distributions


D.Bazin and B.M.Sherrill, Physical Review E, vol.50 (5), 1994, pp.4017-4021.

An analytical technique using integral equations for the transport of ion-optical intensity distributions through magnetic systems is described. It can serve as an alternative to Monte Carlo simulation to calculate the time evolution of phase-space distributions of any given shape. Under the assumption of linear optics, the solution of the integral equations can be reduced to convolution  products. One major application of this approach is the fast calculation of the transmission and purification of radioactive nuclear beams produced by projectile fragmentation.

doc/transport_integral.pdf


Application to fusion-evaporation: LisFus & PACE4

O.B.Tarasov, D.Bazin, NIM B204 (2003) 174-178

A new fusion-evaporation model LisFus for fast calculation of fusion residue cross sections has been developed in the framework of the code LISE. This model can calculate very small cross-sections quickly due to its compared to programs using the Monte Carlo method. Such type of fast calculations is necessary to estimate fusion residue yields. Using this model the program LISE has now the possibility to calculate the transmission of fusion residues through a fragment separator.

It is also possible to use fusion residues cross sections calculated by the program PACE which has been incorporated in the LISE package. The code PACE is a modified version of JULIAN - the Hillman-Eyal evaporation code using a Monte-Carlo code coupling angular momentum. A comparison between PACE and the LisFus model is presented.

NIM B204 (2003) 174-178
5_15/lise_5_15.html


Universal parameterization of momentum distribution of
projectile fragmentation products


Fragment momentum distributions measured in relativistic heavy ion  collisions are typically observed to be gaussian shaped. Within the framework of the well-known statistical model , a parabolic dependence 
of the width of the gaussian momentum distributions is obtained, and the fragment velocity is equal the projectile velocity. However, this model is unable to account for the following: 

*  The differences in widths associated with nuclides of the same mass; 
*  The apparently anomalously small values of s0 observed at lower energies; 
*  The occurrence an exponential tail in momentum distributions in reactions at low energies; 
*  The reduction of the velocity relation of a fragment to projectile at low energies. 

Different models were developed further for an explanation of these phenomena both theoretical, and empirical parameterizations. Each of  models has advantages and drawbacks depending on energy, mass of projectile and other parameters. The universal parameterization, which avoids the indicated drawbacks inherent in the statistical  model  is developed and adapted in the LISE program.  

This model of momentum distribution is universal: it includes a  definition of the distribution width depending on beam energy and on prefragment excitation energy, an estimation of the most probable fragment velocity, and a low-energetic exponential tail. An attempt to describe experimental distributions of fragmentation products was undertaken using a convolution between gaussian and exponential lineshapes. 

NNC 2003, Moscow.
PowerPoint (3.8 MB)

Nuclear Physics A734 (2004) 536-540


Statistical model calculations in heavy ion reactions (PACE)

A.Gavron, Phys.Rev. C21 (1980) 230-236

Results of various fusion experiments with heavy ions are compared with predictions model calcualtions (PACE). In some reactions there is evidence for nonstatistical effects based on significant discrepancies between the calculations and the experimental results. Alternative explanations of these discrepancies are considered.

doc/pace2.pdf


Calculated Nuclide Production Yields in Relativistic Collisions of Fissile Nuclei

J.Benlliure, A.Grewe, M.de Jong, K.-H.Schmidt, S.Zhdanov
Nucl.Phys. A628, 458 (1998)

A model calculation is presented which predicts the complex nuclide distribution resulting from peripheral relativistic heavy-ion collisions involving fissile nuclei. The model is based on a modern version of the abrasion-ablation model which describes the formation of excited prefragments due to the nuclear collisions and their consecutive decay. The competition between the evaporation of different light particles and fission is computed with an evaporation code which takes dissipative effects and the emission of intermediate-mass fragments into account. The nuclide distribution resulting from fission processes is treated by a semi-empirical description which includes the excitation-energy dependent influence of nuclear shell effects and pairing correlatios. The calculations of collisions between 238U and different reaction partners reveal that a huge number of isotopes of all elements up to uranium is produced. The complex nuclide distribution shows the characteristics of fragmentation, mass-asymmetric low-energy fission and mass-symmetric high-energy fission. The yields of the different components for different reaction partners are studied. Consequences for technical applications are discussed.

doc/NPA98_fission.pdf


A Reexamination of the Abrasion-Ablation Model for
 the Description of the Nuclear Fragmentation Reaction


J.-J.Gaimard, K.-H.Schmidt, Nucl.Phys. A531, 709 (1991)

The nuclear fragmentation reaction is studied as an important production mechanism for secondary beams. The geometrical abrasion model and a macroscopic evaporation model which describe the two steps of the reaction are reexamined. Several improvements and modifications of these models are discussed and a new model description incorporating these elements is proposed. In particular, the excitation energy and the angular-momentum distribution of the prefragments, the formulation of evaporation as a diffusion process and the role of microscopic structure in the production cross section are considered. The new model description preserves the simplicity and the transparency of the original models. The prediction of the new model are compared to those of the original models and to experimental cross sections. While the original models showed several systematic discrepancies in comparison to measured cross sections, the new model is able to reproduce the whole body of experimental data with satisfactory agreement.


Modified Empirical Parametrization of Fragmentation Cross Section

K.Summerer, B.Blank, Phys.Rev. C61, 034607 (2000)

New experimental data obtained mainly at the GSI/FRS facility allow one to modify the empirical parametrization of fragmentation cross sections. It will be shown that minor modifications of the parameters lead to a much better reproduction of measured cross sections. The most significant changes refer to the description of fragmentation yields close to the projectile and of the memory effect of neutron-deficient projectiles.

doc/epax.pdf


ATIMA

ATIMA is a user program developed at GSI which calculates various physical quantities characterizing the slowing-down of protons and heavy ions in matter for specific kinetic energies ranging from 1 keV/u to 500 GeV/u such as

  • stopping power
  • energy loss
  • energy-loss straggling
  • angular straggling
  • range
  • range straggling
  • beam parameters (magnetic rigidity, time-of-flight, velocity, etc.)
  • atomic charge-changing cross sections
  • charge-state evolutions
  • equilibrium charge-state distributions

http://www-linux.gsi.de/~weick/atima/


Charge states of relativistic heavy ions in matter

C.Scheidenberger, Th.Stohlker, W.E.Meyerhof, H.Geissel,
P.H. Mokler, B. Blank,  NIM B142 (1998) 441-462.

Experimental and theoretical results on charge-exchange cross-sections and charge-state distributions of relativistic heavy ions penetrating through matter are presented. The data were taken at the Lawrence Berkeley Laboratory's BEVALAC accelerator and at the heavy-ion synchrotron SIS of GSI in Darmstadt in the energy range 801000 MeV/u. Beams from Xe to U impinging on solid and gaseous targets between Be and U were used. Theoretical models for the charge-state evolution inside matter for a given initial charge state are presented. For this purpose, computer codes have been developed, which are briefly described. Examples are given which show the successes and limitations of the models.

doc/charge-global.pdf
http://www-linux.gsi.de/~weick/charge_states/


Charged particle transport code

1.  K.L. Brown, D.C. Carey, Ch. Iselin and F. Rothacker:
 Transport, a Computer Program for Designing Charged Particle Beam Transport Systems. CERN 73-16 (1973) & CERN 80-04 (1980).

2.  Urs Rohrer, Compendium of Transport Enhancements

http://pc532.psi.ch/trans.htm


Particle interaction with matter
The Stopping and Range of Ions in Matter (SRIM)

J.F.Ziegler

SRIM is a group of programs which calculate the stopping and range of ions (up to 2 GeV/amu) into matter using a quantum mechanical treatment of ion-atom collisions (assuming a moving atom as an "ion", and all target atoms as "atoms"). This calculation is made very efficient by the use of statistical algorithms which allow the ion to make jumps between calculated collisions and then averaging the collision results over the intervening gap. During the collisions, the ion and atom have a screened Coulomb collision, including exchange and correlation interactions between the overlapping electron shells. The ion has long range interactions creating electron excitations and plasmons within the target. These are described by including a description of the target's collective electronic structure and interatomic bond structure when the calculation is setup (tables of nominal values are supplied). The charge state of the ion within the target is described using the concept of effective charge, which includes a velocity dependent charge state and long range screening due to the collective electron sea of the target.

http://www.srim.org