Development of tools and techniques for momentum compression of fast rare isotopes

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As part of our past research and development work, we have created and developed the LISE++ simulation code [Tar04, Tar08]. The LISE++ package was significantly extended with the addition of a Monte Carlo option that includes an option for calculating ion trajectories using a Taylor-series expansion up to fifth order, and implementation of the MOTER Monte Carlo code [Kow87] for ray tracing of the ions into the suite of LISE++ codes. The MOTER code was rewritten from FORTRAN into C++ and transported to the MS-Windows operating system. Extensive work went into the creation of a user-friendly interface for the code. ... continued below

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Morrissey, David J.; Sherrill, Bradley M. & Tarasov, Oleg November 21, 2010.

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As part of our past research and development work, we have created and developed the LISE++ simulation code [Tar04, Tar08]. The LISE++ package was significantly extended with the addition of a Monte Carlo option that includes an option for calculating ion trajectories using a Taylor-series expansion up to fifth order, and implementation of the MOTER Monte Carlo code [Kow87] for ray tracing of the ions into the suite of LISE++ codes. The MOTER code was rewritten from FORTRAN into C++ and transported to the MS-Windows operating system. Extensive work went into the creation of a user-friendly interface for the code. An example of the graphical user interface created for the MOTER code is shown in the left panel of Figure 1 and the results of a typical calculation for the trajectories of particles that pass through the A1900 fragment separator are shown in the right panel. The MOTER code is presently included as part of the LISE++ package for downloading without restriction by the worldwide community. The LISE++ was extensively developed and generalized to apply to any projectile fragment separator during the early phase of this grant. In addition to the inclusion of the MOTER code, other important additions to the LISE++ code made during FY08/FY09 are listed. The LISE++ is distributed over the web (http://groups.nscl.msu.edu/lise ) and is available without charge to anyone by anonymous download, thus, the number of individual users is not recorded. The number of 'hits' on the servers that provide the LISE++ code is shown in Figure 3 for the last eight calendar years (left panel) along with the country from the IP address (right panel). The data show an increase in web-activity with the release of the new version of the program during the grant period and a worldwide impact. An important part of the proposed work carried out during FY07, FY08 and FY09 by a graduate student in the MSU Physics program was to benchmark the codes by comparison of detailed measurements to the LISE++ predictions. A large data set was obtained for fission fragments from the reaction of 238U ions at 81 MeV/u in a 92 mg/cm2 beryllium target with the A1900 projectile fragment separator. The data were analyzed and form the bulk of a Ph.D. dissertation that is nearing completion. The rich data set provides a number of benchmarks for the improved LISE++ code and only a few examples can be shown here. The primary information obtained from the measurements is the yield of the products as a function of mass, charge and momentum. Examples of the momentum distributions of individually identified fragments can be seen in Figures 2 and 4 along with comparisons to the predicted distributions. The agreement is remarkably good and indicates the general validity of the model of the nuclear reactions producing these fragments and of the higher order transmission calculations in the LISE++ code. The momentum distributions were integrated to provide the cross sections for the individual isotopes. As shown in Figure 5, there is good agreement with the model predictions although the observed cross sections are a factor of five or so higher in this case. Other comparisons of measured production cross sections from abrasion-fission reactions have been published by our group working at the NSCL during this period [Fol09] and through our collaboration with Japanese researchers working at RIKEN with the BigRIPS separator [Ohn08, Ohn10]. The agreement of the model predictions with the data obtained with two different fragment separators is very good and indicates the usefulness of the new LISE++ code.

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  • Report No.: Final Report
  • Grant Number: FG02-03ER41265
  • DOI: 10.2172/1004060 | External Link
  • Office of Scientific & Technical Information Report Number: 1004060
  • Archival Resource Key: ark:/67531/metadc840123

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  • November 21, 2010

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:51 p.m.

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Morrissey, David J.; Sherrill, Bradley M. & Tarasov, Oleg. Development of tools and techniques for momentum compression of fast rare isotopes, report, November 21, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc840123/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.