Dynamic effects in fragmentation reactions.

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Fragmentation reactions offer a useful tool to study the spectroscopy of halo nuclei, but the large extent of the halo wave function makes the reaction theory more difficult. The simple reaction models based on the eikonal approximation for the nuclear interaction or first-order perturbation theory for the Coulomb interaction have systematic errors that they investigate here, comparing to the predictions of complete dynamical calculations. They find that stripping probabilities are underpredicted by the eikonal model, leading to extracted spectroscopy strengths that are two large. In contrast, the Coulomb excitation is overpredicted by the simple theory. They attribute this to a ... continued below

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Bertsch, G. F. & Esbensen, H. March 26, 2002.

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Fragmentation reactions offer a useful tool to study the spectroscopy of halo nuclei, but the large extent of the halo wave function makes the reaction theory more difficult. The simple reaction models based on the eikonal approximation for the nuclear interaction or first-order perturbation theory for the Coulomb interaction have systematic errors that they investigate here, comparing to the predictions of complete dynamical calculations. They find that stripping probabilities are underpredicted by the eikonal model, leading to extracted spectroscopy strengths that are two large. In contrast, the Coulomb excitation is overpredicted by the simple theory. They attribute this to a screening effect, as is well known in the Barkas effect on stopping powers. The errors decrease with beam energy as E{sub beam}{sup -1}, and are not significant at beam energies above 50 MeV/u. At lower beam energies, the effects should be taken into account when extracting quantitative spectroscopic strengths.

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  • Yukawa International Seminar 2001 (YKIS01) : Physics of Unstable Nuclei, Kyoto (JP), 11/05/2001--11/10/2001

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  • Report No.: ANL/PHY/CP-107208
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 797880
  • Archival Resource Key: ark:/67531/metadc736860

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 26, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 21, 2016, 12:43 p.m.

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Bertsch, G. F. & Esbensen, H. Dynamic effects in fragmentation reactions., article, March 26, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc736860/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.