Hot nuclei -- Landau theory, thermal fluctuations and dissipation Metadata

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Title

  • Main Title Hot nuclei -- Landau theory, thermal fluctuations and dissipation

Creator

  • Author: Alhassid, Y.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Yale University
    Place of Publication: New Haven, Connecticut
    Additional Info: Yale Univ., New Haven, CT (United States)

Date

  • Creation: 1990-12-31

Language

  • English

Description

  • Content Description: The basic ideas and theoretical methods used in the description of hot nuclei are reviewed. In particular, a macroscopic approach to shape transitions is discussed in the framework of the Landau theory in which the quadrupole shape degrees of freedom play the role of the order parameters. This theory describes the universal features of the nuclear shape evolution with temperature and spin. A unified description of fluctuations in all five quadrupole degrees of freedom is introduced and plays an important role in the calculation of physical observables. A macroscopic approach to the giant dipole resonance (GDR) in hot nuclei is developed. With all parameters fixed by the zero temperature nuclear properties, the theory predicts both the GDR cross-section and angular anisotropy of the {gamma}-rays in very good agreement with recent experiments. The intrinsic shape fluctuations are the main cause for the resonance broadening at higher temperatures, while the orientation fluctuations are responsible for the observed attenuation in the angular anisotropy. Dissipation at finite temperature is discussed in the framework of a Langevin-like equation describing the time-dependent shape fluctuations. Non-adiabatic effects may cause motional narrowing of the resonance.
  • Physical Description: 42 p.

Subject

  • Keyword: Langevin Equation
  • Keyword: Fokker-Planck Equation
  • Keyword: Deformed Nuclei
  • Keyword: Giant Resonance
  • Keyword: Nuclear Temperature
  • Keyword: Cross Sections
  • Keyword: Critical Temperature 663110
  • Keyword: Phase Transformations
  • Keyword: General And Average Properties Of Nuclei And Nuclear Energy Levels
  • Keyword: Fluctuations
  • Keyword: Mean-Field Theory
  • STI Subject Categories: 73 Nuclear Physics And Radiation Physics
  • Keyword: Heavy Ion Fusion Reactions
  • Keyword: Nuclear Structure

Source

  • Conference: 5. Nishinomiya Yukawa-memorial symposium,Nichinomiya City (Japan),25-26 Oct 1990

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Other: DE92015008
  • Report No.: CONF-9010306--2
  • Report No.: YCTP-N--25-90
  • Grant Number: FG02-91ER40608
  • Office of Scientific & Technical Information Report Number: 10149137
  • Archival Resource Key: ark:/67531/metadc1319986

Note

  • Display Note: OSTI; NTIS; INIS; GPO Dep.
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