Hot nuclei -- Landau theory, thermal fluctuations and dissipation

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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 ... continued below

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42 p.

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Alhassid, Y. December 31, 1990.

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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.

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OSTI; NTIS; INIS; GPO Dep.

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

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  • 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

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1990

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  • Nov. 3, 2018, 11:47 a.m.

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Alhassid, Y. Hot nuclei -- Landau theory, thermal fluctuations and dissipation, article, December 31, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc1319986/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.