Zero- to first-sound transition for the Giant Dipole propagation in hot nuclei

✍ Scribed by V. Baran; M. Colonna; M. Di Toro; A.B. Larionov

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 381 KB
• Volume: 649
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(99)00058-5

✦ Synopsis

We discuss the transition to first sound propagation of the isovector dipole mode in heated nuclear matter. The presence of a damping of the isovector current leads to new features of the transition: i) the attenuation keeps a T 2 dependence, although with a change in the slope; ii) for large n -p friction the dipole mode can be fully damped before reaching the transition point. From a realistic estimation of relevant relaxation times we predict a transition around T = 3MeV in medium-heavy nuclei with detectable effects on the GDR 7yield in the direction of a better agreement with experiments.