2018 Impact factor 2.481
Hadrons and Nuclei


Eur. Phys. J. A 10, 57-67

Discrete structures in fusion-barrier distributions for vibrational nuclei

A.Y. Abul-Magd and M.H. Simbel

Faculty of Science, Zagazig University, Zagazig, Egypt

a_y_abul_magd@hotmail.com

(Received: 6 March 2000 / Revised version: 19 December 2000 Communicated by A. Schäfer)

Abstract
We obtain a closed-form expression for the distribution of fusion barriers for vibrational nuclei using a generalization of Dasso, Landowne, and Winther's model, which represents the nuclear surface vibrations as a number of harmonic oscillators, and allows the excitation of an arbitrary number of phonons in the target and/or projectile. We find that this expression is in reasonable agreement with the average trends of the empirical distributions for the fusion of $\mathsf{^{16}O}$ with $\mathsf{^{92}Zr}$, $\mathsf{^{144}Sm}$ and $\mathsf{^{208}Pb}$, but fails to reproduce the double peaking of the distribution for the $\mathsf{^{144}Sm}$ target. Only when we restrict the number of excited phonons to a limited number, we are able to reproduce such discrete structures. We show that limiting the number of coupled channels, particularly in the case of strong coupling, increases the spacings between the channel eigenvalues that determine the positions of the peaks of the barrier distribution and modifies their heights.

PACS
25.70.Jj - Fusion and fusion-fission reactions.
24.10.-i - Nuclear-reaction models and methods.
25.70.-z - Low and intermediate energy heavy-ion reactions.
21.60.Ev - Collective models.

© Società Italiana di Fisica, Springer-Verlag 2001