EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 7, 483-490

Microscopic analysis of the breathing mode in 40Ca and 58Ni

S. Kamerdzhiev1,2 - J. Speth1 - G. Tertychny1,2

1 Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
2 Institute of Physics and Power Engineering, 249020 Obninsk, Russia

Received: 23 December 1999 / Revised version: 28 February 2000 Communicated by P. Schuck

Abstract
Recent experimental studies of the giant electric resonance region in 58Ni and 40Ca with inelastically scattered $\alpha$-particles of energy E$_{\alpha}$ = 240 MeV are analyzed within a microscopic nuclear structure model.
to 0pt    The model includes the continuum RPA and more complex 1p1h$\otimes$phonon configurations. By superimposing the contributions of different multipoles up to L = 4 we obtain good agreement with the newest (reanalyzed) data for the isoscalar monopole strength and for the total ( $\alpha,\alpha'$) cross section in 58Ni. Agreement with experiment for the isoscalar monopole resonance in 40Ca is obtained too. We emphasize the necessity of using microscopic transition densities and discuss consequences for the analyses of such experiments in light and medium mass nuclei. It is shown that the gross structure of the isoscalar monopole resonance in 40Ca is caused by the 1p1h$\otimes$phonon configurations.

PACS
24.30.Cz Giant resonances - 25.55.Ci Elastic and inelastic scattering - 27.40.+z $39 \le A \le 58$

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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