Isoscalar compression modes within fluid dynamic approach

Journal Article · Thu Jun 01 04:00:00 EDT 2000 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.61.064302· OSTI ID:20216921

Kolomietz, V M ^[1]; Shlomo, S ^[2]

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1. Institute for Nuclear Research, 252028 Prospekt Nauki 47, Kiev-28, (Ukraine)
2. Cyclotron Institute, Texas A and M University, College Station, Texas 77843-3366 (United States)

We study the nuclear isoscalar monopole and dipole compression modes in nuclei within the fluid dynamic approach (FDA) with and without the effect of relaxation. For a wide region of the medium and heavy nuclei, the FDA predicts that the isoscalar giant monopole resonance (ISGMR) and the isoscalar giant dipole resonance (ISGDR) exhaust about 90% of the corresponding model-independent sum rules. In the case of neglecting the effect of relaxation, the FDA, when adjusted to reproduce the centroid energy E0 of the ISGMR, results with centroid energy E1 of the ISGDR which is in agreement with the predictions of the self-consistent Hartree-Fock random-phase approximation calculations and the scaling model but significantly larger than the experimental value. We also show that the FDA leads to the correct hydrodynamic limit for the ratio (E1/E0){sub FDA}. We find that the ratio (E1/E0){sub FDA} depends on the relaxation time and approaches the preliminary experimental value (E1/E0){sub exp}=1.5{+-}0.1 in a short relaxation time limit. (c) 2000 The American Physical Society.

• OSTI ID: 20216921
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 61; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPRESSION
DIPOLES
GIANT RESONANCE
HARTREE-FOCK METHOD
HYDRODYNAMIC MODEL
MONOPOLES
RANDOM PHASE APPROXIMATION
RELAXATION TIME
THEORETICAL DATA