Isotopic Dependence of the Giant Monopole Resonance in the Even- A Sn 112 – 124 Isotopes and the Asymmetry Term in Nuclear Incompressibility

University of Groningen, Groningen, Groningen, Netherlands
Physical Review Letters (Impact Factor: 7.51). 11/2007; 99(16):162503. DOI: 10.1103/PHYSREVLETT.99.162503
Source: PubMed


The strength distributions of the giant monopole resonance (GMR) have been measured in the even-A Sn isotopes (A=112-124) with inelastic scattering of 400-MeV alpha particles in the angular range 0 degrees -8.5 degrees . We find that the experimentally observed GMR energies of the Sn isotopes are lower than the values predicted by theoretical calculations that reproduce the GMR energies in 208Pb and 90Zr very well. From the GMR data, a value of Ktau = -550 +/- 100 MeV is obtained for the asymmetry term in the nuclear incompressibility.

Download full-text


Available from: Harutaka Sakaguchi, Jan 12, 2013
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Accurate assessment of the value of the incompressibility coefficient, K ∞, of symmetric nuclear matter, which is directly related to the curvature of the equation of state (EOS), is needed to extend our knowledge of the EOS in the vicinity of the saturation point. We review the current status of K ∞ as determined from experimental data on isoscalar giant monopole and dipole resonances (compression modes) in nuclei by employing the microscopic theory based on the Random Phase Approximation (RPA). The importance of full self-consistent calculations is emphasized. In recent years, a comparision between RPA calculations based on either non-relativistic effective interactions or relativistic Lagrangians has been pursued in great detail. It has been pointed out that these two types of models embed different ansatz for the density dependence of the symmetry energy. This fact has consequences on the extraction of the nuclear incompressibility, as it is discussed. The comparison with other ways of extracting K ∞ from experimental data is highlighted. PACS numbers21.65.+f–24.30.Cz–64.30.+t
    Preview · Article · Mar 2011 · Physics of Particles and Nuclei
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A phenomenological momentum-independent (MID) model is constructed to describe the equation of state (EOS) for isospin asymmetric nuclear matter, especially the density dependence of the nuclear symmetry energy E sym(ρ). This model can reasonably describe the general properties of the EOS for symmetric nuclear matter and the symmetry energy predicted by both the sophisticated isospin and momentum dependent MDI model and the Skyrme-Hartree-Fock approach. We find that there exists a nicely linear correlation between K sym and L as well as between J 0/K 0 and K 0, where L and K sym represent, respectively, the slope and curvature parameters of the symmetry energy at the normal nuclear density ρ 0, while K 0 and J 0 are, respectively, the incompressibility and the third-order derivative parameter of symmetric nuclear matter at ρ 0. These correlations together with the empirical constraints on K 0, L and E sym(ρ 0) lead to an estimation of −477 MeV ≤ K sat,2 ≤ −241 MeV for the second-order isospin asymmetry expansion coefficient for the incompressibility of asymmetric nuclear matter at the saturation point.
    Preview · Article · Oct 2009 · Science in China Series G Physics Mechanics and Astronomy
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The influence of modification of the effective mass of weakly interacting light boson (WILB) present in the compact hyperonic stars are investigated within the framework of the extended relativistic mean field model. It is found that the bulk properties of the hyperonic stars are compatible with the provided recent observational constraints, if the presence of the WILBs with appropriate effective mass is considered.
    Full-text · Article · Mar 2012 · Few-Body Systems
Show more