Theoretical Description of Collective Motion in Nuclei: Shell Model and ApproximationsNo Access

LOW-LYING EXCITATION MODES IN DEFORMED NEUTRON-RICH NUCLEI

KENICHI YOSHIDA

Nishina Center for Accelerator-Based Science, The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan

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https://doi.org/10.1142/S0218301308011914Cited by:0 (Source: Crossref)

Abstract

Low-frequency modes of excitation in deformed neutron-rich nuclei are studied by the use of the deformed quasiparticle-random-phase approximation (QRPA) based on the coordinate-space Hartree–Fock–Bogoliubov formalism. We investigate the microscopic structure of the low-lying K^π = 0⁺ modes in neutron-rich Mg, Cr and Fe isotopes. It is found that the spatially extended structure of neutron quasiparticle wave functions around the Fermi level brings about a striking enhancement of the transition strengths. It is also found that the fluctuation of the pairing field plays an important role in generating coherence among two-quasiparticle excitations of neutron. Recent progress towards the self-consistent deformed QRPA calculation using the Skyrme density functional is also presented.

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LOW-LYING EXCITATION MODES IN DEFORMED NEUTRON-RICH NUCLEI

Abstract

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