Alpha-Like Clustering in Ne-20 from a Quartetting Wave Function Approach

摘要

Quartetting (alpha-like clustering) occurs in low-density matter (<= 0.03 fm(-3)) which exists, e.g., at the surface of nuclei. It is of interest for the alpha preformation to calculate the alpha decay of heavy nuclei such as Po-212, but also in light nuclei (e.g., Ne-20) which shows strong signatures of quartetting. We analyze the intrinsic structure of the -like cluster and the center-of-mass motion of the quartet, in particular the role of Pauli blocking. The Thomas-Fermi model for the (daughter) core nucleus is improved introducing quasiparticle nucleon states. Calculations performed for harmonic oscillator basis states show that the effective potential for the quartet center-of-mass motion remains nearly constant within the core nucleus. The relation to the (Tohsaki-Horiuchi-Schuck-Ropke) THSR approach is discussed.