arXiv:nucl-th/0207022·v1·Nuclear Theory
Description of 8Be as Deformed Gas-like Two-Alpha-Paricle States
Yasuro Funaki (1) · Hisashi Horiuchi (1) · Akihiro Tohsaki (2) · Peter Schuck (3) · Gerd Röpke (4) ((1) Kyoto University, Japan, (2) Sinsyu University, Japan, (3) Institut de Physique Nucleaire, France (4) Universität Rostock, Germany)
Abstract
In order to study non-zero spin excitations of the recently proposed alpha-cluster condensation in the self-conjugate 4n nuclei, spatial deformation is introduced into the model wave function of the alpha-cluster condensate. The rotational band states of 8Be are investigated as a first step of a test case for the study of the deformation of the alpha-cluster condensate. Calculations reproduce well the binding energy of the 0+ ground state and also the excitation energy of the 2+ state. Our 0+ wave function is found to be almost exactly equal to the 0+ wave function obtained by the generator coordinate method using Brink's 2 alpha wave function. The study shows that both the 0+ ground and 2+ excited states can be considered as having a gas-like (i.e. weakly bound) 2 alpha-cluster structure. As for the 0+ ground state, the change of the wave function, due to the introduction of the deformation, is found to be very small.
Comments: 20 pages, 14 EPS figures