Nonmicroscopic and microscopic descriptions of condensate states in the 12C and 16O nuclei

10th International Conference on Clustering Aspects of Nuclear Structure and Dynamics

Dufour, Marianne^1 ; Lazauskas, Rimantas^1 ; Descouvemont, Pierre^2

IPHC Bat.27, IN2P3-CNRS/Université Louis Pasteur, BP28, F-67037 Strasbourg Cedex 2, France^1

Physique Nucléaire Théorique et Physique Mathématique, Université Libre de Bruxelles (ULB), C.P. 229, B 1050 Brussels, Belgium^2

关键词: Common features;    Configuration space;    Faddeev equations;    Generator coordinate methods;    Microscopic description;    Nonlocal potentials;    Phase-shift analysis;    Theoretical framework;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/436/1/012005/pdf
DOI  :  10.1088/1742-6596/436/1/012005

来源: IOP

【 摘 要 】

12C and16O nuclei are investigated within nonmicroscopic and microscopic theoretical frameworks, respectively. For the12C nucleus viewed as a 3α system, 3-body Faddeev equations are solved in configuration space. Positions of the resonant states are obtained through the complex scaling method. We show that the nonlocal potential developed by Z. Papp and S. Moszkowski appears to be well-adapted to study 3α system. In particular, we show evidence for12C states of positive-parity which share common features with the well-known 0+2Hoyle state, currently interpreted as a condensate state. For the16O nucleus, a12C+α multicluster generator coordinate method is used to solve the 16-nucleon problem. The16O nucleus is described by four α cluster. We comment the difficulty to interpret broad resonant states. The phase-shift analysis of the12C(02+) + α channel reveals the existence of two 0+states located above the 4α threshold which can be interpreted as condensate states.