Cluster states and container picture in light nuclei, and triple-alpha reaction rate

NUBA Conference Series -1: Nuclear Physics and Astrophysics

物理学;天文学

Funaki, Yasuro^1

RIKEN, Nishina Center, Wako

351-0198, Japan^1

关键词: Cluster model calculation;    Cluster state;    Coupled channels;    Extended versions;    Light nuclei;    Low temperatures;    Radiative capture;    Triple alpha reaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/590/1/012002/pdf
DOI  :  10.1088/1742-6596/590/1/012002

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The excited states in12C are investigated by using an extended version of the so- called Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function, where both the 3α condensate and8Be + α cluster asymptotic configurations are included. We focus on the structures of the "Hoyle band" states, 2+2, and 4+2 states, which are recently observed above the Hoyle state, and of the 0+3 and 0+4 states, which are also quite recently identified in experiment. We show that the Hoyle band is not simply considered to be the8Be(0+) + α rotation as suggested by previous cluster model calculations, nor to be a rotation of a rigid-body triangle-shaped object composed of the 3α particles. We also discuss the rate of the triple-alpha radiative capture reaction, applyng the imaginary-time method. Results of the triple-alpha reaction rate are consistent with NACRE rate for both high (≈ 109K) and low (≈ 107K) temperatures. We show that the rate of the imaginary-time calculation in coupled-channels approach has a large enhancement for low temperatures if we truncate the number of channels.