Experimental Challenge to the vp-Process in Type II Supernovae

8th European Summer School on Experimental Nuclear Astrophysics (Santa Tecla School)

物理学;天文学

Kubono, S.^1,2,3

RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama

351-0198, Japan^1

Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, China^2

Center for Nuclear Study, University of Tokyo, 2-1 Hirosawa, Wako, Saitama

351-0198, Japan^3

关键词: Key process;    Level density;    Low energy RI beams;    Neutron-induced reactions;    Nuclear astro-physics;    Nuclear structure;    Nuclei around;    Simulation studies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/703/1/012009/pdf
DOI  :  10.1088/1742-6596/703/1/012009

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The vp-process is a new nucleosynthetic scenario, proposed 2006, which supposed to take place at the very early epoch of type II supernova, involving nuclear reactions of proton-rich nuclei not only with protons and alphas, but also with neutrons due to the neutrino processes. The vp-process is one of the key processes for investigating the mechanism of type II supernovae, and the process could be possibly responsible for the anomalously abundant p-nuclei around mass 90-100. Specifically, the nuclear physics problems in the vp-process were discussed in this talk including our recent experimental results with low-energy RI beams and a simulation study. Alpha cluster resonances have been identified experimentally which play a crucial role for the stellar (α,p) and (α,γ) reactions just above the alpha threshold. Neutron induced reactions in the proton-rich nuclear regions in the vp-process are also suggested to play an important role, which will discard the waiting points, and accelerate the flow to heavier nuclei. This process involves nuclear structures of very high level density at high excitation energies in neutron deficient nuclei, and both of the projectile and the target are unstable, which is a quite difficult experimental challenge in nuclear astrophysics in the coming years. Some experimental challenges are discussed.