Subjects: Physics >> Nuclear Physics submitted time 2023-09-04 Cooperative journals: 《核技术》
Abstract： The first radioactive ion beam line, GIRAFFE, has been built at the CIAE HI-13 tandem accelerator in China. A total of eleven types of radioactive ion beam, including 6He, 7Be, and 8Li, have been generated. Several significant reactions in nuclear astrophysics have been indirectly measured via transfer reactions, and research on nuclear structure, relevant to nuclear astrophysics, has been performed using charge exchange reactions and thick-target experimental methods. A series of single nucleon or α cluster transfer reactions have been measured using a Q3D magnetic spectrometer, and the astrophysical S-factors and reaction rates for essential reactions have been obtained. The obtained results serve as a crucial experimental foundation for research involving element abundance and celestial body models.
Subjects: Physics >> Nuclear Physics submitted time 2024-09-03
Abstract：
Over the past two decades, astronomical observations of superbursts, initiated by the 12C+12C fusion reaction on the surfaces of neutron stars, have remained elusive by theoretical models based on the reaction rate of 12C+12C fusion reaction. Consequently, direct measurements for the cross section of the 12C+12C fusion reaction at energies well below Coulomb barriers have become a hot topic in nuclear astrophysics. For typical superbursts, the Gamow window energy of the 12C+12C fusion reaction is 1.5 ± 0.3 MeV, significantly lower than the Coulomb barrier. This makes it a huge challenge to directly measure the extremely low cross section of the fusion reaction in the corresponding energy region.The experiment by the Trojan Horse Method (THM) is the only measurement providing the excitation functions for all exit channels within the Gamow window. However, the experimental results still remain highly controversial at present. This work reviews the current status of measurement experiments for the 12C+12C fusion reaction and provides a novel interpretation of the data for THM. Combining the theory of identical boson systems, we discuss compound nuclear excited states in 24Mg extracted from THM, and the S* factor for the 12C+12C fusion reaction within the Gamow window. Furthermore, the reduced-width amplitude for the entrance channel of the 12C+12C fusion reaction within the Gamow window is suggested as =0.031.
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