Subjects: Physics >> Nuclear Physics submitted time 2024-04-08
Abstract： The study of nuclear isoscalar giant monopole resonance (ISGMR) is an important way to constrain nuclear incompressibility coefficient $K_ infty$, which provides important information for the understanding of nuclear astrophysics phenomena. At present, there is a serious discrepancy in the unified descriptions of the ISGMR in Pb and Sn isotopes, which prevents us from the accurate determination of $K_ infty$. In this paper, we reviewed the recent progress in understanding this problem within the framework of quasiparitcle random phase approximation as well as quasiparticle-vibration coupling models.
Subjects: Nuclear Science and Technology >> Nuclear Science and Technology submitted time 2024-01-22
Ma Jun
Li Ming
Zhang Pengqi
Bai Xiaohou
Wu Kang
Yu Xiaoxue
Han Yaning
Zhang Shiyu
Yao Zeen
Zhang Yu
Wang Junrun
Wei Zheng
Abstract： With the rapid development of fourth-generation nuclear reactors and new nuclear energy utilization systems, as well as advancements in research areas such as superheavy nucleus fusion mechanisms and fast neutron capture reactions in astrophysical nuclear physics, neutron-induced heavy nucleus fission studies and fission data measurements have become a significant topic of international nuclear physics research. In this study, we present the physical design of a neutron-induced fission spectrometer using the velocity-kinetic energy method(v-E). The MCP secondary electron time detector was designed with the spread of secondary electron flight time controlled at 50ps, and the TOF flight distance was designated for 70cm. For the energy detection, we selected the grid ionization chamber with isobutane as the working gas. The optimal approximation field strength was 6V/(cm·torr), and the atmospheric pressure was 37.5Torr. The energy response of the fission fragments in chamber was calculated by coupling programs such as COMSOL, Geant4, and Garfield++, and the energy resolution is from 0.36% to 0.55%. In a comprehensive analysis, the neutron-induced fission spectrometer based on the velocity-kinetic energy method designed in this work has an energy resolution of less than 0.8% for light fission fragments, less than 0.6% for heavy fission fragments, and the mass resolution of neutron-induced fission of heavy nuclei is less than 1amu. Additionally, based on the physical structure of the fission spectrometer, the mass distribution and charge distribution data of 238U fission yield induced by 14MeV neutron are simulated in this work, which is basically in agreement with the ENDF-VII, preparing the conditions for experimental measurements of neutron-induced fission physics of typical actinide heavy nuclei.
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