Measurement of Tidal Deformability in the Gravitational Wave Parameter Estimation for Nonspinning Binary Neutron Star Mergers
Yong-Beom Choi1, Hee-Suk Cho1, Chang-Hwan Lee1, Young-Min Kim2
1 Department of Physics, Pusan National University, Busan 46241, Korea 
2 Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
One of the main targets for the ground-based gravitational wave (GW) detectors such as Advanced LIGO and Virgo is coalescences of neutron star (NS) binaries. The tidal deformability of a NS, which depends on the internal structure of the NS, has been recently obtained from GW observations. In this work, we investigate the measurement errors for mass and tidal deformability in GW parameter estimation by using the Fisher matrix method. We use a post-Newtonian (PN) waveform model in which the tidal deformability contribution appears from 5 PN order. The figure shows that if the tidal deformability corrections are considered up to the 6 PN order, the measurement error for the dimensionless tidal deformability can be reduced to about 75% compared to that obtained by considering only the 5 PN order correction.
J. Korean Phys. Soc. 2019; 74: 842-846
First-Principles Study of the Influence of Zirconium on the Diffusion of Uranium Defects in Uranium Dioxide
Huan Wang1, Yu Zou1, Zhong Zhang1, Kai-Yuan Wang1, Huan An1, Chang-Yong Zhan1, Jun Wang1, Jian-Chun Wu1,2
1 Key Laboratory of Radiation Physics and Technology of Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610065, China
2 School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China
Zirconium is inevitably introduced into UO$_2$ during reactor operation. Here, the migration properties of uranium vacancies and interstitials in zirconium-doped uranium dioxide are studied by using density functional theory and the climbing-image nudge elastic band methods. We find that the doping of zirconium obviously reduces the migration barriers of defects in uranium dioxide. Further, we investigated the lattice distortion and electron transfer associated with the migration of uranium defects. The calculations of bond-length and pressure show that the small ionic radius of Zr$^{4+}$ is responsible for the reduction of the migration barriers of U defects.
J. Korean Phys. Soc. 2019; 74: 795-800
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