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Role of Unitarity in EFT Descriptions of Low-Energy NN Scattering
인은진,박태선,홍승우 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.8
Cut-off regulators in the effective field theory (EFT) description of a low-energy NN scattering often violates unitarity. To understand the phenomenological consequences of such a violation of unitarity, we have performed a comparative study for the 1S0 np scattering up to next-to-leading order with five different forms of regulators, some of which preserve unitarity while others do not. For this aim, we have considered two different types of EFTs; one is the EFT that consists of only nucleonic degrees of freedom, and the other is the EFT with a dibaryon field. For both types of EFTs, unitarity-preserving regulators turn out generally to produce phase shifts in better agreement with the data than unitarity-violating regulators do.
함철민,김도윤,인은진,Sang-In Bak,신재원,오세영,차반 비벡,채경육,김양규,Jounghwa Lee,이민규,문달호,박태선,홍승우 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.10
A MICROMEGAS (MICRO Mesh GASeous) detector is developed to monitor neutrons with a continuous energy spectra generated by bombarding protons on a thick Be target at the MC-50 cyclotron of the Korea Institute of Radiological and Medical Sciences (KIRAMS). Two different neutron spectra are produced by protons of 20 and 40 MeV, and are detected by using the MICROMEGAS detector with a boron converter. Boron carbides (B4C) are deposited on the cathode of the detector and are used as a neutron-to-charged particle converter. α particles and 7Li nuclei produced by the 10B(n,α)7Li reaction are detected by using the MICROMEGAS detector. Monte Carlo simulations for the detector system are performed to compare the experimental data with the simulation results. For measuring the energies of the α particles and the 7Li nuclei, we vary the geometry of detector in both the simulations and the experiments to fully stop the α particles and the 7Li nuclei in the detector. The changes of the positions of the α and the 7Li peaks observed in the distribution of the deposited energy for different detector geometries agree more or less with those from the simulation results. The neutron conversion efficiency of the detector is studied.