Ex) Article Title, Author, Keywords
Abstract : New Physics searches using a high energy collider experiment should be performed systematically, especially when interpreting a new signal with a specific new Physics model among different possibilities. A data-driven method should be used in a model-independent way to capture all scenarios. In this article, we demonstrate how one can achieve a systematic and model-independent data analysis by separating an analysis on a new Physics signature into a phase space structure and matrix amplitude of a process. For instance, we consider a process with two visible particles and dark matter candidate signal at the high energy hadron collider. Finally, we recommend a proposed method to combine with a machine learning network and an algorithm to probe the broad scope of Physics beyond the standard model efficiently.
Abstract : The radiative proton capture on 15N targets, i.e., 15N(p, γ)16O, is an important thermonuclear reaction of the CNO cycle in stellar environments. This reaction is a key process in the cycle because it initiates the NO cycle by producing 16O. In this study, we investigated the 15N(p, γ)16O reaction within the framework of cluster effective field theory. We construct an effective Lagrangian to describe the reaction at stellar energies and calculate the astrophysical S factor. The parameters of our calculations, such as low-energy constants, resonance energy, and decay width of the 16O resonance are determined by fitting empirical data of the S factor at the range of 72.8 keV ≤ Ecm ≤ 368.3 keV. The S factor value for this reaction at extremely low energy is then determined to be S(E=0) = 30.4 keV·b, which is consistent with the estimates of R-matrix approaches.
Abstract : Epitaxial nickel cobaltite (NiCo2O4) (110) films were grown on magnesium aluminate (MgAl2O4) (110) at oxygen pressures ranging from 5 to 200 mTorr using pulsed laser deposition. Using X-ray diffraction, a shift in the (110) peak to a lower angle was suggested to have occurred as the oxygen pressure increased with a relatively large change in interplanar spacing at approximately 20 mTorr. The rocking curve supported the view that NiCo2O4 films had high crystallinity, and atomic force microscopy images suggested that films had few irregularities below 1 nm. The measurement of the magneto-optic Kerr effect suggested that the NiCo2O4 films were ferrimagnetic at room temperature and possessed a distinctive uniaxial in-plane magnetic anisotropy. As the oxygen pressure increased, the ferrimagnetic-to-paramagnetic transition temperature increased from ~305 to ~365 K. All of the films displayed metallic and ferrimagnetic properties. Consequently, an increase in oxygen pressure is likely to induce a decrease in oxygen defects and an increase in nickel(III) ion occupation of the octahedral sites, resulting in strengthening of the ferrimagnetic properties. In addition, this will presumably enhance lattice strain, resulting in a reinforcement of the magnetic anisotropy due to spin-lattice coupling.
Abstract : This study aimed to explore the potential and likely significance of introducing the action concept to college physics education. To do so, this study theoretically examined the usefulness of the action concept for learning physics, and then tested 39 pre-service physics teachers' understanding of the action concept. Their mean score for understanding a list of concepts related to the action concept was only 27%, and their understanding of action concepts that were related to possibility, path, and complex functions was particularly low. Although the most frequent question pattern was random model, in which both the score and concentration were low, some questions were analyzed into two model pattern, thereby highlighting the potential for misunderstanding occurring. There was a significant difference in the mean scores according to the physics-related subjects that the respondents had taken. The introduction of the action concept in college physics education has significance in that it can serve as an alternative explanation tool in both classic and quantum mechanics, and it is a concept that cuts across and connects classic and modern physics.
Abstract : SND@LHC is a new LHC experiment that measures neutrino production at the LHC and searches for feebly interacting particles. The experiment detects neutrinos with energies of 100 GeV - TeV using a hybrid detector of ECC composed of emulsion interleaved with tungsten target followed downstream by a muon system. SND@LHC measures neutrino production cross sections for three flavors and allows the examination of neutrino interactions in a pseudo-rapidity region of 7.2 < η < 8.6. The detector also functions to search for feebly interacting particles. SND@LHC is operated to collect 150 fb-1 of data for three years during Run 3 of the LHC to observe about 2,000 neutrinos.
Byeong-Hyeon JEONG, Ji-Sang PARK*
New Phys.: Sae Mulli 2020; 70(8): 630-636
Woo Tae Hong, Hyun Kyoung Yang
New Phys.: Sae Mulli 2021; 71(3): 236-241
Hyeong Seon PARK, Seong-Heum PARK, Hyunbok LEE, Heung-Sik KIM*
New Phys.: Sae Mulli 2020; 70(11): 920-927