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1,146 results on '"Shim Sang-In"'

1. J-PARC hadron experimental facility extension project

Author

Sakuma Fuminori, Aoki Kazuya, Fujioka Hiroyuki, Gogami Toshiyuki, Hidaka Yoshimasa, Hiyama Emiko, Honda Ryotaro, Hosaka Atsushi, Ichikawa Yudai, Ieiri Masaharu, Isaka Masahiro, Ishii Noriyoshi, Ishikawa Takatsugu, Komatsu Yusuke, Komatsubara Takeshi, Lim GeiYoub, Miwa Koji, Morino Yuhei, Nagae Tomofumi, Nagao Sho, Nakamura Satoshi N., Nanjo Hajime, Naruki Megumi, Nemura Hidekatsu, Nomura Tadashi, Noumi Hiroyuki, Ohnishi Hiroaki, Ozawa Kyoichiro, Sawada Shinya, Sekihara Takayasu, Shim Sang-In, Shiomi Koji, Shirotori Kotaro, Tajima Yasuhisa, Takahashi Hitoshi, Takahashi Toshiyuki, Takeuchi Sachiko, Takizawa Makoto, Tamura Hirokazu, Tanida Kiyoshi, Ukai Mifuyu, Yamamoto Takeshi O., and Yamamoto Yasuo

Subjects
Physics, QC1-999
Abstract

The J-PARC Hadron Experimental Facility was constructed with an aim to explore the origin and evolution of matter in the universe through experiments with intense particle beams. In the past decade, many results from particle and nuclear physics experiments have been obtained at the present facility. To expand the physics programs to as yet unexplored regions, the extension project of the Hadron Experimental Facility has been extensively discussed. This contribution presents the physics of the extension of the Hadron Experimental Facility to resolve issues related to strangeness nuclear physics, hadron physics, and flavor physics.

Published
2022
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2. Stability of Hydrides in Sub-Neptune Exoplanets with Thick Hydrogen-Rich Atmospheres

Author

Kim, Taehyun, Wei, Xuehui, Chariton, Stella, Prakapenka, Vitali B., Ryu, Young-Jay, Yang, Shize, and Shim, Sang-Heon

Subjects
Astrophysics - Earth and Planetary Astrophysics, Condensed Matter - Materials Science
Abstract

Many sub-Neptune exoplanets have been believed to be composed of a thick hydrogen-dominated atmosphere and a high-temperature heavier-element-dominant core. From an assumption that there is no chemical reaction between hydrogen and silicates/metals at the atmosphere-interior boundary, the cores of sub-Neptunes have been modeled with molten silicates and metals (magma) in previous studies. In large sub-Neptunes, pressure at the atmosphere-magma boundary can reach tens of gigapascals where hydrogen is a dense liquid. A recent experiment showed that hydrogen can induce the reduction of Fe$^{2+}$ in (Mg,Fe)O to Fe$^0$ metal at the pressure-temperature conditions relevant to the atmosphere-interior boundary. However, it is unclear if Mg, one of the abundant heavy elements in the planetary interiors, remains oxidized or can be reduced by H. Our experiments in the laser-heated diamond-anvil cell found that heating of MgO + Fe to 3500-4900 K (close to or above their melting temperatures) in a H medium leads to the formation of Mg$_2$FeH$_6$ and H$_2$O at 8-13 GPa. At 26-29 GPa, the behavior of the system changes, and Mg-H in an H fluid and H$_2$O were detected with separate FeH$_x$. The observations indicate the dissociation of the Mg-O bond by H and subsequent production of hydride and water. Therefore, the atmosphere-magma interaction can lead to a fundamentally different mineralogy for sub-Neptune exoplanets compared with rocky planets. The change in the chemical reaction at the higher pressures can also affect the size demographics (i.e., "radius cliff") and the atmosphere chemistry of sub-Neptune exoplanets.

Published
2024
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3. Structural evolution of liquid silicates under conditions in Super-Earth interiors

Author

Morard, Guillaume, Hernandez, Jean-Alexis, Pege, Clara, Nagy, Charlotte, Libon, Lélia, Lacquement, Antoine, Sokaras, Dimosthenis, Lee, Hae Ja, Galtier, Eric, Heimann, Philip, Cunningham, Eric, Glenzer, Siegfried H., Vinci, Tommaso, Prescher, Clemens, Boccato, Silvia, Chantel, Julien, Merkel, Sébastien, Zhang, Yanyao, Yang, Hong, Wei, Xuehui, Pandolfi, Silvia, Mao, Wendy L., Gleason, Arianna E., Shim, Sang Heon, Alonso-Mori, Roberto, and Ravasio, Alessandra

Published
2024
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