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collisions at 
= 510 GeVKim, M. H.*; 谷田 聖; RHICf Collaboration*; 他23名*
Physical Review Letters, 124(25), p.252501_1 - 252501_6, 2020/06
被引用回数：5 パーセンタイル：45.09(Physics, Multidisciplinary)Transverse single-spin asymmetries of very forward neutral pions generated in polarized 
collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized 
+ collisions at = 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction 
and transverse momentum 
have been observed at low transverse momentum 
GeV/
for the first time at this collision energy. The asymmetries show an approximate scaling in the region where non-perturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.
Han, Y.*; 長谷川 勝一; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 杉村 仁志; 谷田 聖; J-PARC E42 Collaboration*; 他23名*
JPS Conference Proceedings (Internet), 8, p.021002_1 - 021002_5, 2015/09
The famed yet elusive H-dibaryon, an exotic quark state (
), was predicted several decades ago and also supported by recent Lattice QCD calculations. The E42 experiment has been approved at J-PARC to search for the H-dibaryon with high statistics. A large acceptance hyperon spectrometer with a time projection chamber (TPC) will be used for searching the H-dibaryon from 
reaction off nuclei via its possible following decays such as 
. The E42 experiment has high sensitivity both above and below threshold and will be the definitive experiment on the existence of the H-dibaryon, once and for all. Recent progress and achievements of the E42 collaboration will be presented, which include simulations on estimation of TPC performance in the electric field and the magnetic field, testing and optimization of a prototype TPC, and preparation of various detectors.
斎藤 伸三; 田中 利幸; 数土 幸夫; 馬場 治; 新藤 雅美; 塩沢 周策; 茂木 春義; 大久保 実; 伊藤 昇; 新藤 隆一; et al.
JAERI 1332, 247 Pages, 1994/09
現在原研は、高温ガス炉技術基盤の確立と高度化、高温における先端的基礎研究の実施を主な目的として、高温工学試験研究炉(HTTR)の建設を進めている。HTTRは、熱出力30MW、原子炉出口冷却材温度が定格運転時850
C、高温試験運転時950Cであり、燃料・材料の各種照射試験、安全性実証試験、核熱利用に関する試験研究を行うことが計画されている。本報は、平成2年11月にHTTRの安全審査が終了し、設置許可を受けたことから、主要機器の設計の概要をまとめるとともに、関連するR&D、安全評価等について報告するものである。
