Systematic Study of Double-Hypernuclei with Nuclear Emulsion

2015 Fiscal Year Final Research Report

• Project/Area Number: 23224006
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Gifu University
• Principal Investigator: nakazawa kazuma 岐阜大学, 教育学部, 教授 (60198059)
• Co-Investigator(Kenkyū-buntansha): HOSHINO Kaoru 岐阜大学, 教育学部, 非常勤講師 (70022738) ; TANIDA Kiyoshi 日本原子力研究開発機構, 先端基礎研究センター, 研究副主幹 (00360587) ; TAKAHASHI Hitoshi 高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (60353372) ; WATABE Toyoki 名古屋大学, 大学院理学研究科, 技術専門員 (20402422) ; HIYAMA Emiko 理化学研究所, 仁科加速器研究センター, 准主任研究員 (10311359)
• Co-Investigator(Renkei-kenkyūsha): TAMURA Hirokazu 東北大学, 大学院理学研究科, 教授 (10192642) ; IMAI Kenichi 日本原子力研究開発機構, 先端基礎研究センター, 客員研究員 (70025493)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 原子核(実験) / ダブルハイパー核 / エマルション / 全面スキャン / SSD / 少数多体計算

Outline of Final Research Achievements

Fully automated systems were successfully built for following Xi- particles and for whole-area scanning to detect double-hypernuclei in nuclear emulsion with speed in several hundreds’ faster than the past one. The later system gave us an evidence for the presence of Xi-hypernucleus (named KISO Event), for the first time in the world, in the emulsion of the previous experiment, and then we found that an attractive nuclear-force would play between Xi- particle and nucleus.
In preparation of the E07 experiment at J-PARC, we made emulsion plates of 2.1 ton Gel and stocked them in the KAMIOKA mine, and it was achieved for driving solid-state tracking detector, X-ray detector (Hyperball-X) and detectors along the beam line. Therefore our experiment is recommended to run beam exposure in 2016 with the top priority. In theoretical research, it was pointed out that repulsive-force effect of p-wave on the Lambda-Lambda interaction had a great influence on the maximum mass of the neutron star.

Free Research Field

素粒子・原子核・宇宙線・宇宙物理