2013 Fiscal Year Final Research Report
Study of hadron mass origin through simultaneous measurements of generations and decays of meson bound states in nucleus
| Project/Area Number |
23244048
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (A)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | High Energy Accelerator Research Organization |
|---|
Principal Investigator |
OZAWA Kyoichiro 大学共同利用機関法人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 (20323496)
|
|---|
| Project Period (FY) |
2011-04-01 – 2014-03-31
|
| Keywords | 実験核物理 / ハドロン質量起源 / カイラル対称性 / 対称性の自発的破れ / ω中間子 / γ線検出器 / 円筒型ドリフトチェンバー / MPPC |
|---|
| Research Abstract |
In this research project, we perform an experiment to study a process of a dynamical mass generation of hadrons. The experiment aims to measure clearly bind states and invariant mass spectra of omega mesons in nucleus, simultaneously. Detectors used in the experiment are gamma-ray detectors (BGO EGG), thin scintillators and a cylindrical drift chamber (CDC). The CDC has a narrow drift length (1.25mm) and it is difficult to design and manufacture the CDC. Constructions of these detectors are finished. We evaluate performances of these detectors using a gamma-ray beam at Spring-8. The detectors show enough performances for our experiment. Achieved energy resolution of the BGO EGG for a gamma-ray of 1 GeV energy is 1.2 % and a reconstruction of neutral pi meson is already succeeded using data taken at Spring-8. Physics data to search for a bind state of omega mesons in nucleus are collected using a carbon target and a gamma-ray beam at Spring-8 LEPSII.
|
