2001 Fiscal Year Final Research Report Summary
Study on Hot Nuclear Matter by Using Light Heavy-Jon Beams
| Project/Area Number |
11440078
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MURAKAMI Tetsuya Kyoto Univ. Graduate School of Science, Instructor, 大学院・理学研究科, 助手 (50219896)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Kazuhiro KEK Institute of Particle and Nuclear Studies Asso. Professor, 素粒子原子核研究所, 助教授 (90171743)
NAKAMURA Masanobu Kyoto Univ. Graduate School of Science, Lecturer, 大学院・理学研究科, 講師 (90025479)
IMAI Kenichi Kyoto Univ. Graduate School of Science, Professor, 大学院・理学研究科, 教授 (70025493)
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| Project Period (FY) |
1999 – 2001
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| Keywords | hot nuclear matter / large acceptance counter array / target multifragmentation / Broggy Curve Counter |
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| Research Abstract |
We have extended our research on a nature of "hot nucleo matter" by using CeV energy light heavy-ion beams provided from the HIMAC at the National Institute of Radiological Sciences(NIRS) together with a large acceptance Bragg Curve Counter away. We have also improved our ability to analyze large amount of data obtained from 8 and 12 GeV proton induced target multifragmentation experiments performed at the KEK-PS by introducing a new fast DOS/V PC and a large-volume hard disc array.
In 1999 and 2000, we have measured the target multifragmentation (TMF) reaction induced by 400 and 600 MeV/nucleon ^<20>Ne and 500 MeV/nucleon ^<16>O. All of the inclusive energy spectra of intermediate mass fragments (Z>3; IMF) show usual Maxwell-Boltzmann distribution-like shapes, but their absolute cross sections are about 4 times larger than those for 12 GeV proton induced TMF. Angular distributions of IXIFs show predominantly forward peaking nature, but there were small amounts of sideward peaking components resemble to those observed in the proton induced TMF, especially for heavy IMFs.
In 2002 we have also investigated a possibility to extend our studies on the TMF reaction induced by GeV-energy light projectiles, to those induced by slightly heavier projectiles, like ^<28>Si and/or ^<40>Ar. After several attempts we managed to reduce background to S/N=2 for the 800 MeV/nucleon ^<28>Si induced TMF on gold target, which was barely acceptable to obtain production cross sections for intermediate mass fragments (IMFs). The analysis is still in progress.
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