2005 Fiscal Year Final Research Report Summary
Nuclear radii measurment of Kr isotopes with the fragment separator
| Project/Area Number |
16340063
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Saitama University |
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Principal Investigator |
SUZUKI Takeshi SAITAMA Univ., Science, Professor, 理学部, 教授 (10196842)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHINAGA Naotaka SAITAMA Univ., Science, Professor, 理学部, 教授 (00192427)
YAMAGUCHI Takayuki SAITAMA Univ., Science, Research Associate, 理学部, 助手 (10375595)
OHTSUBO Takashi NIIGATA Univ., Science, Associate Professor, 自然科学系, 助教授 (70262425)
IZUMIKAWA Takashi NIIGATA Univ., RI Center, Associate Professor, アイソトープ総合センター, 助教授 (60282985)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Nuclear radii / Kr isotopes / Reaction cross section / Glauber model / Skin structure / Production cross section |
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| Research Abstract |
We have performed the precision measurements of the interaction cross-sections for neutron deficient even-mass Kr isotopes using the ragment separator FRS at GSI in order to determine the nuclear radii of ^<72,76,80>Kr isotopes. We have so far succeeded several experiments to measure nuclear matter radii of light nuclei A<40. The measurements for Kr isotopes are an effort to extend a series of successful experiments to heavier nuclei A~80. To identify the particles unambiguously we have developed the ultra-fast timing plastic scintillation counters with the timing resolution of 13 ps in σ for ^<80>Kr beam at 1.05 AGeV.
The result of the interaction cross-sections of Kr isotopes clearly shows that the radii increase as the mass number decreases. This is clearly different from our early observations in the light region. A systematics of the radius changes in the medium mass region around theN=Z line is discussed together with the results of indirect measurements recently performed at GANIL. The proton skin thickness for the neutron-deficient Kr isotopes is for the first time compared with that observed in the light nuclei. In addition, the systematics of the production cross-sections and the charge pickup channels have been obtained.
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