Nuclear radii measurment of Kr isotopes with the fragment separator

为了确定~(72，76，80)~(gt；Kr)同位素的核半径，我们在GSI用拉格分离器FRS精确测量了贫中子偶质量Kr同位素的相互作用截面。到目前为止，我们已经成功地进行了几次测量轻核核物质半径的实验。对Kr同位素的测量是将一系列成功的实验扩展到更重的核A~80的努力。为了明确地识别粒子，我们在σ上研制了时间分辨率为13ps的超快定时塑料闪烁计数器，用于1.05AGeV的~&lt；80&gt；Kr束流。Kr同位素相互作用截面的结果清楚地表明，半径随着质量数的减小而增大。这显然不同于我们在光区的早期观察。讨论了THEN=Z线附近中等质量区半径变化的系统学，以及最近在GANIL进行的间接测量的结果。首次将缺乏中子的Kr同位素的质子皮厚度与轻核中观测到的质子皮厚度进行了比较。此外，还得到了生产截面和电荷拾取通道的系统信息。

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.