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Position reconstruction in fission fragment detection using the low pressure MWPC technique for the JLab experiment E02-017

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Chinese Physics C 2014年第7期38卷 22-29页

作者：邱玺玉 L.Tang A.Margaryan 徐进章胡碧涛陈熙萌 School of Nuclear Science and Technology Lanzhou University Department of Physics Hampton University Thomas Jefferson National Accelerator Facility Newport News VA 23606 USA Yerevan Physics Institute School of Electrical and Automation Hefei University of Technology

When a A hyperon is embedded in a nucleus it can form a hypernucleus. The lifetime and its mass dependence of stable hypernuclei provide information about the AN interaction in the nuclear medium. This work will introduce the Jefferson Lab experiment （E02-017）, which aims to study the lifetime of the heavy hypernuclei using a specially developed fission fragment detection technique： a multi-wire proportional chamber operating under low gas pressure （lpmwpc）. The trajectory of the detected fragment is reconstructed and used to find the fission point on the target foil, the position resolution is less than I ram, which meets the original design, the separation of target materials and events mixture percentage in different regions are verified by Monte Carlo simulation.

关键词： hypernuclei decay lpmwpc fission fragment position reconstruction

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Performance test of the low-pressure thin window multi-wire chamber

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Chinese Physics C 2014年第2期38卷 57-60页

作者：张俊伟鲁辰桂段利敏马龙胡荣江杨贺润马朋甘再国 University of Chinese Academy of Sciences Institute of Modern Physics Chinese Academy of Sciences

A flow gas low-pressure multi-wire proportional chamber（lpmwpc） with an active area of 180 mm× 80 mm has been developed for the flying time test of the recoil nuclei on super heavy nuclear experiments. The lpmwpc detector can be operated in single as well as double step operational modes. In the case of double step operational mode with a high gas amplification factor, signals from α-particles reside well above the electronic noise. The gas leakage rate and time resolution obtained from the α239Pu source are shown and discussed at the condition of 3 mbar Isobutane gas. It was shown that the time resolution was better than 2.9 ns at the best work condition, and the detecting efciency was larger than 98% at the low energy α particles. So the lpmwpc is fit to measure the flying time in the super heavy nuclear fragments experiment.

关键词： lpmwpc gas leakage rate time resolution detecting efciency

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