High-precision measurement of total fission cross sections in spallation reactions of $^{208}Pb$ and $^{238}U$
High-precision measurement of total fission cross sections in spallation reactions of $^{208}Pb$ and $^{238}U$
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高精度测量 $^{208}Pb$ 和 $^{238}U$ 散裂反应中的总裂变截面
DOI：
10.1103/physrevc.87.034601
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
C. Schmitt
中科院分区：
文献类型：
--
作者：
K. Schmidt;B. Jurado;R. Pleskac;M. Ricciardi;J. Benlliure;T. Enqvist;F. Farget;A. Bacquias;L. Giot;Vlad Henzl;D. Henzlova;A. Kelić;S. Leray;S. Lukić;Son Nguyen Ngoc;A. Boudard;E. Casarejos;M. Fernández;T. Kurtukian;P. Nadtochy;D. Pérez;C. Schmitt
在500 MeV ~ 1 GeV能量范围内，测量了~（208）Pb和~（238）U的质子和氘致裂变总截面。该实验已在GSI达姆施塔特的逆运动学中进行，便于对射弹的计数和反应产物的识别。通过单独计数束粒子并以高效率和全Z分辨率记录两个裂变碎片，实现了5%至7%的高精度。裂变与其他反应通道有明显区别。结果被发现偏离普罗科菲耶夫的总裂变截面系统高达30%。有很好的协议与一个精心设计的实验进行的正向运动学。
Total cross sections for proton- and deuteron-induced-fission of 208Pb and 238U have been determined in the energy range between 500 MeV and 1 GeV. The experiment has been performed in inverse kinematics at GSI Darmstadt, facilitating the counting of the projectiles and the identification of the reaction products. High precision between 5 and 7 percent has been achieved by individually counting the beam particles and by registering both fission fragments in coincidence with high efficiency and full Z resolution. Fission was clearly distinguished from other reaction channels. The results were found to deviate by up to 30 percent from Prokofiev's systematics on total fission cross sections. There is good agreement with an elaborate experiment performed in direct kinematics.