Measurement of neutron cross sections and resonance parameters of ~(169)Tm below 100 eV

• 作 者: 王文明 李霞 赵志祥 周祖英 于洪伟 吴海成 魏义祥 T.F. Wang G.N. Kim M.W. Lee K.S. Kim M.H. Cho I.S. Ko W. Namkung
• 机 构: China Institute of Atomic Energy,Department of Engineering Physics,Tsinghua University,Department of
• 出 处: 中国物理C
• 发表日期: 2004年期
• 关键词: neutron sections linac notch cooled isotope gamma thick sheets recommended

The neutron total cross-sections of thulium(169Tm) were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility,which consists of an electron linac,a water-cooled tantalum target with a water moderator,and a 12 m time of flight path.Two thulium plates with different thicknesses were used for the neutron transmission measurement.The background level was determined by using a notch-filter of Co,In,and Cd sheets.The present measurement was compared with the previous ones,and a new set of resonance parameters of 169Tm isotope was obtained from the transmission rate by using the SAMMY code,with a comparison with the recommended parameters by Mughabghab.

The neutron total cross-sections of thulium (169Tm) were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility, which consists of an electron linac, a water-cooled tantalum target with a water moderator, and a 12 m time of flight path. Two thulium plates with different thicknesses were used for the neutron transmission measurement. the background level was determined by using a notch-filter of Co, In, and Cd sheets. The present measurement was compared with the previous ones, and a new set of resonance parameters of 169Tm isotope was obtained from the transmission rate by using the SAMMY code, with a comparison with the recommended parameters by Mughabghab.