Measurement of (n,伪) reactions on ¹⁴⁷Sm and ¹⁴⁹Sm using a lead slowing-down spectrometer

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• 作者：J.T. Thompson^a ; ^{thompj@rpi.edu} ; T. Kelley^b ; E. Blain^a ; R.C. Haight^c ; J.M. O'Donnell^c ; Y. Danon^a
• 关键词：(n ; 伪) ; Lead slowing-down spectrometer ; Digitizer ; Compensated detectors ; Samarium ; Sm-147 ; Sm-149
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：2012
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：1 May, 2012
• 卷：673
• 期：Complete
• 页码：16-21
• 文件大小：731 K

摘要

The lead slowing-down spectrometer (LSDS) at Rensselaer Polytechnic Institute (RPI) was used to extend previous measurements of the (n,伪) cross section on ¹⁴⁷Sm and perform measurements on ¹⁴⁹Sm over the energy range 0.1 eV-10 keV. A compensated detector based on passivated implanted planar silicon (PIPS) detectors was constructed. Signals from two detectors were combined in opposite polarity and digitized providing a single detector capable of discriminating against capture 纬's and 鈥?em>纬-flash鈥?while preserving the discrete signals produced by 伪 events and providing a simultaneous background measurement. Extrapolating the results predicts a 0.3卤0.3 mbarn and 11.5卤1.1 mbarn thermal neutron (n,伪) cross section for ¹⁴⁷Sm and ¹⁴⁹Sm, respectively. This measurement provides new information on (n,伪) reaction cross sections. The method of measuring neutron induced charged particle emission cross sections presented here can be expanded to more isotopes of interest to reactor engineers or astrophysicists, as well as to (n,p) reactions.