Abstract
It is necessary to accurately measure the kinetic energy of fission fragments when using the Time-Of-Flight method to determine the mass of fission fragments. The ionization chamber and the Au-Si surface barrier detector are conventional kinetic-energy detectors, but their energy resolution is not sufficient to achieve a mass resolution of 1 amu. The Transition-Edge Sensor (TES) is a cryogenic calorimeter that can be used to measure the kinetic energy by measuring the temperature variation induced by the energy of the incident particle, with a typical resolution of 0.02% of TES detector can be achieved[1]. In this article, we designed a TES to measure the kinetic energy of fission fragments, and the signals of this TES with different incident particle positions, kinetic energy, and thermal conductivity were simulated using ANSYS. Therefore, we verified the feasibility of the TES and improved the count rate of the TES to 100cps.
Highlights
The fission yield data of neutron-induced nuclear fission is of considerable significance in quite a few aspects such as nuclear structure theory and the nuclear energy industry
In 2006-2012, several Transition-Edge Sensor (TES) calorimeters were made by NIST and LOSA to measure alpha particles, whose energy resolutions are on the order of 0.02% - 0.05%[5]
In section 4.1.2, we investigated the degree of dependence between the thermal equilibrium of the components and the location of the incident particles
Summary
The fission yield data of neutron-induced nuclear fission is of considerable significance in quite a few aspects such as nuclear structure theory and the nuclear energy industry. The yield data of neutron-induced fission in those nuclear databases has pretty high uncertainty, even conflict with each other in several energy regions. Ionization chambers and Au-Si surface barrier detectors are conventional kinetic-energy detectors, but the energy loss of the entrance window of the ionization chamber is difficult to calibrate, and the signal amplitude reduction of Au-Si surface barrier detectors is severe. They cannot meet the requirement of the TOF method. The TES calorimeter is an ultra-high energy resolution detector with increasing attention in recent decades. In 2006-2012, several TES calorimeters were made by NIST and LOSA to measure alpha particles, whose energy resolutions are on the order of 0.02% - 0.05%[5]
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