Feedback control method in nuclear-energy level life time measurement experiment

Abstract

The invention relates to a feedback control method in a nuclear-energy level life time measurement experiment. The feedback control method includes the following steps that (I), a target film and a stopping film adopted for the experiment are connected into a parallel-plate capacitor, and a graduated capacitance-distance database is established; (II), the distance between the two films is set as the distance D0 required by the experiment; (III), changes, caused by external disturbance, of capacitance are measured, current capacitance Cact is obtained, and the current actual distance Dact between the target film and the stopping film is calculated through a capacitance method; (IV), a deviation value delta D=D0-Dact between the actual distance Dact and the distance D0 required by the experiment is calculated, and the delta D is input into a controller; (V), if the delta D is larger than or equal to 0.1micron, the delta D does not meet a precision requirement, the deviation value is transmitted to a driver through the controller, a mobile platform bearing the target film and the stopping film is driven to move through the driver, so that the distance between the two films is backed to zero, and the method returns to the step (III); if the delta D meets the precision requirement, the controller issues a non-action command. The method can greatly improve precision and stability of a test system.

Description

technical field [0001] The invention belongs to the technical field of nuclear energy level lifetime measurement, and in particular relates to a feedback control method in an atomic nuclear energy level lifetime measurement experiment. Background technique [0002] The energy level lifetime of an atomic nucleus is an important physical quantity that characterizes the nuclear state, and it represents the transition probability between energy levels. The transition probability described by the theory is directly related to the wave function of the transition state and is therefore affected by the assumptions of the nuclear structure model. Therefore, measuring energy level lifetimes is the best test of theoretical models. The lifetime of high-spin states of atomic nuclei is generally in the range of 10 －13 ~10 －10 Between s is the suitable time measurement range for Doppler moving attenuation method (DSAM) and recoil distance method (RDM). Both methods exploit the Doppler ...

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Problems solved by technology

[0004] In the world, crystal oscillators are usually used to achieve closed-loop, but this closed-loop design is complex, and the bombardment of charged particles will cause a large voltage error, resulting in inaccurate distance measurement

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