Abstract
238U material is component in fuels of nuclear reactor core. Understanding properties and structure of 238U nucleus is necessary before simulating and designing nuclear reactor. Besides that, the study of nuclear reaction is necessary to identify the specific characteristics of nucleus, it is the most effective experimental method up to now. However, in order to explain the properties of nuclear structure, in addition to study of the nuclear reaction, nuclear structure models and its theory must be used. There are many nuclear structure models to solve those properties of nucleus. This paper presents application of the Collective Model to determine some rotational bands of 239U nucleus, using Prompt gamma neutron activation analysis method (PGNAA). Experiment is performed at channel No.2 of Dalat Research Reactor (DRR), using Filtered Thermal Neutron Beam and Compton Suppression Spectroscopy with High – Purity Germanium detector (HPGe). The results have found 11 rotational bands of 239U nucleus. This work is very necessary for the research of nuclear structure which controls material technology by itself.
Highlights
Collective Model was developed in the 1950s by Reynolds, A
There are 36 prompt gamma-rays emitted from 238U (n, ) 239U reaction
Determination of rotational bands of 239U is calculated by Equation (5) and (6)
Summary
Collective Model was developed in the 1950s by Reynolds, A. The spherical symmetric potential of the nucleus with full shell is exceptionally stable to the effects of additional nucleons The Collective Model has been very successful in describing variety of nuclear properties, especially energy levels in nuclei that the Shell Model and the Liquid Drop Model cannot be applied. These energy levels show the characteristics of rotating or vibrating systems. 239U is heavy even-odd nucleus which has 92 protons, 146 neutrons and 1 added neutron In this experiment, PGNAA method is used to acquire the prompt gamma-rays emitted from 238U (n, ) 239U reaction. Where n is incident neutron, 238U is the target nucleus, (239U)* is compound nucleus, (239U) is product nucleus and prompt is prompt gamma-rays
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