Application of the collective model to determine some vibrational bands of 140La nucleus

Tóm tắt

¹⁴⁰La is created from the thermal neutron capture reaction of ¹³⁹La, which is the product of the fission reaction. It makes some effects into the components of the nuclear reactor core. Understanding the properties and structure of ¹⁴⁰La is important in operating the nuclear reactor. Besides that, nuclear structure models are very effective in explaining the properties of nuclear structure. There are many nuclear structure models to solve those problems, such as Liquid Drop Model, Shell Model, Fermi Model, etc. Among them, the Collective Model has been very successful in describing the variety of nuclear properties, especially energy levels in deformed nuclei that the Shell Model and the Liquid Drop Model does not apply. This paper presents the application of the Collective Model to determine some vibrational bands of ¹⁴⁰La nucleus. This experiment is performed at channel No.2 of Dalat Research Reactor (DRR), Prompt gamma neutron activation analysis method (PGNAA) is used. The result has found 8 vibrational bands of ¹⁴⁰La nucleus.  It’s quite relevant to the theoretical calculation. The deviations are less than 1.6 %.