This paper presents the application of the Collective Model to determine some vibrational bands of 140La nucleus. This experiment is performed at channel 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 %. | TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH TẠP CHÍ KHOA HỌC HO CHI MINH CITY UNIVERSITY OF EDUCATION JOURNAL OF SCIENCE KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ NATURAL SCIENCES AND TECHNOLOGY ISSN: 1859-3100 Tập 14, Số 9 (2017): 59-66 Vol. 14, No. 9 (2017): 59-66 Email: tapchikhoahoc@; Website: APPLICATION OF THE COLLECTIVE MODEL TO DETERMINE SOME VIBRATIONAL BANDS OF 140LA NUCLEUS Nguyen An Son1*, Le Viet Huy1, Pham Ngoc Son2, Ho Huu Thang2 1 2 Dalat University Nuclear Research Institutes, Lamdong, Vietnam Received: 12/5/2017; Revised: 10/6/2017; Accepted: 23/9/2017 ABSTRACT 140 La 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 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 %. Keywords: Collective model, 140La, vibrational band. TÓM TẮT Ứng dụng mẫu hạt nhân suy rộng trong việc xác định một số phổ dao động của hạt nhân 140La 140 La được tạo ra từ phản ứng bắt neutron nhiệt của 139 La, sản phẩm của phản ứng phân hạch. Nó
