Trần Viết Nhân Hào * , Đỗ Quang Tâm , Nguyễn Cao Bảo Duy Đặng Phước Đức

* Người chịu trách nhiệm về bài viết: (tvnhao@hueuni.edu.vn)

Abstract

In this study, we evaluate the role of second-order potential in the microscopic optical potential model for elastic neutron scattering off double-magic targets. We employed the self-consistent mean-field method, applied to the microscopic optical potential model, to evaluate the second-order absorption potential for light, medium, and heavy nuclei, such as 16O, 40Ca, 48Ca, and 208Pb. The computational results show that for the light nucleus 16O, the second-order potential exists in the energy range of 9–22 MeV. For the medium nucleus 40Ca, the second-order potential appears when the incident neutron energy exceeds 20 MeV. In the case of 48Ca, the second-order potential exists even at low energies. For the heavy nucleus 208Pb, the second-order potential has a minor effect. From the obtained results, we conclude that the magnitude of the second-order potential increases with the incident neutron energy and depends on the target nucleus.
Keywords: Microscopic optical potential, Second-order potential, Self-consistent mean-field

Tóm tắt

Trong nghiên cứu này chúng tôi đánh giá vai trò của thế bậc hai trong mô hình thế quang học vi mô cho tán xạ đàn hồi neutron lên các bia hạt nhân. Cụ thể, chúng tôi sử dụng phương pháp trường trung bình tự hợp áp dụng lên mô hình thế quang học vi mô để đánh giá thế hấp thụ bậc hai cho các hạt nhân có số khối từ nhẹ, trung bình đến nặng như 16O, 40Ca, 48Ca và 208Pb. Kết quả tính toán cho thấy đối với hạt nhân nhẹ 16O, thế bậc hai tồn tại ở dải năng lượng từ 9 - 22 MeV. Đối với hạt nhân 40Ca, thế bậc hai xuất hiện khi năng lượng neutron tới lớn hơn 20 MeV. Thế bậc hai ở hạt nhân 48Ca xuất hiện ngay ở năng lượng thấp. Đối với hạt nhân nặng 208Pb, thế bậc hai có hiệu ứng nhỏ. Từ đó kết luận rằng, độ lớn của thế bậc hai tăng theo năng lượng hạt neutron tới và phụ thuộc vào hạt nhân bia.
Từ khóa: Thế quang học vi mô, Thế bậc hai, Trường trung bình tự hợp

Article Details

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