181Ta(α,xn) Reaksiyonu Tesir Kesitlerinin İncelenmesi

Optiksel model, nükleer reaksiyonları açıklamak için geliştirilen modellerden birisidir. Soğurma etkilerinin var olması halinde elastik saçılmayı genel bir yolla inceleyebilmemizi sağlar. Optiksel model potansiyeli; bileşik ve denge-öncesi nükleer reaksiyonların tesir kesitlerinin açılan reaksiyon kanallarına nasıl dağılacağını belirlediğinden dolayı, nükleeer reaksiyonlar için oldukça önemlidir. Optiksel model potansiyeli ile birlikte; seviye yoğunluğu bilgisi, tesir kesiti, enerji spektrumu ve diğer gözlenebilir nükleer reaksiyon değerlerinin güvenilir teorik analizi için belki de en önemli bileşendir. Bu çalışmada, 181Ta(α,n)184Re, 181Ta(α,2n)183Re, 181Ta(α,3n)182Re ve 181Ta(α,4n)181Re reaksiyon tesir kesitleri farklı seviye yoğunluğu ve optiksel modeller kullanılarak hesaplanmıştır. Hesaplamalarda optiksel modeller için, Watanabe düzeltmeli Koning-Delaroche, McFadden- Satchler, Demetriou-Grama-Goriely ve Avrigeanu modelleri, seviye yoğunluğu modelleri için Sabit Sıcaklık Fermi Gaz, Geri Kaydırmalı Fermi Gaz ve Genelleştirilmiş Süper Akışkan modelleri kullanılmıştır. Tüm hesaplamalar TALYS 1.8 kodu ile gerçekleştirilmiştir. Elde edilen sonuçlar Uluslararası Deneysel Nükleer Reaksiyon Data Merkezi (EXFOR)’dan alınan verilerle karşılaştırılmıştır. Hesaplamaların deneysel verilerle karşılaştırılmasında göreli varyans analizi kullanılmıştır.

Anahtar Kelimeler:

Optiksel model, Seviye yoğunluğu, Tesir kesiti, TALYS 1.8

Investigation cross sections of 181Ta(α,xn) reaction

Optical model is one of the models developed to explain nuclear reactions. It allows us to investigate the elastic scattering in the presence of absorption effects. The optical model is very important for nuclear reactions, since it defines how the cross sections of compound and the pre-equilibrium nuclear reactions separated to the opened reaction channels. Level density information along with the optical model potential perhaps the most important component for reliable theoretical analysis of the cross section, energy spectrum and other observable nuclear reaction values. In this study, cross section calculations have been done for 181Ta(α,n)184Re, 181Ta(α,2n)183Re, 181Ta(α,3n)182Re ve 181Ta(α,4n)181Re reactions by using different level densities and optical models. In the calculations Watanabe corrected Koning-Delaroche, McFadden- Satchler, Demetriou-Grama-Goriely and Avrigeanu models have been used for optical models while Constant Temperature Fermi Gas, Back-Shifted Fermi Gas and Generalised Superfluid models have been selected for level density models. All calculations have been performed with TALYS 1.8 code. Obtained results have been compared with the data taken from International Experimental Nuclear Reaction Data Center (EXFOR). Relative analysis of variance was used in the comparison of the calculations with the experimental data.

Keywords:

Optical model, Level density, Cross section, TALYS 1.8,

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