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

Year 2018, Volume: 13 Issue: 2, 54 - 66, 30.11.2018

Hasan Özdoğan

https://doi.org/10.29233/sdufeffd.444816

Cited By: 3

Abstract

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

181Ta(α,xn) Reaksiyonu Tesir Kesitlerinin İncelenmesi

Abstract

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.

Keywords

Optiksel model, Seviye yoğunluğu, Tesir kesiti, TALYS 1.8

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