Nükleer reaksiyonların astrofizik uygulamalarında hedef kalınlığına bağlı olarak etkin demet enerjisinin hesaplanması
Calculation of the effective beams energy depending on the target thickness in astrophysical applications of nuclear reactions
- Tez No: 167802
- Danışmanlar: Y.DOÇ.DR. TAYGUN GÜRAY
- Tez Türü: Yüksek Lisans
- Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
- Anahtar Kelimeler: Çekirdek sentezi, reaksiyon hıza, reaksiyon tesir kesiti, durdurma gücü, efektif enerji, astrofiriksel S-faktör
- Yıl: 2006
- Dil: Türkçe
- Üniversite: Kocaeli Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Fizik Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 55
Özet
NÜKLEER REAKSİYONLARIN ASTROFİZİK UYGULAMALARINDA HEDEF KALINLIĞINA BAĞLI OLARAK ETKİN DEMET ENERJİSİNİN HESAPLANMASI Seda Kutlu
Özet (Çeviri)
CALCULATION- OF THE EFFECTIVE BEAM ENERGY DEPENDING ON THE TARGET THICKNESS IN ASTROPHYSICAL APPLICATIONS OF NUCLEAR REACTIONS Seda Kutlu TCeywords: Nucleosyntihesis, reaction rate, reaction of cross section, stopping power, effective energy, astrophysical S-factor Abstract: The objective of this thesis is to define and calculate the effective energy depending on the target thickness in astrophysical applications of non-resonant nuclear reactions. The effective energy corresponds to a beam energy in the target at which one-half of the yield for the full target thickness is obtained. In this study, effective energy calculations have been applied to cross section results of some nuclear reaction measurements relevant to p-process. Although changes in many parameters depending on the target thickness are neglected, there is a decrease in the beam energy through the target. Since the cross section is a function of energy, it is very crucial to determine the most relevant beam energies corresponding to measured cross sections. Therefore, an average value approach in the beam energy is required for experiments in which thin targets are used. At sub-Coulomb energies the cross section drops steeply with decreasing beam energy, mainly because of the Coulomb barrier. The energy change of the beam in the target is defined with the stopping power, which is the ratio of the energy change to the quantity (dE/dx) of matter traversed by the particle. Stopping power is an energy dependent parameter, however, it is nearly constant over the small energy interval, in such a thin target approach. The objective of non-resonant reaction experiments in the field of nuclear astrophysics is to test the reliability of the statistical models. In this study, the beam effective energies have been calculated for the 106Cd(a,y)110Sn, 112Sn(a,y)116Te, and 63Cu(a,y)67Ga cross sections that had been measured, and the results have been compared with predictions of the statistical model code NON-SMOKER. After the corrections to the beam energies, it is observed that the experimental results get closer to the predicted results. m
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