Güneş Tanır

A new empirical formula for 14–15 MeV neutron-induced (n, p) reaction cross sections

In this study, we have suggested a new empirical formula to reproduce the cross sections of the (n, p) reactions at 14–15 MeV for the neutron incident energy. This formula obtained using the asymmetry parameters represents a modification to the original formula of Levkovskii. The resulting modified formulae yielded cross sections, representing smaller χ2 deviations from experimental values, and values much closer to unity as compared with those calculated using Levkovskiis original formula. The results obtained have been discussed and compared with the existing formulae, and found to be well in agreement, when used to correlate the available experimental σ(n, p) data of different nuclei.

Investigation of the pairing effect using newly evaluated empirical studies for 14–15 MeV neutron reaction cross sections

The asymmetry term effects for the cross sections of (n, charged particle) and (n,2n) reactions at 14-15 MeV neutron incident energy have been investigated. The effects of pairing and odd-even nucleon numbers in new data and in the formula of Tel et al. [J. Phys. G. 29, 2169 (2003)] are discussed. We have determined three different parameters groups by the classification of nuclei into even-even, even-odd, and odd-even (n,d) reactions. In addition, since there are not enough experimental data available, we have considered two different parameters groups by the classification of nuclei into odd-A and even-A (n,t) reaction cross sections. The empirical formulas with two parameters for the evaluation of the (n,d) and (n,t) reactions cross sections are discussed in the present study.

The Stopping Powers of Water and Lung for Protons in Radiotherapy

Aims: This study aims to calculate the energy losses in unit length of protons during their movement within water and lung by using two analytical equations. Study Design: One of the equations used in this study is the mass stopping power equation suggested by Bethe-Bloch (1930-1933) and modified by Tsoulfanidis (1995) and a new approach has been suggested in the other one. Methodology: The suggested new approach was obtained by substituting effective z*, Z* and I* values into the equation reported by Tsoulfanidis. Although the energy range of protons used in the radiotherapy is 75-250 MeV, in this study 0.001-250 MeV energy ranges were performed to identify the stopping power. In addition, a new empirical relation was given to simplify the expressions for stopping power. The results were compared with the other researcher’s results. Results: The suggested approach for the mass stopping power (Equation 2) can be used for both highand low energy protons. Stopping power values of protons should be especially useful in such medical fields as radiobiology, biomedical applications, radiotherapy and so on. Short Research Article Tanir et al.; JSRR, 6(4): 287-293, 2015; Article no.JSRR.2015.154 288

Comparison of two- and one-component preequilibrium exciton model calculations for some neutron induced reactions

Two-component preequilibrium, used by Gupta, and analogously one-component exciton model descriptions are applied to neutron induced reactions such as46Ti(n,n′),46Ti(n,xp) and27Al(n,xp) at 14.6 MeV. This is the first complete calculation made by the two-component approach of Gupta. In order to obtain mean lives the time-integrated form of master equations is used.

Elimination of bremsstrahlung in activation analysis by the deflection of β-particles in a magnetic field

The structureless “background” at X-ray and low energy γ-ray region, resulting from bremsstrahlung due to the stopping of β-radiations, causes serious problems in nuclear spectroscopy. In this study, in order to reduce the background and therefore to increase the sensitivity of the nuclear analytical technique and the number of elements observable, a methodology is developed to deflect the β-particles by a magnetic field. The experimental setup consists of a permanent magnet /≈1 kG/, Ge/Li/ solid-state detector, and multichannel analyzer.

Nötrino Kütlelerinin Deneysel Çözümlerinin İncelenmesi

Bu calismada, notrino-antinotrino kutlelerinin deneysel cozumlerindeki son calismalardan ornekler ozetlenmis ve tartisilmistir.