Heavy-ion Fusion Cross Sections of 32 S on 90,96 Zr Targets Using Coulomb and Proximity Potential

K. P. Santhosh and V. Bobby Jose

Abstract The fusion excitation functions for the fusion of 32S on 90,96Zr have been calculated larger value, while using one-dimensional barrier penetration model, taking scattering potential as the sum of Coulomb and proximity potential and the calculated values are compared with experimental data with considerations to shape degrees of freedom. At and above the barrier the computed cross sections match well with the experimental data, whereas below the barrier, calculations with nuclear surface tension coefficient improved by Reisdorf in the proximity potential with considerations to shape degrees of freedom give an approximate fit. Reduced reaction cross sections for the systems 32S on 90,96Zr have also been described.

DOI: https://doi.org/10.15415/jnp.2017.42029

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/825/4/42029_JNP_Santosh.pdf

The Dependence of Surface Diffuseness Parameter on N/Z Ratio of The Fusion of Neutron-Rich Colliding NucleiDepartment of Applied Sciences, Chitkara University, Solan – 164103 (H.P.), India.

SUMAN MITTAL AND ISHWAR DUTT*

Department of Applied Sciences, Chitkara University, Solan – 164103 (H.P.), India.

*Email: ishwar.dutt1@chitkarauniversity.edu.in

Abstract Surface diffuseness parameter used in Woods-Saxon form of potential have been extracted from a large number of experimentally studied neutron-rich fusion cross sections at near barrier energies. The results of our systematic study reveals that the extracted diffuseness parameter depend linearly on the N/Z ratio of the fusing nuclei. Further, we demonstrated that the extracted values of surface diffuseness parameter lies within the range a = 0.40 to 0.73 fm as compared to commonly accepted value form elastic scattering data i.e. 0.63 fm.

DOI: https://doi.org/10.15415/jnp.2017.42028

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/824/4/42028_JNP_Ishwar.pdf

Influence of Mo6+ on Dielectric properties of Copper Ferrites

B.V. RAO, P.V.L. NARAYANA AND A.D.P. RAO

Department of Nuclear Physics, Andhra University, Visakhapatnam, India.

Email: research.angalakuduru@yahoo.com

Abstract: Two series of copper ferrites are prepared using the chemical compositional formula Cu 1.0-3y Fe 2.0-2xMo x + yO4.0. They are calcinated at 750 C and sintered at 950C. When x =y = 0.0, the ε′ of the basic copper ferrite is probably due to electronic exchange interactions of copper and iron ions as Cu2+ ↔ Cu1+ and Fe3+ ↔ Fe2+. The observed value of dielectric constant (є′) decreases as a function of substituent concentration (x) up to x = 0.20 and for further values of ‘x’ it found to increase. In the case of ‘C’ (x = 0) series ferrites є′ decreases with substituent concentration (y) up to y = 0.04, later it found to increase. The dispersion of ac resistivity with frequency is observed indicating their strong dependence on frequency as in the case of dielectric behaviour. These results are explained with different possible mechanisms.
.

DOI: https://doi.org/10.15415/jnp.2017.42027

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/823/4/42027_JNP_Rao.pdf

Xps Study of the Oxidation State of Uranium Dioxide

J A LÓPEZ1*, C DÍAZ MORENO1 , J MURILLO2 AND L ECHEGOYEN2

1 Department of Physics, University of Texas at El Paso, El Paso, Texas 79968, U.S.A.

2 Department of Chemistry, University of Texas at El Paso, El Paso, Texas 79968, U.S.A.

*Email: jorgelopez@utep.edu

Abstract In this article we report an investigation of the oxidation state of uranium dioxide using X-Ray Photoelectron Spectroscopy, and by comparing to results obtained in previous studies. We find that uranium dioxide in powder appears to share its six valence electrons with the oxygen atoms to form crystalline UO3 .

DOI: https://doi.org/10.15415/jnp.2017.51022

LINK:http://dspace.chitkara.edu.in/jspui/bitstream/1/882/1/51022_JNP_L%C3%B3pez.pdf

Measurements of Neutrons In A Mixed GammaNeutron Field Using Three Different Types of Detectors

B LEAL1 , F. CASTILLO2†, J GUTIERREZ1 , JI GOLZARRI3 , I GAMBOADEBUEN1 , G. ESPINOSA3 H MARTÍNEZ2

1 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, 04510, Ciudad Universitaria, México D. F., México

2 Laboratorio de Espectroscopia, Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 48-3, 62251, Cuernavaca Morelos, México

3 Instituto de Física, Universidad Nacional Autónoma de México, Apartado Postal 20- 364, 01000, Ciudad de México, México

Abstract A linear electron accelerator for medical use is a device for the treatment of tumors by collimated beams of electrons and/or photons. These accelerators are devices that employ electromagnetic waves of high frequency, to accelerate electrons that are used directly in the treatment of superficial tumors, or, if they are made to hit them on an appropriate target, they can produce photons of high energy destined to the treatment of deeptumors.Depending on the energy of the electrons and photons and the materials that make up the head of the accelerator and the target, this equipment will produce in addition to the aforementioned radiation, neutron fields of regular intensity. It is necessary to estimate the equivalent dose due to the neutrons themselves, the doses due to the gamma field of neutron capture, produced by the capture of thermal neutrons in the concrete of the bunker, and the gamma doses due to phenomena of neutron activation of elements of the own accelerator. It is therefore important to be able to measure (detect, quantify, dose, etc.) both photons and neutrons in these cases and others more. In this work we use three different detectors, namely a scintillator-photomultiplier system, a fast reading dosimeter and bubble detector. The idea is to measure the radiation separately and compare their results. The results obtained were the mixed gamma-neutron field spectrum, the dose due only to neutrons obtained by the bubble detectors, which is compared to the dose obtained by the second fast reading dosimeters (model 884), plus the dose obtained by the first dosimeters (model 609) and finally the dose obtained by the Victoreen dosimeter.

DOI: https://doi.org/10.15415/jnp.2017.51021

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/881/1/51021_JNP_Castelo.pdf