Monday 28 September 2015

Study of Excitation Functions of (p, n) Reactions for 56Fe and 57Fe Target from Threshold to 30 MeV

Damewan Suchiang1 and B. M. Jyrwa 2

1 Department of Physics, Tura Government College, Tura 794001, Meghalaya, India
2 Department of Physics, North Eastern Hill University, Shillong 793022, Meghalaya, India
*Email : bjyrwa@gmail.com

The Author(s) 2015. This article is published with open access at www.chitkara.edu.in/publications

Abstract: The theoretical calculation of the cross section for formation of 56,57Co in (p, n) reaction from 56,57Fe target have been study from reaction threshold to 30 MeV using TALYS-1.4 nuclear model reaction code whereby we have studied major nuclear reaction mechanisms, including direct, pre-equilibrium and compound nuclear reactions. These calculations were carried out by adjusting the effective imaginary potential, level density and shell damping parameters. It is observed that an excellent agreement between the theoretical calculated and experimental data is obtained with minimal effort on parameter fitting. We have also observed that there is significant contribution of pre-equilibrium emission in (p, n) reaction cross-section of 56Fe and 57Fe. The systematic increase in (p, n) cross-sections with increasing neutron number in reactions induced by protons on 56Fe and 57Fe is explained in terms of compound and pre-equilibrium mode.

Keywords: Iron target; Level density; shell correction; pairing interaction; Excitation function; Pre-equilibrium.

Nuclei Near and Far From β-Stability Line

R.L. Nayak, T. Sahoo and A. Acharya*
Department of physics, VSS University of Technology, Burla, Orissa, India
*Email: aacharya@iopb.res.in

This article is published with open access at www.chitkara.edu.in/publications

Abstract: Proton to neutron ratio around β-stability line presents an open challenge to the nuclear physicists. The prominent milestone in this regard is the discovery of the super heavy elements, nuclear halos in the lightest neutron-rich nuclei, experimental mapping of the nuclear shell structure near and far from stability. In this present paper, the behavior of the p- and n- halo nuclei near the β-stability line are discussed considering the variation of radius with respect to the mass number and N~Z for different nuclei. Our aim is to study the nuclear properties through neutron and proton skin. The isospin symmetry breaking is for heavy halo nuclei of strong interest.
Keywords: Neutron and proton drip line nuclei; β stability line; n- and p- skin

Effect of Laser Radiation on Biomolecules

  E. Prieto Institute of Physical Sciences-UNAM, Avenida University 1001, Chamilpa, Cu...