NOPR Collection: Special issue: Nuclear, Particle and Accelerator Physics

Cyclotrons: Past, present and future

Thu, 01 Aug 2019 00:00:00 GMT

Title: Cyclotrons: Past, present and future Authors: Pandit, V S Abstract: New design and developments in the field of cyclotrons have shown that cyclotrons can well be tailored to suit a large variety of applications in different fields. Today cyclotrons are providing variety of light and heavy ion beams with energy ranging from few MeV to several hundreds of MeV for scientific experiments as well as for medical and industrial applications. The development of a 250 - 400 MeV/A cyclotron with proton and carbon beams has brought this advanced technique into hospitals for cancer therapy. Several proposals to generate about 10 MW of beam power using cyclotrons for energy generation or transmutation of nuclear waste are under active considerations. A brief summary of the cyclotron principle and an overview of different types of cyclotrons have been presented. Page(s): 519-526

Effective surface properties of Sn isotopes

Thu, 01 Aug 2019 00:00:00 GMT

Title: Effective surface properties of Sn isotopes Authors: Quddus, Abdul; Patra, S K Abstract: We have studied the effective surface properties such as symmetry energy coefficient, pressure, and curvature coefficient of Sn isotopic series within the effective field theory motivated relativistic meanfield formalism (E-RMF)¹. The densities of the nuclei, calculated within E-RMF, are used as the inputs to the coherent density fluctuation model (CDFM)². We have used the recently predicted force parameter IOPB-I¹ and compared the results with the calculated values of widely accepted and well-known NL3 parameter set³. The small kinks, observed in the graph correspond to the magic numberin the isotopic series. Page(s): 527-530

On the fate of quarkonia in quark gluon plasma medium within a Quasi-particle model

Thu, 01 Aug 2019 00:00:00 GMT

Title: On the fate of quarkonia in quark gluon plasma medium within a Quasi-particle model Authors: Agotiya, Vineet Kumar; Nilima, Indrani Abstract: We work on equations of state for hot QCD obtained from a hard thermal loop expression for the gluon self-energy, by employing the quasi-parton equilibrium distribution functions. The method involves mapping the interaction part of the equation of state to an effective fugacity of otherwise non-interacting quasi-gluons. Using the quasi-gluon distribution function, we have studied the dissociation of heavy Quarkonium in hot QCD medium by investigating the medium modification to a heavy quark potential. Employing the in-medium (corrected) potential while considering the anisotropy (both oblate and prolate cases) in the medium, the thermal widths and the binding energies of the heavy quarkonia states (s-wave charmonia and s-wave bottomonia specifically, for radial quantum numbers n=1 and 2) have been determined. In the present article, we shall consider an anisotropic QGP medium which is described in terms of quasi-particle degree of freedom based on a recent proposed quasi-particle model for hot QCD equation of state. The presence of anisotropy makes the real-part of the potential stronger but the imaginary-part is weakened slightly. However, since the medium corrections to the imaginary-part is a small perturbation to the vacuum part, overall the anisotropy makes the dissociation temperatures higher, compared to isotropic medium. Page(s): 531-535

Investigation of nucleon–nucleon interaction with confined one gluon exchange potential and one pion exchange potential

Thu, 01 Aug 2019 00:00:00 GMT

Title: Investigation of nucleon–nucleon interaction with confined one gluon exchange potential and one pion exchange potential Authors: Nilakanthan, V K; Vanamali, C S; Raghavendra, S; Kumar, K B Vijaya Abstract: The nucleon-nucleon (N-N) interaction in the singlet (¹S₀) and triplet (³S₁) channels have been studied in the framework of relativistic harmonic model (RHM) using the resonating group method (RGM) in born-oppenheimer approximation. The full hamiltonian consists of the kinetic energy, two body confinement potential, confined one gluon exchange potential (COGEP) and one pion exchange potential (OPEP). Contribution of COGEP and OPEP to the adiabatic N-N interaction potential has been discussed. The presence of short range repulsion for the N-N interaction has also been investigated and the reason for the same has been attributed to the presence of color magnetic terms in the COGEP. Page(s): 536-539