Journal of Nuclear Physics, Material Sciences, Radiation and Applications
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Radionuclide Determination In Surface Water Samples By Inductively Coupled Plasma With Sector Field Mass Spectrometry (ICP-SFMS)
Get PDFThe determination of naturally occurring radionuclides in the environment by inductively coupled plasma mass spectrometry of high resolution (ICP-SFMS) has gained recognition over the last fifteen years, relative to the radiometric techniques, as the result of improvement in instrumental performance, sample introduction equipment and sample preparation. With the increase in instrumental sensitivity, it is now possible to measure ultratrace levels of many radioisotopes.The aim of this work was to determined the natural radionuclides (232Th, 234U, 235U and 238U) in surface water using Inductively Coupled Plasma-Sector Field Mass Spectrometry (ICP-SFMS). The samples were sampling from Lerma river, State of Mexico at february to april 2015. The process of treatment of sample consisted in perform an acid digestion according to the 3015A USEPA method followed of the direct measurement in ICP-SFMS. Results obtained were: a) identify the presence of 232Th, 234U, 235U and 238U isotopes in water, b) isotopic ratios were for 234U/238U=1.133 ± 0.016. ICP-SFMS has gained popularity in the field of radiochemistry, particularly as a method of detection for long lived-actinides
Studies on Neutron, Photon (Bremsstrahlung) and Proton Induced Fission of Actinides and Pre-Actinides
Get PDFWe present the yields of various fission products determined in the reactor neutron, 3.7-18.1 MeV quasi-mono energetic neutron, 8-80 MeV bremsstrahlung and 20-45 MeV proton induced fission of 232Th and 238u using radiochemical and off-line beta or gamma ray counting. The yields of the fission products in the bremsstrahlung induced fission natPb and 209Bi with 50-70 MeV and 2.5 GeV based on off-line gamma ray spectrometric technique were also presented. From the yields of fission products, the mass chains yields were obtained using charge distribution correction. From the mass yield distribution, the peak-to-valley (P/V) ratio was obtained. The role of excitation energy on the peak-to-valley ratio and fine structure such as effect of shell closure proximity and even-odd effect of mass yield distribution were examined. The higher yields of the fission products around A=133-134, 138-140 and 143-144 and their complementary products explained from the nuclear structure effect and role of standard I and II mode of asymmetric fission. In the neutron, photon (bremsstrahlung) and proton induced fission, the asymmetric mass distribution for actinides (Th, u) and symmetric distribution for pre-actinides (Pb, Bi) were explained from different type of potential fission barrier
Electrochemical Characterization of Cathodized Copper Oxide Thin Films
Get PDFCathodic electrodeposited copper oxide thin films were prepared using 0.1 M aqueous (distilled water) copper sulfate solution onto the surface of stainless steel substrates. Deposited samples were characterized by structural and morphological analysis using XRD and SeM. Prepared samples were also analyzed using cyclic voltammetry, charge-discharge, and impedance spectroscopy. electrode shows nearly rectangular capacitive behavior. The highest specific capacitance of 62 F/gm was calculated at a scan rate of 1 mV/sec in 1M Na2SO4 electrolyte. The internal resistance observed from the Nyquist plot which is about 1.95 Ω. Using the ZsimpWin software matched equivalent circuit and circuitry parameters were reported
Development of Silicon Sensor Characterization System for Future High Energy Physics Experiments
Get PDFThe Compact Muon Solenoid (CMS) is one of the general purpose experiments at the Large Hadron Collider (LHC), CeRN and has its tracker built of all silicon strip and pixel sensors. Si sensors are expected to play extremely important role in the upgrades of the existing tracker for future high luminosity environment and will also be used in future lepton colliders. however, properties of the silicon sensors have to be carefully understood before they can be put in the extremely high luminosity condition. At Delhi university (DU), we have been working on the development of Si sensor characterization system, as part of the collaboration with the CMS experiment and RD50 collaboration. this works reports the installation of current-voltage (I-V) and capacitance-voltage (C-V) systems at DU
Fusion Nuclear Data activities at FNL, IPR
Get PDFThis paper briefly describes the current fusion nuclear data activities at Fusion Neutronics Laboratory, Institute for Plasma Research. It consist of infrastructure development for the cross-section measurements of structural materials with an accelerator based 14 MeV neutron generator and theoretical study of the cross-section using advanced nuclear reaction modular codes EMPIRE and TALYS. It will also cover the proposed surrogate experiment to measure 55Fe (n, p) 55Mn using BARC-TIFR Pelletron facility at Mumbai
Forward-Backward Multiplicity Correlations in Relativistic Heavy-Ion Collisions
Get PDFForward-backward multiplicitycorrelations are investigated by analyzing the experimental data on 6O-AgBr collisions at 14.5A, 60A and 200A GeV/c and the findings are compared with the predictions of Monte Carlo model, hIJING. the findings indicate that the observed correlations are mainly of short-range in nature which arise due to the decay of clusters and (or) resonances produced in the central rapidity region. the result reveal that the range of F-B correlations extend to rather longer range with increasing beam energy which might be due to overall multiplicity fluctuations arising because of nuclear geometry. however, there is no evidence for the presence of long-range correlations even at the highest beam energy considered
Gamma Photon Exposure Buildup Factors for Some Spin Ice Compounds Using G-P Fitting Method
Get PDFExposure buildup factors(EBF) for some spin ice compounds such as Dysprosium Titanate (Dy2Ti2O7), Dysprosium Stannate (Dy2Sn2O7), holmium Titanate (Ho2Ti2O7) and holmium Stannate (Ho2Ti2O7) useful in nuclear engineering have been computed for photon energy range 0.015 to 15 MeV upto penetration depth of 40 mean free path. The eBF for these compounds were found to be the largest at photon energy 15 MeV excepts in low energy. The eBF for the compounds containing tin were found to be the largest as well as shown a peak at 30 keV photon energy
Influence of Incomplete Fusion Reaction on Complete Fusion Below 10 Mev/ Nucleon Energies
Get PDFAn attempt has been made in the present work to provide an ample opportunity to explore the information about the influence of incomplete fusion (ICF) reaction dynamics on complete fusion in heavy ion induced nuclear reactions. excitation functions for several evaporation residues produced in the interaction of projectile 16O with target 175lu have been measured over the wide projectile energy range ≈ 70-100 MeV. the recoil-catcher activation technique followed by the offline γ-ray spectroscopy has been used for the present measurements. In case of precursor decay, we have made use of Cavinato et al. formulation to calculate the independent cross-section of the identified residues. the measured efs are compared with theoretical predictions of statistical model code PACE-2 and any enhancement in the measured cross-section from theoretical prediction may be due to ICF reaction process. An attempt has been made to estimate the ICf contribution of the cross-section from the measured excitation function data and the dependence of ICf cross-section on projectile energy
Senstivity study using globes
No full textNeutrino oscillation occurs if neutrinos have masses and if they mix among each other. this phenomenon would be in close analogy to the experimentally observed mixing in quark sector. Neutrino oscillations are therefore very interesting in the context of elementary particle physics. Neutrino oscillation in matter is probably the reason for the observed deficit of solar neutrino flux .the search for neutrino oscillation is the only way to investigate even for very small difference of neutrino masses. the evidence of small but non vanishing neutrino masses represent one of the few clear indications of the physics beyond standard model. the findings of nonzero neutrino masses by Super-kamiokande in 1998 triggered a huge interest of experimentalists in neutrino physics.In the present article after discussing the theoretical background concerning massive neutrinos and their status in standard model, latest important long baseline experiments dealing with neutrino oscillations have been discussed. It has been tried to show the important link between the physics behind neutrino oscillation and the software used (GloBES)
Effect of the Critical Angular Momentum on Incomplete Fusion Dynamics
Get PDFAn attempt has been made to calculate the critical angular momentum (ℓcrit) from the experimentally measured total ER cross-sections and are compared with Bass model predictions (using PACE-2). A comparison between experimentally measured and theoretically calculated critical angular momentum for the systems 16O + 45Sc and 16O + 74ge has been done. In case of 16O + 45Sc system, it is found that the experimentally measured ℓcrit values are slightly lower than the theoretically calculated values at projectile energies from 66 to 114 MeV. the low values of ℓcrit associated with ICf-channels for this system suggests that at these projectile energies, ICf may not be strictly associated with peripheral collision. Instead there appears to be deeper penetration of the projectile with the target at these beam energies. But for the system 16O +74ge at projectile energies from 65 to 112 MeV, the experimentally measured ℓcrit-values are consistent with theoretically calculated values. this shows that ℓcrit -values associated with ICf channels for this system suggests that at these projectile energies, ICf may be associated with peripheral collision