Browsing by Author "N. Marimuthu"

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Analysis of Various Projectile Interactions with Nuclear Emulsion Detector Nuclei at 1 GeV per Nucleon Using Coulomb Modified Glauber Model
(Hindawi Limited, 2017) N. Marimuthu; V. Singh; S.S.R. Inbanathan
The total nuclear reaction cross section is calculated considering the cases with and without medium effect by employing Coulomb modified Glauber model (CMGM) for interactions of projectiles 56Fe26, 84Kr36, 132Xe54, 197Au79, and 238U92 with nuclear emulsion detector (NED) nuclei at around 1 GeV per nucleon incident kinetic energy. These calculated nuclear reaction cross sections are correlated with the different target groups of the NED nuclei. The average value of various parameters is also calculated and compared with the corresponding experimental results. The number of shower particles emitted in an interaction is also calculated and showed good agreement with the experimental result. We observed that the total nuclear reaction cross section increases with increasing the target mass number in case of all the considered projectiles. In addition, it is shown that the average value of reaction cross section with nuclear medium effect is in good agreement with the experimental results for projectiles 56Fe, 84Kr, and 132Xe, although results of projectiles 197Au and 238U are not in agreement with the experimental observations. This study sheds some light on the energy dependence of the nuclear reaction cross section. © 2017 N. Marimuthu et al.
Characteristic study and development of a surface resistivity measuring device for the Resistive Plate Chamber detector
(Institute of Physics Publishing, 2019) A. Kumar; A. Pandey; N. Marimuthu; M.K. Singh; V. Singh; S.S.R. Inbanathan
The India-based Neutrino Observatory (INO) is an approved multi-institutional experiment of India. It will use maximum 30,000 Resistive Plate Chamber (RPC) of size 2 m × 2 m as an active detector in which each will be sandwiched between two iron plates. Each RPC detectors will be made up of 3 mm thick glass (or Bakelite) plates whose one surface will be coated with graphite paint to work as electrode. To achieve effective and uniform electric field, the coated graphite paint must have uniform distribution over the glass surface. Uniformity can be demonstrated by measuring the surface resistance of the coated graphite paint. However, manual measurement of 60,000 electrodes with the help of multimeter and the jig demands huge amount of person-hour with compromised accuracy, and therefore that requires the need and importance of the automatic scanning system. We have designed an advanced automatic scanning system (ASS) has been developed to fulfill the required needs and overcome the shortcomings of the initially developed system. Measurements are sensitive to the contact pressure between the jig and RPC electrode surface. In this paper, various parameters of the ASS have been precisely fixed. Obtained results are compared with the standard one and found satisfactory within error. It is observed that for obtaining the correct and safe value of surface resistance, applied pressure value in terms of force should be in the range of (9-11) Newton. © 2019 IOP Publishing Ltd and Sissa Medialab.
Characteristics study of projectile’s lightest fragment for 84Kr36–emulsion interaction at around 1 A GeV
(Scientific Publishers, 2017) N. Marimuthu; V. Singh; S.S.R. Inbanathan
In this article, we present the results of our investigations on the projectile’s lightest fragment (proton) multiplicity and probability distributions with 84Kr36 emulsion collision at around 1 A GeV. The multiplicity and normalized multiplicity of projectile’s lightest fragment (proton) are correlated with the compound particles, shower particles, black particles, grey particles; alpha (helium nucleus) fragments and heavily ionizing charged particles. It is found that projectile’s lightest fragment (proton) is strongly correlated with compound particles and shower particles rather than other particles and the average multiplicity of projectile’s lightest fragment (proton) increases with increasing compound, shower and heavily ionizing charge particles. Normalized projectile’s lightest fragment (proton) is strongly correlated with compound particles, shower particles and heavily ionizing charge particles. The multiplicity distribution of the projectile’s lightest fragment (proton) emitted in the 84Kr36 + emulsion interaction at around 1 A GeV with different target has been well explained by KNO scaling. The mean multiplicity of projectile’s lightest fragments (proton) depends on the mass number of the projectile and does not significantly dependent of the projectile energy. The mean multiplicity of projectile’s lightest fragment (proton) increases with increasing the target mass number. © 2016, Indian Association for the Cultivation of Science.
Charged pion production in the - 8436Kr emulsion interactions at around 1 A Gev
(American Institute of Physics Inc., 2019) N. Marimuthu; V. Singh; S.S.R. Inbanathan
Relativistic nucleus-nucleus and hadrons-nucleus collisions are very useful to understand the particle production mechanism. The present work is devoted to the investigation on emitted charged pion (Nπ) from 8436Kr - Emulsion interactions at around 1 A Gev. We have calculated the total number of wounded nucleons (W) and total number of interactions (ν) using wounded nucleon model. The obtained results revealed that the estimated number of wounded nucleons and the total number of interactions are increases with increasing mass number of the target nucleus. We have also observed that the mean multiplicity of relativistic charged particles is strongly dependent on the total number of wounded nucleons and the total number of interactions. © 2019 Author(s).
Coulomb Modified Glauber Model Analysis for Interaction of 56Fe26, 84Kr36, 132Xe54, 197Au79 and 238U92 Projectiles
(Springer Science and Business Media, LLC, 2018) N. Marimuthu; V. Singh; S.S.R. Inbanathan
In this work, the total reaction cross section considering with (without) nuclear medium effect within the Coulomb Modified Glauber Model (CMGM) is calculated. The projectiles (formula presented), (formula presented), (formula presented), (formula presented) and (formula presented) interacts with nuclear emulsion having kinetic energy (KE) (formula presented). The total reaction cross section is compared with the corresponding experimental value. © 2018, Springer International Publishing AG, part of Springer Nature.
Measurement of characteristic impedance of silicon fiber sheet based readout strip panel for RPC detector in INO
(Institute of Physics Publishing, 2017) M.K. Singh; A. Kumar; N. Marimuthu; V. Singh; V.S. Subrahmanyam
The India-based Neutrino Observatory (INO) is a mega science project of India, which is going to use about 30,000 Resistive Plate Chambers (RPC) as active detector elements for the study of atmoshpheric neutrino oscillations. Each RPC detector will consist of two orthogonally placed readout strip panel for picking the signals generated in the gas chamber. The area of RPC detector in INO-ICAL (Iron Calorimeter) experiment will be 2 m × 2 m, therefore the dimensions of readout strip panel should also be 2 m × 2 m. To get undistorted signals pass through the readout strip panel to front-end electronics, their characteristic impedance should be matched with each other. In the present paper, we describe the need and search of new dielectric material for the fabrication of flame resistant, waterproof and flexible readout strip panel. We will also describe the measurement of characteristic impedance of Plastic Honeycomb (PH) based readout strip panel and Silicon Fiber Sheet (SFS) based readout strip panel in a comparative way, and its variation under loading and with time. Based on this study, we found that a 5 mm thick SFS-based readout strip panel has a minimum signal reflection at 49.5 ohm characteristic impedance value. Our study shows that SFS is a good dielectric material for the purpose. © 2017 IOP Publishing Ltd and Sissa Medialab srl.
Study of relativistic charged particles production in 84Kr36 emulsion interactions ∼1 GeV per nucleon with wounded nucleon model
(World Scientific Publishing Co. Pte Ltd, 2019) N. Marimuthu; R. Prajapati; M.K. Singh; V. Singh; S.S.R. Inbanathan
The experimental results on the multiplicity and probability distribution of the emitted charged pions (Nπ) in the interactions of 84Kr36 projectile at around 1GeV per nucleon with nuclear emulsion targets are reported. In this work, we have employed a wounded nucleon model (WNM) to calculate the total number of wounded nucleons (W) and the total number of interactions (ν). The dependence of average multiplicities of produced relativistic charged particles on the calculated wounded nucleons and total interactions are investigated. The obtained results revealed that the average multiplicity of (Nπ) is dependent on the projectile and target mass number. The calculated values of the total number of wounded nucleons and the total numbers of interactions show a strong dependence on the mass of the colliding nuclei. The emission rate of the mean multiplicity of (Ns) and (Nπ) linearly increases with increasing the total number of wounded nucleons and interactions. © 2019 World Scientific Publishing Company.