Dr. Sridhar K N
@gfgc.kar.nic.in
Asst. Professor, Dept. of Physics
Govt. First Grade College, Kolar, Karnataka, India
RESEARCH INTERESTS
Nuclear Physics, nano materials.
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Reddi Rani L, N. Sowmya, H.C. Manjunatha, and K.N. Sridhar
Elsevier BV
B.M. Chandrika, M.R. Ambika, L. Seenappa, H.C. Manjunatha, K.N. Sridhar, A.J. Clement Lourduraj, and Sherry Shajan Kuttukaran
Elsevier BV
R. Umashankara Raja, Y.S. Vidya, H.C. Manjunatha, R. Munirathnam, K.N. Sridhar, K.M. Rajashekara, S. Manjunatha, and L. Seenappa
Elsevier BV
R. Soundar, H.C. Manjunatha, Y.S. Vidya, R. Munirathnam, K.N. Sasidhar, L. Seenappa, K.N. Sridhar, S. Manjunatha, and E. Krishnakanth
Elsevier BV
Y. S. Vidya, H. C. Manjunatha, Balaji Rao Ravuri, S. Manjunatha, and K. N. Sridhar
Springer Science and Business Media LLC
Umashankar raja. R, H.C. Manjunatha, Y.S. Vidya, L. Seenappa, Krishnakanth E., K.N. Sridhar, and R. Munirathnam
Elsevier BV
R. Umashankar raja, H.C. Manjunatha, Y.S. Vidya, L. Seenappa, Krishnakanth E., K.N. Sridhar, and R. Munirathnam
Elsevier BV
N. Sowmya, H. C. Manjunatha, K. N. Sridhar, P. S. Damodara Gupta, and Krishnakanth Erappa
Springer Science and Business Media LLC
N. Sasidhar, Y.S. Vidya, H.C. Manjunatha, R. Soundar, R. Munirathnam, L. Seenappa, K.N. Sridhar, S. Manjunatha, and E. Krishnakanth
Elsevier BV
R. Munirathnam, Y.S. Vidya, H.C. Manjunatha, L. Seenappa, K.N. Sridhar, S. Manjunatha, M. Shivanna, S. Veera Rethina Murugan, B. Sadashivamurthy, Suman Kumar,et al.
Elsevier BV
B.M. Chandrika, Holaly Chandrashekara Shastry Manjunatha, R. Munirathnam, K.N. Sridhar, L. Seenappa, S. Manjunatha, A.J. Clement Lourduraj, and P.S. Damodara Gupta
Elsevier BV
R. Soundar, H.C. Manjunatha, Y.S. Vidya, S. Deepthi, R. Munirathnam, N. Sasidhar, L. Seenappa, K.N. Sridhar, S. Manjunatha, and E. Krishnakanth
Elsevier BV
Reddi Rani. L, N. Sowmya, K. N Sridhar, H C. Manjunatha, and M. M. Armstrong Arasu
IOP Publishing
Abstract A new empirical formula for the astrophysical S-factor has been suggested as a function of the Coulomb interaction parameter, center of mass energy, and barrier height. About 22 fusion reactions with 40,48Ca as projectiles were considered for different targets, leading to compound nuclei with atomic and mass numbers varying between 40 112 and , respectively. The fusion cross-sections have been estimated using the geometric factor, the Gamow-Sommerfield factor, and the empirical formula for the S-factor. This study's findings showed better agreement with those of available experiments when compared to Wong's formula. The present work leads to a smaller standard deviation value than Wong's formula when used to correlate the experimental data of calcium-induced fusion reactions. Wong's formula provides a good approximation of fusion cross-sections when the center of mass energy is below the fusion barrier when compared to above the fusion barrier.
Reddi Rani L., N. Sowmya, H. C. Manjunatha, K. N. Sridhar, and M. M. Armstrong Arasu
American Physical Society (APS)
H. C. Manjunatha, K. N. Sridhar, N. Sowmya, A. V. Mahesh Babu, and H. S. Anushree
World Scientific Pub Co Pte Ltd
The isotopic yield and half-lives of the spontaneous fission of superheavy nuclei [Formula: see text] and [Formula: see text] are studied. First, the theoretical formalism is validated by applying it to known isotopes of superheavy nuclei which can undergo spontaneous fission. Half-lives obtained from this work indicate that all the half-lives are approximately twice when compared to experimental measurements. Thereafter, we explored the isotopic yield and half-lives of spontaneous fission for the superheavy nuclei [Formula: see text] and [Formula: see text] by studying the driving potential, yield and penetration probability. The superheavy nuclei [Formula: see text] can undergo alpha decay up to [Formula: see text]. Thereafter they undergo spontaneous fission. Similarly, the superheavy nuclei [Formula: see text] undergo spontaneous fission beyond A=309. It is observed that the superheavy nuclei [Formula: see text] undergo spontaneous fission through the fission fragment combination of Sn+Tm, however, the superheavy nuclei [Formula: see text] undergo spontaneous fission with the fragments Sn+Yb. The larger spontaneous half-life is of the order of ns from the superheavy nuclei [Formula: see text]119 and [Formula: see text]120. Further investigations were required in the evaluation of the anticipated fission fragment combinations and half-lives of [Formula: see text]119 and [Formula: see text]120.
B. Chinnappa Reddy, Y.S. Vidya, H.C. Manjunatha, S. Manjunatha, K.N. Sridhar, R. Munirathnam, and L. Seenappa
Elsevier BV
R. Soundar, Y.S. Vidya, H.C. Manjunatha, R. Munirathnam, K.N. Sasidhar, L. Seenappa, K.N. Sridhar, S. Manjunatha, and E. Krishnakanth
Elsevier BV
N. Sasidhar, Y.S. Vidya, H.C. Manjunatha, R. Soundar, R. Munirathnam, L. Seenappa, K.N. Sridhar, S. Manjunatha, and E. Krishnakanth
Elsevier BV
B.M. Chandrika, Holaly Chandrashekara Shastry Manjunatha, R. Munirathnam, K.N. Sridhar, L. Seenappa, S. Manjunatha, and A.J. Clement Lourduraj
Elsevier BV
P. S. Damodara Gupta, N. Sowmya, H. C. Manjunatha, H. S. Anushree, L. Seenappa, and K. N. Sridhar
World Scientific Pub Co Pte Ltd
In this paper, we systematically studied half-lives of the different decay modes using various theoretical models such as the unified fission model (UFM) and the effective liquid drop model. Beta-decay half-lives were evaluated using semi-empirical formulae available in the literature. We compared half-lives of all the studied decay modes and identified shorter half-lives among the same in [Formula: see text]Ac nuclei. We investigated the actinium series which is similar to the thorium series. Among these decay series, alpha-emitting isotopes show great promise for cancer treatment because of their short path length and high-energy transfer of radiation. Furthermore, we predicted the decay chains of the actinium isotopes. All the decay series of actinium ends with the formation of stable nuclei or with longer half-lives. The predicted decay series and new isotopes during the decay process are helpful in the field of medicine and radiotherapy.
Ramachandrappa Umashankara Raja, Yakekadakalu S Vidya, Holaly Chandrashekara Shastry Manjunatha, Rajachari Munirathnam, Lakshmaiah Seenappa, Krishnachari Nagarthnamma Sridhar, Koppa M Rajashekara, and Shivanna Manjunatha
Oxford University Press (OUP)
Abstract Over a century, shielding harmful electromagnetic radiations (EMR) and finding a suitable material, which can replace lead has become the major interest of researchers in this field. Herein, calcium–iron–chromium oxide nanocomposites with the different atomic ratios are synthesized using the solution combustion method. The as-obtained nanoparticles (NPs) are subjected to several structural and surface characteristics such as powder X-ray diffraction, scanning electron microscopy, elemental diffraction X-ray analysis, Fourier Transform Infrared Spectroscopy and UV–visible spectroscopy analysis were performed to confirm the successful synthesis. Furthermore, the EMR shielding of as-procured NPs is investigated and observed that the obtained NPs show good shielding properties.
Rajachari Munirathnam, Lakshmaiah Seenappa, Holaly Chandrashekara Shastry Manjunatha, Yalekadakalu Shivanna Vidya, Krishnachari Nagarthnamma Sridhar, Shivanna Manjunath, Veera Rethina Murugan, and Ningaiah Nagaiah
Oxford University Press (OUP)
Abstract Cerium oxide (CeO2) nanoparticles (NPs) exhibit a variety of properties, which have prompted researchers to explore CeO2 NPs in various applications such as biomedical, electrochemical, gas sensing and display applications. CeO2 NPs capabilities were impacted by the type of synthesis mechanism. CeO2 NPs were synthesized by solution combustion method using neem leaves extract as a reducing agent. The synthesized sample is characterized with different techniques. The Bragg reflections confirm the formation of cubic spinel structure. The surface morphology consists of agglomerated NPs. The direct energy band gap was found to be 2.9 eV. X-ray radiation absorption properties were studied within 1 keV–100GeV range. The results indicate that CeO2 NPs found to be potential in radiation applications.
Narayanappa Nagaraja, Holaly C Manjunatha, Krishnachari Nagarathnamma Sridhar, Nagarajan Sowmya, Lakshmaiah Seenappa, Rajachari Munirathnam, and Renu Soundar
Oxford University Press (OUP)
Abstract The current study proposes an empirical formula for absorption buildup factors as a function of target thickness. The present formula produces absorption buildup factors of compounds and mixtures with simple inputs of linear attenuation coefficient (μ), tenth value layer (TVL) and half value layer (HVL) of interacting target for the atomic number region 29 < Z < 92 for the energies 0.2 MeV < E < 1.5 MeV. This method is used to compute the energy absorption buildup factors using HVL and TVL.
Byra R C Reddy, Holaly C S Manjunatha, Yalekadakalu S Vidya, K N Sridhar, Lakshmaiah Seenappa, Shivanna Manjunatha, Kembthanahalli V Sathish, Rajachari Munirathnam, and Ningaiah Nagaiah
Oxford University Press (OUP)
Abstract Zinc ferrite (ZnFe2O4) nanoparticles were synthesised via solution combustion method using urea as a fuel. The synthesised samples were characterised with various techniques. The cubic structure with Fd-3 m space group is confirmed by Powder X-ray Diffraction and Bragg’s reflection. The crystallite size estimated from Scherrer’s method was found to be 40 nm. The agglomerated irregular shape and sized surface morphology was confirmed by Scanning Electron Microscopy image. The direct energy band gap determined from Wood and Tauc’s relation was found to be 5.25 eV. Using a NaI (Tl) detector and multi-channel analyser, the described sample was examined for X-ray and gamma ray shielding characteristics in the energy range of 0.081–1.332 MeV. The measured shielding values are in good agreement with the theory, however below 356 keV, there is a little variation of up to 10%. The current work offers up new possibilities for using this simple, affordable, effective and low temperature approach to create nanomaterials for X-ray and gamma ray shielding.
Rajachari Munirathnam, Lakshmaiah Seenappa, Holaly Chandrashekara Shastry Manjunatha, Yalekadakalu Shivanna Vidya, Krishnachari Nagarthnamma Sridhar, Shivanna Manjunath, Subramaniam Veera Rethina Murugan, and Ningaiah Nagaiah
Oxford University Press (OUP)
Abstract In the current study, CeO2: Ag (0 and 11 mol) nanoparticles (NPs) were synthesized by solution combustion method using Aloevera extract as reducing agent. As-obtained NPs were characterized by standard techniques. Bragg’s reflections confirm the formation of a single-phase cubic structure of CeO2:Ag NPs. Crystalline size is calculated using both the W–H plot and Scherrer’s equation. Crystallite size found to decrease with increase in the dopant concentration. EDAX pattern confirmed the presence of Ce, O and Ag. Direct energy band calculated using Wood and Tauc’s was found to be in the range of 2.9–2.2 eV for 0 and 11 mol, respectively. Fourier transformation infrared spectroscopy (FTIR) analysis confirmed the presence of the functional groups. Total shielding efficiency (SET) will give the best representation of EMI shielding properties. SET values calculated for a wide range of wavelengths are found to be as follows: near infrared (1.65 × 102 dB), mid infrared (9.78 × 101 dB) and far infrared (6.32 × 101 dB), followed by microwave region (MW) (6.46 × 101 dB), ultra-high frequency (UHF) (7.31 × 101 dB), very high frequency (VHF) (8.27 × 101 dB), high frequency (HF) (9.26 × 101 dB), medium frequency (MF) (1.02 × 102 dB), low frequency (LW) (1.12 × 102 dB), very low frequency (VLF) (1.22 × 102 dB), ultra-low frequency (ULF) (1.42 × 102 dB) and extremely low frequency (ELF) (1.52 × 102 dB). SET values of CeO2:Ag NPs are compared with other traditional materials and nanocomposites and found to be potential use in EMI shielding applications.